Linux Kernel: security vulnerability (CVE-2024-26885)
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: bpf: Fix DEVMAP_HASH overflow check on 32-bit arches The devmap code allocates a number hash buckets equal to the next power of two of the max_entries value provided when creating the map. When rounding up to the next power of two, the 32-bit variable storing the number of buckets can overflow, and the code checks for overflow by checking if the truncated 32-bit value is equal to 0. However, on 32-bit arches the rounding up itself can overflow mid-way through, because it ends up doing a left-shift of 32 bits on an unsigned long value.
Update Linux Kernel to version 5.4.285, Linux Kernel to version 5.10.227, Linux Kernel to version 5.15.153.
- Affected
- Linux Kernel
lt 5.4..5.4.285 - Linux Kernel
lt 5.5..5.10.227 - 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
5.4.285 - Linux Kernel
5.10.227 - 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
Not sure whether and how you are affected? Ask a question about this vulnerability
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, CVE.org, EUVD
0.3 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 16.5
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- 46.02 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- 16.5
- 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 28 May 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 DEVMAP_HASH overflow check on 32-bit arches The devmap code allocates a number hash buckets equal to the next power of two of the max_entries value provided when creating the map. When rounding up to the next power of two, the 32-bit variable storing the number of buckets can overflow, and the code checks for overflow by checking if the truncated 32-bit value is equal to 0. However, on 32-bit arches the rounding up itself can overflow mid-way through, because it ends up doing a left-shift of 32 bits on an unsigned long value. If the size of an unsigned long is four bytes, this is undefined behaviour, so there is no guarantee that we'll end up with a nice and tidy 0-value at the end. Syzbot managed to turn this into a crash on arm32 by creating a DEVMAP_HASH with max_entries > 0x80000000 and then trying to update it. Fix this by moving the overflow check to before the rounding up operation.
Source: siemens_advisory, suse_csaf, Debian Security Advisories, BSI CSAF, BSI WID Portal, NVD (NIST), ENISA EUVD, cvelistv5
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 | — |
References & sources
- git.kernel.orgstable/c/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65euvd
- git.kernel.orgstable/c/4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9euvd
- git.kernel.orgstable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3euvd
- git.kernel.orgstable/c/edf7990baa48de5097daa9ac02e06cb4c798a737euvd
- git.kernel.orgstable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691euvd
- git.kernel.orgstable/c/22079b3a423382335f47d9ed32114e6c9fe88d7ceuvd
- git.kernel.orgstable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52ceuvd
- git.kernel.orgstable/c/281d464a34f540de166cee74b723e97ac2515ec3euvd
- git.kernel.orgstable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fbx_transferred
- 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/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65
- https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c
- https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691
- https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3
and 4 more references
Show 22 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65Reference added —https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7cReference added —https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691Reference added —https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3Reference added —https://git.kernel.org/stable/c/4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9Reference added —https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3Reference added —https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52cReference added —https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737Reference removed https://git.kernel.org/stable/c/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65—Reference removed https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c—Reference removed https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691—Reference removed https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3—Reference removed https://git.kernel.org/stable/c/4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9—Reference removed https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3—Reference removed https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c—Reference removed https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737—Reference type removed https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c Types: Patch—Reference type removed https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691 Types: Patch—Reference type removed https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3 Types: Patch—Reference type removed https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3 Types: Patch—Reference type removed https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c Types: Patch—Reference type removed https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737 Types: Patch—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
New references:- https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c
- https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fb
- https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691
- https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3
and 4 more references
Show 23 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7cReference added —https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fbReference added —https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691Reference added —https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3Reference added —https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3Reference added —https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52cReference added —https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737Reference added —https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlReference removed https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c—Reference removed https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fb—Reference removed https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691—Reference removed https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3—Reference removed https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3—Reference removed https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c—Reference removed https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737—Reference removed https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html—Reference type removed https://git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c Types: Patch—Reference type removed https://git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fb Types: Patch—Reference type removed https://git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691 Types: Patch—Reference type removed https://git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3 Types: Patch—Reference type removed https://git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3 Types: Patch—Reference type removed https://git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c Types: Patch—Reference type removed https://git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737 Types: Patch—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-2024-26885.json">CVE-2024-26885</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
Embed badge
Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.
<a href="https://intel.neosec.eu/en/cve/CVE-2024-26885"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-26885.svg?lang=en" alt="CVE-2024-26885 – NEOSEC Intel" height="20"></a>