net/sched: cls_u32: use skb_header_pointer_careful()
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221
CVE-2026-23204
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-2026-23204
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": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "66e4b63d61c15de6ca5332d9ca6db59a404d7136",
"versionType": "git"
},
{
"status": "affected",
"version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "29681ed51e737be14d18ecd1c304c57002e4b72c",
"versionType": "git"
},
{
"status": "affected",
"version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "cfa745830e45ecb75c061aa34330ee0cac941cc7",
"versionType": "git"
},
{
"status": "affected",
"version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "13336a6239b9d7c6e61483017bb8bdfe3ceb10a5",
"versionType": "git"
},
{
"status": "affected",
"version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "e41a23e61259f5526af875c3b86b3d42a9bae0e5",
"versionType": "git"
},
{
"status": "affected",
"version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "8a672f177ebe19c93d795fbe967846084fbc7943",
"versionType": "git"
},
{
"status": "affected",
"version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
"lessThan": "cabd1a976375780dabab888784e356f574bbaed8",
"versionType": "git"
}
],
"programFiles": [
"net/sched/cls_u32.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.35"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.35",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.124",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.70",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.10",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/cls_u32.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23204
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39817 · Revision 1
- Added to Heist Feed
- Publisher date