netfilter: nft_inner: Fix IPv6 inner_thoff desync
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: Fix IPv6 inner_thoff desync In nft_inner_parse_l2l3(), when processing inner IPv6 packets, ipv6_find_hdr() correctly computes the transport header offset traversing all extension headers, but the result is immediately overwritten with nhoff + sizeof(_ip6h) (40 bytes), which only accounts for the IPv6 base header. This creates a desync between inner_thoff (wrong — points to extension header start) and l4proto (correct — e.g., IPPROTO_TCP), enabling transport header forgery and potential firewall bypass. This issue affects stable versions from Linux 6.2. For comparison, the normal (non-inner) IPv6 path correctly preserves ipv6_find_hdr()'s result. Removing the incorrect overwrite ensures that ipv6_find_hdr()'s calculated transport header offset is preserved, thereby fixing the desynchronization.
CVE-2026-46244
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-2026-46244
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": "3a07327d10a09379315c844c63f27941f5081e0a",
"lessThan": "c161ad9157f5a0429b5ff94d9770faf3bf48d273",
"versionType": "git"
},
{
"status": "affected",
"version": "3a07327d10a09379315c844c63f27941f5081e0a",
"lessThan": "870d59e2cf218e7418491e26bad768cb16654582",
"versionType": "git"
},
{
"status": "affected",
"version": "3a07327d10a09379315c844c63f27941f5081e0a",
"lessThan": "689bbf48c1f45130086ae1c46ab83ea4c753c601",
"versionType": "git"
},
{
"status": "affected",
"version": "3a07327d10a09379315c844c63f27941f5081e0a",
"lessThan": "d0f98a3617f6ae5b1e95cde1e68e7ead4a1279ce",
"versionType": "git"
},
{
"status": "affected",
"version": "3a07327d10a09379315c844c63f27941f5081e0a",
"lessThan": "b6a91f68ebfed9c38e0e9150f58a9b85da07181c",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nft_inner.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nft_inner.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46244
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40162 · Revision 1
- Added to Heist Feed
- Publisher date