xfrm: fix stale skb->prev after async crypto steals a GSO segment
In the Linux kernel, the following vulnerability has been resolved: xfrm: fix stale skb->prev after async crypto steals a GSO segment skb_gso_segment() leaves the segment list head with ->prev pointing at the last segment, an invariant validate_xmit_skb_list() relies on when it sets its tail pointer (tail = skb->prev). When validate_xmit_xfrm() walks a GSO list and some segments are stolen by async crypto (->xmit() returns -EINPROGRESS), those segments are unlinked from the list but the head ->prev is never updated. If the last segment is the one stolen, the returned head still has ->prev pointing at it, even though it is now owned by the crypto engine and may be freed. validate_xmit_skb_list() later does tail->next = skb, writing through that stale pointer -- a use-after-free. Repoint skb->prev at the last retained segment before returning.
CVE-2026-68426
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-2026-68426
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": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
"lessThan": "4927ab8a8acc8db4fad33e803d1d35e0b16cef83",
"versionType": "git"
},
{
"status": "affected",
"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
"lessThan": "b58731e0570bfd3989999fc2baf9ee4fecd5bec6",
"versionType": "git"
},
{
"status": "affected",
"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
"lessThan": "33e1b0d25ca0d2818c635ff80e6aa0d295e08a98",
"versionType": "git"
},
{
"status": "affected",
"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
"lessThan": "bbca7cc3b2b4b10afbfee99b81d9ee78f5423046",
"versionType": "git"
},
{
"status": "affected",
"version": "f53c723902d1ac5f0b0a11d7c9dcbff748dde74e",
"lessThan": "3f4c3919baf0944ad96580467c302bc6c7758b00",
"versionType": "git"
}
],
"programFiles": [
"net/xfrm/xfrm_device.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/xfrm_device.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68426
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #46479 · Revision 1
- Added to Heist Feed
- Publisher date