bpf: Fix stackmap overflow check on 32-bit arches
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.
CVE-2024-26883
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-26883
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "063c722dd9d285d877e6fd499e753d6224f4c046",
"lessThan": "d0e214acc59145ce25113f617311aa79dda39cb3",
"versionType": "git"
},
{
"status": "affected",
"version": "7e3a6b820535eb395784060ae26c5af579528fa0",
"lessThan": "21e5fa4688e1a4d3db6b72216231b24232f75c1d",
"versionType": "git"
},
{
"status": "affected",
"version": "8032bf2af9ce26b3a362b9711d15f626ab946a74",
"lessThan": "15641007df0f0d35fa28742b25c2a7db9dcd6895",
"versionType": "git"
},
{
"status": "affected",
"version": "6183f4d3a0a2ad230511987c6c362ca43ec0055f",
"lessThan": "ca1f06e72dec41ae4f76e7b1a8a97265447b46ae",
"versionType": "git"
},
{
"status": "affected",
"version": "6183f4d3a0a2ad230511987c6c362ca43ec0055f",
"lessThan": "f06899582ccee09bd85d0696290e3eaca9aa042d",
"versionType": "git"
},
{
"status": "affected",
"version": "6183f4d3a0a2ad230511987c6c362ca43ec0055f",
"lessThan": "7070b274c7866a4c5036f8d54fcaf315c64ac33a",
"versionType": "git"
},
{
"status": "affected",
"version": "6183f4d3a0a2ad230511987c6c362ca43ec0055f",
"lessThan": "43f798b9036491fb014b55dd61c4c5c3193267d0",
"versionType": "git"
},
{
"status": "affected",
"version": "6183f4d3a0a2ad230511987c6c362ca43ec0055f",
"lessThan": "0971126c8164abe2004b8536b49690a0d6005b0a",
"versionType": "git"
},
{
"status": "affected",
"version": "6183f4d3a0a2ad230511987c6c362ca43ec0055f",
"lessThan": "7a4b21250bf79eef26543d35bd390448646c536b",
"versionType": "git"
},
{
"status": "affected",
"version": "253150830a012adfccf90afcebae8fda5b05a80f",
"versionType": "git"
},
{
"status": "affected",
"version": "766107351731ae223ebf60ca22bdfeb47ce6acc8",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.177",
"lessThan": "4.19.311",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.99",
"lessThan": "5.4.273",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.17",
"lessThan": "5.10.214",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.9.258",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.14.222",
"lessThan": "4.15",
"versionType": "semver"
}
],
"programFiles": [
"kernel/bpf/stackmap.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.19.311",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.273",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.214",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.153",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.83",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.23",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.7.11",
"versionType": "semver",
"lessThanOrEqual": "6.7.*"
},
{
"status": "unaffected",
"version": "6.8.2",
"versionType": "semver",
"lessThanOrEqual": "6.8.*"
},
{
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/bpf/stackmap.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-26883
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26445 · Revision 1
- Added to Heist Feed
- Publisher date