Linux Kernel: Use After Free (CVE-2024-26875)
Published Last modified Sources: Siemens ProductCERT, SUSE, Debian, BSI, CVE.org, EUVD
What is affected, what to do
In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix uaf in pvr2_context_set_notify [Syzbot reported] BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35 Read of size 4 at addr ffff888113aeb0d8 by task kworker/1:1/26 CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 6.8.0-rc1-syzkaller-00046-gf1a27f081c1f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35 pvr2_context_notify drivers/media/usb/pvrusb2/pvrusb2-context.c:95 [inline] pvr2_context_disconnect+0x94/0xb0 drivers/media/usb/pvrusb2/pvrusb2-context.c:272 Freed by task 906: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x106/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x105/0x340 mm/slub.c:4409 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline] pvr2_context_thread_func+0x69d/0x960 drivers/media/usb/pvrusb2/pvrusb2-context.c:158 [Analyze] Task A set disconnect_flag = !0, which resulted in Task B's condition being met and releasing mp, leading to this issue. [Fix] Place the disconnect_flag assignment operation after all code in pvr2_context_disconnect() to avoid this issue.
Update Linux Kernel to version 4.19.311, Linux Kernel to version 5.4.273, Linux Kernel to version 5.10.214.
- Affected
- Linux Kernel
lt 2.6.26..4.19.311 - Linux Kernel
lt 4.20..5.4.273 - Linux Kernel
lt 5.5..5.10.214 - Linux Kernel
lt 5.11..5.15.153 - Linux Kernel
lt 5.16..6.1.83 - Linux Kernel
lt 6.2..6.6.23 - Linux Kernel
lt 6.7..6.7.11 - Linux Kernel
lt 6.8..6.8.2
- Linux Kernel
- Fixed in
- Linux Kernel
4.19.311 - Linux Kernel
5.4.273 - Linux Kernel
5.10.214 - Linux Kernel
5.15.153 - Linux Kernel
6.1.83 - Linux Kernel
6.6.23 - Linux Kernel
6.7.11 - Linux Kernel
6.8.2 - Linux Kernel
6.9
- Linux Kernel
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Metrics
6.4
XIEM Effective CVSS
Highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
6.4
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: Siemens ProductCERT, SUSE, Debian, BSI, CVE.org, EUVD
0.3 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 16.1
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 38.93 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 6.4 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 6.4
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.3 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 16.1
- Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
- CISA assessment (SSVC)
- Exploitation: none known · not automatable · Technical impact: total
- Source: CISA Vulnrichment, as of 8 August 2024
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-416
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
In the Linux kernel, the following vulnerability has been resolved: media: pvrusb2: fix uaf in pvr2_context_set_notify [Syzbot reported] BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35 Read of size 4 at addr ffff888113aeb0d8 by task kworker/1:1/26 CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 6.8.0-rc1-syzkaller-00046-gf1a27f081c1f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: usb_hub_wq hub_event Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35 pvr2_context_notify drivers/media/usb/pvrusb2/pvrusb2-context.c:95 [inline] pvr2_context_disconnect+0x94/0xb0 drivers/media/usb/pvrusb2/pvrusb2-context.c:272 Freed by task 906: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x106/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x105/0x340 mm/slub.c:4409 pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline] pvr2_context_thread_func+0x69d/0x960 drivers/media/usb/pvrusb2/pvrusb2-context.c:158 [Analyze] Task A set disconnect_flag = !0, which resulted in Task B's condition being met and releasing mp, leading to this issue. [Fix] Place the disconnect_flag assignment operation after all code in pvr2_context_disconnect() to avoid this issue.
