Linux Kernel: security vulnerability (CVE-2024-26906)
Published Last modified Sources: Siemens ProductCERT, SUSE, Debian, Red Hat, BSI, CVE.org, EUVD
What is affected, what to do
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault() When trying to use copy_from_kernel_nofault() to read vsyscall page through a bpf program, the following oops was reported: BUG: unable to handle page fault for address: ffffffffff600000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 3231067 P4D 3231067 PUD 3233067 PMD 3235067 PTE 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 20390 Comm: test_progs ...... 6.7.0+ #58 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ...... RIP: 0010:copy_from_kernel_nofault+0x6f/0x110 ......
Update Linux Kernel to version 5.10.214, Linux Kernel to version 5.15.153, Linux Kernel to version 6.1.83.
- Affected
- 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
- Fixed in
- 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
- Linux Kernel
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Metrics
5.5
XIEM Effective CVSS
Highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
0.0
CVSS v3
Severity Not rated on the scale from 0 to 10.
Source: Siemens ProductCERT, SUSE, Debian, Red Hat, BSI, CVE.org, EUVD
0.3 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 16.9
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- 7.14 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- 5.5 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- 0.0
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- 16.9
- 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: partial
- Source: CISA Vulnrichment, as of 10 September 2024
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: x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault() When trying to use copy_from_kernel_nofault() to read vsyscall page through a bpf program, the following oops was reported: BUG: unable to handle page fault for address: ffffffffff600000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 3231067 P4D 3231067 PUD 3233067 PMD 3235067 PTE 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 20390 Comm: test_progs ...... 6.7.0+ #58 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ...... RIP: 0010:copy_from_kernel_nofault+0x6f/0x110 ...... Call Trace: <TASK> ? copy_from_kernel_nofault+0x6f/0x110 bpf_probe_read_kernel+0x1d/0x50 bpf_prog_2061065e56845f08_do_probe_read+0x51/0x8d trace_call_bpf+0xc5/0x1c0 perf_call_bpf_enter.isra.0+0x69/0xb0 perf_syscall_enter+0x13e/0x200 syscall_trace_enter+0x188/0x1c0 do_syscall_64+0xb5/0xe0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK> ...... ---[ end trace 0000000000000000 ]--- The oops is triggered when: 1) A bpf program uses bpf_probe_read_kernel() to read from the vsyscall page and invokes copy_from_kernel_nofault() which in turn calls __get_user_asm(). 2) Because the vsyscall page address is not readable from kernel space, a page fault exception is triggered accordingly. 3) handle_page_fault() considers the vsyscall page address as a user space address instead of a kernel space address. This results in the fix-up setup by bpf not being applied and a page_fault_oops() is invoked due to SMAP. Considering handle_page_fault() has already considered the vsyscall page address as a userspace address, fix the problem by disallowing vsyscall page read for copy_from_kernel_nofault().
Source: siemens_advisory, suse_csaf, Debian Security Advisories, redhat_csaf, BSI CSAF, BSI WID Portal, cvelistv5, ENISA EUVD, NVD (NIST)
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 | debian_linux | 10.0 |
| Linux | debian | linux | bullseye |
| Linux | linux | linux_kernel | 6.8 |
| Linux | linux | linux_kernel | — |
References & sources
- git.kernel.orgstable/c/6e4694e65b6db4c3de125115dd4f55848cc48381euvd
- git.kernel.orgstable/c/e8a67fe34b76a49320b33032228a794f40b0316beuvd
- git.kernel.orgstable/c/f175de546a3eb77614d94d4c02550181c0a8493eeuvd
- git.kernel.orgstable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5euvd
- git.kernel.orgstable/c/29bd6f86904682adafe9affbc7f79b14defcaff8euvd
- git.kernel.orgstable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58euvd
- lists.debian.orgdebian-lts-announce/2024/06/msg00017.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/29bd6f86904682adafe9affbc7f79b14defcaff8
- https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58
- https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5
- https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381
and 2 more references
Show 18 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8Reference added —https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58Reference added —https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5Reference added —https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381Reference added —https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316bReference added —https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493eReference removed https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8—Reference removed https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58—Reference removed https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5—Reference removed https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381—Reference removed https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b—Reference removed https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e—Reference type removed https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8 Types: Patch—Reference type removed https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58 Types: Patch—Reference type removed https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5 Types: Patch—Reference type removed https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381 Types: Patch—Reference type removed https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b Types: Patch—Reference type removed https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e Types: Patch—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
New references:- https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8
- https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58
- https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5
- https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381
and 3 more references
Show 21 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8Reference added —https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58Reference added —https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5Reference added —https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381Reference added —https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316bReference added —https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493eReference added —https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlReference removed https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8—Reference removed https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58—Reference removed https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5—Reference removed https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381—Reference removed https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b—Reference removed https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e—Reference removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html—Reference type removed https://git.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8 Types: Patch—Reference type removed https://git.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58 Types: Patch—Reference type removed https://git.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5 Types: Patch—Reference type removed https://git.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381 Types: Patch—Reference type removed https://git.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316b Types: Patch—Reference type removed https://git.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493e Types: Patch—Reference type removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Types: 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-2024-26906.json">CVE-2024-26906</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-2024-26906"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-26906.svg?lang=en" alt="CVE-2024-26906 – NEOSEC Intel" height="20"></a>