Linux Kernel: Integer Overflow or Wraparound (CVE-2024-26884)
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 hashtab overflow check on 32-bit arches The hashtab 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 3.19..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
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 16.6
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- 46.05 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- 16.6
- 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 30 October 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-190
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 hashtab overflow check on 32-bit arches The hashtab 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. So apply the same fix to hashtab, by moving the overflow check to before the roundup.
Source: siemens_advisory, suse_csaf, Debian Security Advisories, 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 | linux | bullseye |
| Linux | linux | linux_kernel | — |
Weakness classes (CWE)
CWE-190Integer Overflow or Wraparound
Base
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Entry at MITRE CWE-190
References & sources
- git.kernel.orgstable/c/33ec04cadb77605b71d9298311919303d390c4d5euvd
- git.kernel.orgstable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566aceeuvd
- git.kernel.orgstable/c/64f00b4df0597590b199b62a37a165473bf658a6euvd
- git.kernel.orgstable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55deuvd
- git.kernel.orgstable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93euvd
- git.kernel.orgstable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868euvd
- git.kernel.orgstable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3eeuvd
- git.kernel.orgstable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016euvd
- git.kernel.orgstable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1euvd
- 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
CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
New references:- https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5
- https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d
- https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6
- https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1
and 5 more references
Show 28 original changes
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:HReference added —https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5Reference added —https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dReference added —https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6Reference added —https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1Reference added —https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868Reference added —https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566aceReference added —https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016Reference added —https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93Reference added —https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3eReference removed https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5—Reference removed https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d—Reference removed https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6—Reference removed https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1—Reference removed https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868—Reference removed https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace—Reference removed https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016—Reference removed https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93—Reference removed https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e—Reference type removed https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5 Types: Patch—Reference type removed https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d Types: Patch—Reference type removed https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6 Types: Patch—Reference type removed https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1 Types: Patch—Reference type removed https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868 Types: Patch—Reference type removed https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace Types: Patch—Reference type removed https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016 Types: Patch—Reference type removed https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93 Types: Patch—Reference type removed https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e Types: Patch—Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
New references:- https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5
- https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d
- https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6
- https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1
and 7 more references
Show 31 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5Reference added —https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55dReference added —https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6Reference added —https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1Reference added —https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868Reference added —https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566aceReference added —https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016Reference added —https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93Reference added —https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3eReference 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/33ec04cadb77605b71d9298311919303d390c4d5—Reference removed https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d—Reference removed https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6—Reference removed https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1—Reference removed https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868—Reference removed https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace—Reference removed https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016—Reference removed https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93—Reference removed https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e—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/33ec04cadb77605b71d9298311919303d390c4d5 Types: Patch—Reference type removed https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d Types: Patch—Reference type removed https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6 Types: Patch—Reference type removed https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1 Types: Patch—Reference type removed https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868 Types: Patch—Reference type removed https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace Types: Patch—Reference type removed https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016 Types: Patch—Reference type removed https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93 Types: Patch—Reference type removed https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e 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-2024-26884.json">CVE-2024-26884</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-2024-26884"><img src="https://intel.neosec.eu/badge/cve/CVE-2024-26884.svg?lang=en" alt="CVE-2024-26884 – NEOSEC Intel" height="20"></a>