Source: siemens_advisory, suse_csaf, Debian Security Advisories, BSI CSAF, BSI WID Portal, cvelistv5, NVD (NIST), ENISA EUVD
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Linux | Linux |
|
|
Vendors and products
Affected operating systems
| Linux | debian | linux | bullseye |
| Linux | linux | linux_kernel | — |
Weakness classes (CWE)
CWE-416Use After Free
Variant
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Entry at MITRE CWE-416
References & sources
- git.kernel.orgstable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929ceuvd
- git.kernel.orgstable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fbeuvd
- git.kernel.orgstable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209feuvd
- git.kernel.orgstable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7euvd
- git.kernel.orgstable/c/3a1ec89708d2e57e2712f46241282961b1a7a475euvd
- git.kernel.orgstable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592euvd
- git.kernel.orgstable/c/40cd818fae875c424a8335009db33c7b5a07de3aeuvd
- git.kernel.orgstable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16euvd
- git.kernel.orgstable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01eeeuvd
- lists.debian.orgdebian-lts-announce/2024/06/msg00017.htmlx_transferred
- lists.debian.orgdebian-lts-announce/2024/06/msg00020.htmlx_transferred
- Siemens ProductCERTproductcert/html/ssa-265688.html
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedLinux
New references:- https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee
- https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475
- https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a
- https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592
and 5 more references
Show 27 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01eeReference added —https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475Reference added —https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3aReference added —https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592Reference added —https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209fReference added —https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fbReference added —https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16Reference added —https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7Reference added —https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929cReference removed https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee—Reference removed https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475—Reference removed https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a—Reference removed https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592—Reference removed https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209f—Reference removed https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fb—Reference removed https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16—Reference removed https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7—Reference removed https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929c—Reference type removed https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee Types: Patch—Reference type removed https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475 Types: Patch—Reference type removed https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a Types: Patch—Reference type removed https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592 Types: Patch—Reference type removed https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209f Types: Patch—Reference type removed https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fb Types: Patch—Reference type removed https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16 Types: Patch—Reference type removed https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7 Types: Patch—Reference type removed https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929c Types: Patch—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
New references:- https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee
- https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475
- https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a
- https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592
and 7 more references
Show 33 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01eeReference added —https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475Reference added —https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3aReference added —https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592Reference added —https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209fReference added —https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fbReference added —https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16Reference added —https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7Reference added —https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929cReference added —https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlReference added —https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlReference removed https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee—Reference removed https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475—Reference removed https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a—Reference removed https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592—Reference removed https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209f—Reference removed https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fb—Reference removed https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16—Reference removed https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7—Reference removed https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929c—Reference removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html—Reference removed https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html—Reference type removed https://git.kernel.org/stable/c/0a0b79ea55de8514e1750884e5fec77f9fdd01ee Types: Patch—Reference type removed https://git.kernel.org/stable/c/3a1ec89708d2e57e2712f46241282961b1a7a475 Types: Patch—Reference type removed https://git.kernel.org/stable/c/40cd818fae875c424a8335009db33c7b5a07de3a Types: Patch—Reference type removed https://git.kernel.org/stable/c/8e60b99f6b7ccb3badeb512f5eb613ad45904592 Types: Patch—Reference type removed https://git.kernel.org/stable/c/ab896d93fd6a2cd1afeb034c3cc9226cb499209f Types: Patch—Reference type removed https://git.kernel.org/stable/c/d29ed08964cec8b9729bc55c7bb23f679d7a18fb Types: Patch—Reference type removed https://git.kernel.org/stable/c/eaa410e05bdf562c90b23cdf2d9327f9c4625e16 Types: Patch—Reference type removed https://git.kernel.org/stable/c/eb6e9dce979c08210ff7249e5e0eceb8991bfcd7 Types: Patch—Reference type removed https://git.kernel.org/stable/c/ed8000e1e8e9684ab6c30cf2b526c0cea039929c Types: Patch—Reference type removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Types: Mailing List, Third Party Advisory—Reference type removed https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html Types: Mailing List, Third Party Advisory—Source identifier: af854a3a-2127-422b-91ae-364da2661108
Record modifiedSiemens ADP
Show 3 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2024/26xxx/CVE-2024-26875.json">CVE-2024-26875</a>Reference added —https://cert-portal.siemens.com/productcert/html/ssa-265688.htmlReference removed https://cert-portal.siemens.com/productcert/html/ssa-265688.html—Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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<a href="https://intel.neosec.eu/en/cve/CVE-2024-26875"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-26875.svg?lang=en" alt="CVE-2024-26875 – NEOSEC Intel" height="20"></a>