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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a cve-icon cve-icon
https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895 cve-icon cve-icon
https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d cve-icon cve-icon
https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0 cve-icon cve-icon
https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a cve-icon cve-icon
https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b cve-icon cve-icon
https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae cve-icon cve-icon
https://git.kernel.org/stable/c/d0e214acc59145ce25113f617311aa79dda39cb3 cve-icon cve-icon
https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html cve-icon
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html cve-icon
https://lore.kernel.org/linux-cve-announce/2024041741-CVE-2024-26883-1fc4@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-26883 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-26883 cve-icon
History

Fri, 22 Nov 2024 12:00:00 +0000

Type Values Removed Values Added
References

Wed, 06 Nov 2024 20:15:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 12 Sep 2024 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 11 Sep 2024 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2024-12-19T08:49:26.752Z

Reserved: 2024-02-19T14:20:24.185Z

Link: CVE-2024-26883

cve-icon Vulnrichment

Updated: 2024-08-02T00:21:05.381Z

cve-icon NVD

Status : Modified

Published: 2024-04-17T11:15:10.113

Modified: 2024-11-21T09:03:17.527

Link: CVE-2024-26883

cve-icon Redhat

Severity : Low

Publid Date: 2024-04-17T00:00:00Z

Links: CVE-2024-26883 - Bugzilla