Linux Kernel: security vulnerability (CVE-2024-26883)
Published Last modified Sources: Siemens ProductCERT, SUSE, Debian, BSI, EUVD, CVE.org
What is affected, what to do
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code.
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 4.19.177..4.19.311 - Linux Kernel
lt 5.4.99..5.4.273 - Linux Kernel
lt 5.10.17..5.10.214 - Linux Kernel
lt 4.9.258..4.10 - Linux Kernel
lt 4.14.222..4.15 - 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
4.10 - Linux Kernel
4.15 - 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
7.8
XIEM Effective CVSS
Highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
7.8
CVSS v3
Severity High on the scale from 0 to 10.
Source: Siemens ProductCERT, SUSE, Debian, BSI, EUVD, CVE.org
0.3 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 16.9
Show all metrics
- Severity
- High
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- 46.14 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- 7.8 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- 7.8
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- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
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: bpf: Fix stackmap overflow check on 32-bit arches The stackmap code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. The commit in the fixes tag actually attempted to fix this, but the fix did not account for the UB, so the fix only works on CPUs where an overflow does result in a neat truncation to zero, which is not guaranteed. Checking the value before rounding does not have this problem.
Source: siemens_advisory, suse_csaf, Debian Security Advisories, BSI CSAF, BSI WID Portal, ENISA EUVD, cvelistv5, 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 | — |
References & sources
- git.kernel.orgstable/c/d0e214acc59145ce25113f617311aa79dda39cb3euvd
- git.kernel.orgstable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1deuvd
- git.kernel.orgstable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895euvd
- git.kernel.orgstable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46aeeuvd
- git.kernel.orgstable/c/f06899582ccee09bd85d0696290e3eaca9aa042deuvd
- git.kernel.orgstable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33aeuvd
- git.kernel.orgstable/c/43f798b9036491fb014b55dd61c4c5c3193267d0euvd
- git.kernel.orgstable/c/0971126c8164abe2004b8536b49690a0d6005b0aeuvd
- git.kernel.orgstable/c/7a4b21250bf79eef26543d35bd390448646c536beuvd
- 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/0971126c8164abe2004b8536b49690a0d6005b0a
- https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895
- https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d
- https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0
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/0971126c8164abe2004b8536b49690a0d6005b0aReference added —https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895Reference added —https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1dReference added —https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0Reference added —https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33aReference added —https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536bReference added —https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46aeReference added —https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3Reference added —https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042dReference removed https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a—Reference removed https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895—Reference removed https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d—Reference removed https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0—Reference removed https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a—Reference removed https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b—Reference removed https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae—Reference removed https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3—Reference removed https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d—Reference type removed https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a Types: Patch—Reference type removed https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895 Types: Patch—Reference type removed https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d Types: Patch—Reference type removed https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0 Types: Patch—Reference type removed https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a Types: Patch—Reference type removed https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b Types: Patch—Reference type removed https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae Types: Patch—Reference type removed https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3 Types: Patch—Reference type removed https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d Types: Patch—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
New references:- https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a
- https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895
- https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d
- https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0
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/0971126c8164abe2004b8536b49690a0d6005b0aReference added —https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895Reference added —https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1dReference added —https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0Reference added —https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33aReference added —https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536bReference added —https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46aeReference added —https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3Reference added —https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042dReference 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/0971126c8164abe2004b8536b49690a0d6005b0a—Reference removed https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895—Reference removed https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d—Reference removed https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0—Reference removed https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a—Reference removed https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b—Reference removed https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae—Reference removed https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3—Reference removed https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d—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/0971126c8164abe2004b8536b49690a0d6005b0a Types: Patch—Reference type removed https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895 Types: Patch—Reference type removed https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d Types: Patch—Reference type removed https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0 Types: Patch—Reference type removed https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a Types: Patch—Reference type removed https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b Types: Patch—Reference type removed https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae Types: Patch—Reference type removed https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3 Types: Patch—Reference type removed https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d Types: Patch—Reference type removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Types: Mailing List—Reference type removed https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html Types: Mailing List—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-2024-26883.json">CVE-2024-26883</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
Record modifiedLinux
CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Show the original change
Individual changes of this event as published by NVD Type Action Before After CVSS added —AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSource identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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<a href="https://intel.neosec.eu/en/cve/CVE-2024-26883"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-26883.svg?lang=en" alt="CVE-2024-26883 – NEOSEC Intel" height="20"></a>