xsk: Use a 32-bit compare in xsk_map_gen_lookup
In the Linux kernel, the following vulnerability has been resolved: xsk: Use a 32-bit compare in xsk_map_gen_lookup xsk_map_gen_lookup() loads a u32 key and compares it with max_entries using BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a max_entries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key. An out-of-range index then skips the bounds check and the generated lookup reads past xsk_map[]. Compare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.
CVE-2026-98631
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-2026-98631
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": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "c6d5c582d55a8f229d75e98d62eaa065b0deb18d",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "227ec890559e922e235eb543646e3bf0bd8269b0",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "11d9be35c1f4233798e99be98bc474f83a254c6c",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "123f90f394ca404ab8796a7c8072ff7fa5b65a9c",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "36461e58f88a1b723f86693f437ac12e60ff4363",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "b5c0cff0c5331582ab01c4c423731453a8381acc",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24",
"versionType": "git"
},
{
"status": "affected",
"version": "e65650f291ee72fc578d6346080fc4699204ef2c",
"lessThan": "70504de0bb627848667207bec7ccfd647deb8814",
"versionType": "git"
}
],
"programFiles": [
"net/xdp/xskmap.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xdp/xskmap.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98631
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38651 · Revision 1
- Added to Heist Feed
- Publisher date