netfilter: nf_tables: don't queue packet path object notifications
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: don't queue packet path object notifications All file:line references below are against v7.2-rc4 (ac5b0e5651b1). The trace was captured on 7.2.0-rc6-kasan72rc6 (075b74841bd0), where the same lines apply. nft_obj_notify() is exported and reached from the packet path. Its only in-tree caller is nft_quota_obj_eval() (net/netfilter/nft_quota.c:68), which notifies with GFP_ATOMIC while evaluating a rule for a transiting packet, holding no mutex. Since commit 67cc570edaa0 ("netfilter: nf_tables: coalesce multiple notifications into one skbuff") that notification is no longer sent immediately. __nft_obj_notify() queues it onto nft_net->notify_list via nft_notify_enqueue() (net/netfilter/nf_tables_api.c:1211), which is a bare list_add_tail(). notify_list has no lock of its own (include/net/netfilter/nf_tables.h:1951), it is serialised by commit_mutex: the six other enqueue sites all run inside a netlink transaction, and the drain in nft_commit_notify() (net/netfilter/nf_tables_api.c:10746) does list_del() + kfree_skb() from nf_tables_commit() with commit_mutex held. Sending packets through a chain that references a depleted quota object therefore races an unlocked list_add_tail() against list_del() + kfree_skb() on another CPU. The WRITE_ONCE(prev->next, new) in __list_add() then stores through an sk_buff that has already been freed: BUG: KASAN: slab-use-after-free in __nft_obj_notify+0x2c5/0x2d
CVE-2026-80837
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-2026-80837
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": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "6989f298103f575a768a85e4b19d2384709237f8",
"versionType": "git"
},
{
"status": "affected",
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "df86c0e84025be8b6dd572a20852698927aa666b",
"versionType": "git"
},
{
"status": "affected",
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "6fa88d11983c6fe693c13ed7c5b3b75ae9f39de6",
"versionType": "git"
},
{
"status": "affected",
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "e97e2d6d0b150fd78be573f9fdf193f204d9334e",
"versionType": "git"
},
{
"status": "affected",
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "68de7f3a38acab355c24114f77bf00d3094ce4da",
"versionType": "git"
},
{
"status": "affected",
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "7904b94768e983bcb2be34a8d6d1f3450f5b838b",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"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/netfilter/nf_tables_api.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80837
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34853 · Revision 1
- Added to Heist Feed
- Publisher date