CVE-2024-26883

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Source
https://cve.org/CVERecord?id=CVE-2024-26883
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26883.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2024-26883
Downstream
Related
Published
2024-04-17T10:27:39.036Z
Modified
2026-03-23T05:08:31.557703194Z
Summary
bpf: Fix stackmap overflow check on 32-bit arches
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix stackmap overflow check on 32-bit arches

The stackmap code relies on rounduppowoftwo() 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 DEVMAPHASH 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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26883.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
063c722dd9d285d877e6fd499e753d6224f4c046
Fixed
d0e214acc59145ce25113f617311aa79dda39cb3
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
7e3a6b820535eb395784060ae26c5af579528fa0
Fixed
21e5fa4688e1a4d3db6b72216231b24232f75c1d
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
8032bf2af9ce26b3a362b9711d15f626ab946a74
Fixed
15641007df0f0d35fa28742b25c2a7db9dcd6895
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
6183f4d3a0a2ad230511987c6c362ca43ec0055f
Fixed
ca1f06e72dec41ae4f76e7b1a8a97265447b46ae
Fixed
f06899582ccee09bd85d0696290e3eaca9aa042d
Fixed
7070b274c7866a4c5036f8d54fcaf315c64ac33a
Fixed
43f798b9036491fb014b55dd61c4c5c3193267d0
Fixed
0971126c8164abe2004b8536b49690a0d6005b0a
Fixed
7a4b21250bf79eef26543d35bd390448646c536b
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
253150830a012adfccf90afcebae8fda5b05a80f
Last affected
766107351731ae223ebf60ca22bdfeb47ce6acc8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26883.json"