net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6() skb_maybe_pull_tail() subtracts skb_headlen(skb) from the unsigned max argument and passes the result to __pskb_pull_tail() as a signed int. The function does not ensure that max is at least skb_headlen(skb). This can happen while parsing IPv6 extension headers when an skb already has a linear area larger than MAX_IPV6_HDR_LEN. Once the parser needs data beyond the linear area, max - skb_headlen(skb) wraps and is converted to a negative delta. __pskb_pull_tail() then passes that negative length to skb_copy_bits(), where it can become a very large copy length. Pass the requested length itself as the pull bound at the three extension-header call sites, so the delta can no longer go negative.
CVE-2026-98573
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-2026-98573
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": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "9c4e432132a97b82edf28fa172c39f743e6bfb26",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "718747afa5463d9cc5fd9a09f03b2a492edd9b78",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "a0ad0473c09d2e947aecac5c82e637ec85924b12",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "b2da5ed3d8c75e1b729a21b6d3beaed415e263f6",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "6c28c31f051dbf49c71ba7ab7bb9bc905fa1d14b",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "d7f474226809471dc7877435e9c492cc914df0bf",
"versionType": "git"
},
{
"status": "affected",
"version": "1431fb31ecbaba1b5718006128f0f2ed0b94e1c3",
"lessThan": "3b4e0b0c008a8c1b474730248cd5b873026c74bd",
"versionType": "git"
}
],
"programFiles": [
"net/core/skbuff.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"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/core/skbuff.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98573
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38593 · Revision 1
- Added to Heist Feed
- Publisher date