xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete
In the Linux kernel, the following vulnerability has been resolved: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete KASAN reproduces a slab-use-after-free in __xfrm_state_delete()'s hlist_del_rcu calls under syzkaller load on linux-6.12.y stable (reproduced on 6.12.47, also reachable via the same code path on torvalds/master and on the ipsec tree). Nine unique signatures cluster in the xfrm_state lifecycle, the load-bearing one being: BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:990 [inline] BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:516 [inline] BUG: KASAN: slab-use-after-free in __xfrm_state_delete net/xfrm/xfrm_state.c Write of size 8 at addr ffff8881198bcb70 by task kworker/u8:9/435 Workqueue: netns cleanup_net Call Trace: __hlist_del / hlist_del_rcu __xfrm_state_delete xfrm_state_delete xfrm_state_flush xfrm_state_fini ops_exit_list cleanup_net The other observed signatures hit the same slab object from __xfrm_state_lookup, xfrm_alloc_spi, __xfrm_state_insert and an OOB write variant of __xfrm_state_delete, all on the byseq/byspi hash chains. __xfrm_state_delete() guards its byseq and byspi unhashes with value-based predicates: if (x->km.seq) hlist_del_rcu(&x->byseq); if (x->id.spi) hlist_del_rcu(&x->byspi); while everywhere else in the file (e.g. state_cache, state_cache_input) the safer hlist_unhashed() check is used. xfrm_alloc_spi() sets x->id.spi = newspi inside xfrm_state_lock and then immediatel
CVE-2026-46116
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-2026-46116
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": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "6b4dc3181b4bfc5f5fc33ab33b1dc6e15759f4b6",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "3943fcad7694a7d0b15aeabe7d3cc2a2eb8e92e8",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "2c617848ae6e4f07a3e397f604208c293bbecacc",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "b4a53add2fa8f1b5aa17d4c5686c320785fab182",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "26edb0a3c99f9d958c212be68b21f1221614dcf0",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "4980162de555cb838f1a189ce7d2cbf5d2e7b050",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "a2e2d08fb070fab4947447171f1c4e3ca5a188e5",
"versionType": "git"
},
{
"status": "affected",
"version": "7b4dc3600e4877178ba94c7fbf7e520421378aa6",
"lessThan": "14acf9652e5690de3c7486c6db5fb8dafd0a32a3",
"versionType": "git"
}
],
"programFiles": [
"net/xfrm/xfrm_state.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.88",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.30",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.7",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/xfrm/xfrm_state.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46116
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40122 · Revision 1
- Added to Heist Feed
- Publisher date