bpf: Fix hashtab overflow check on 32-bit arches
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.
CVE-2024-26884
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-2024-26884
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": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "33ec04cadb77605b71d9298311919303d390c4d5",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "92c81fbb3ed2e0dfc33a4183a67135e1ab566ace",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "64f00b4df0597590b199b62a37a165473bf658a6",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "3b08cfc65f07b1132c1979d73f014ae6e04de55d",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "a83fdaeaea3677b83a53f72ace2d73a19bcd6d93",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "8435f0961bf3dc65e204094349bd9aeaac1f8868",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "d817f0d34d927f2deb17dadbfe212c9a6a32ac3e",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "a6fa75b5096c0f9826a4fabe22d907b0a5bb1016",
"versionType": "git"
},
{
"status": "affected",
"version": "daaf427c6ab392bedcd018e326b2ffa1e1110cd6",
"lessThan": "6787d916c2cf9850c97a0a3f73e08c43e7d973b1",
"versionType": "git"
}
],
"programFiles": [
"kernel/bpf/hashtab.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.19",
"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/hashtab.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-26884
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26446 · Revision 1
- Added to Heist Feed
- Publisher date