xfrm: drop ESP-in-TCP packets with no ingress device
In the Linux kernel, the following vulnerability has been resolved: xfrm: drop ESP-in-TCP packets with no ingress device ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path. Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device. Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.
CVE-2026-80846
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-2026-80846
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": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "239d0f71af09dc2029fd4d730cb24b8c83aaa43a",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "f00235f9d12301183d61f75fbe4105506f3e5140",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "6af5cdb03819a5ce6e945992635c6c5e91045367",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "2dd1609cadff46c4b20ce53b91ab9cce1380456a",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "c296d25efbc840be24de83f56d43bc47e714ace9",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "328e40aa774b446969c69b654c52a051a95af8a1",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "7911e0236616487b89db6bd3ba3f408abd10eb23",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "943d95233b8b4a88994e244fcf466f8c403d63f1",
"versionType": "git"
},
{
"status": "affected",
"version": "e27cca96cd68fa2c6814c90f9a1cfd36bb68c593",
"lessThan": "e1d7c5ac1c246ce5775f604515de0a59fbf2116e",
"versionType": "git"
}
],
"programFiles": [
"net/xfrm/espintcp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.269",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.156",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/espintcp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80846
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34862 · Revision 1
- Added to Heist Feed
- Publisher date