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vuln-cve/data/2026/80xxx/CVE-2026-80837.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-80837",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.796Z",
"datePublished": "2026-09-04T15:54:47.179Z",
"dateUpdated": "2026-10-30T12:31:10.733Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:31:10.733Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: don't queue packet path object notifications\n\nAll file:line references below are against v7.2-rc4 (ac5b0e5651b1). The\ntrace was captured on 7.2.0-rc6-kasan72rc6 (075b74841bd0), where the same\nlines apply.\n\nnft_obj_notify() is exported and reached from the packet path. Its only\nin-tree caller is nft_quota_obj_eval() (net/netfilter/nft_quota.c:68),\nwhich notifies with GFP_ATOMIC while evaluating a rule for a transiting\npacket, holding no mutex.\n\nSince commit 67cc570edaa0 (\"netfilter: nf_tables: coalesce multiple\nnotifications into one skbuff\") that notification is no longer sent\nimmediately. __nft_obj_notify() queues it onto nft_net->notify_list via\nnft_notify_enqueue() (net/netfilter/nf_tables_api.c:1211), which is a bare\nlist_add_tail(). notify_list has no lock of its own\n(include/net/netfilter/nf_tables.h:1951), it is serialised by commit_mutex:\nthe six other enqueue sites all run inside a netlink transaction, and the\ndrain in nft_commit_notify() (net/netfilter/nf_tables_api.c:10746) does\nlist_del() + kfree_skb() from nf_tables_commit() with commit_mutex held.\n\nSending packets through a chain that references a depleted quota object\ntherefore races an unlocked list_add_tail() against list_del() +\nkfree_skb() on another CPU. The WRITE_ONCE(prev->next, new) in __list_add()\nthen stores through an sk_buff that has already been freed:\n\n BUG: KASAN: slab-use-after-free in __nft_obj_notify+0x2c5/0x2d0\n Write of size 8 at addr ff110001047183c0 by task poc/76\n CPU: 0 UID: 1000 PID: 76 Comm: poc Tainted: G W 7.2.0-rc6-kasan72rc6 #4\n Call Trace:\n <IRQ>\n __nft_obj_notify (include/linux/list.h:164 include/linux/list.h:191\n net/netfilter/nf_tables_api.c:1211\n net/netfilter/nf_tables_api.c:8743)\n nft_quota_obj_eval (net/netfilter/nft_quota.c:68)\n nft_do_chain_inet\n nf_hook_slow\n __ip_local_out\n ip_push_pending_frames\n udp_send_skb\n udp_sendmsg\n __x64_sys_sendto\n\n Allocated by task 77:\n __alloc_skb (net/core/skbuff.c:704)\n __nft_obj_notify (include/net/netlink.h:1055\n net/netfilter/nf_tables_api.c:8731)\n nft_quota_obj_eval (net/netfilter/nft_quota.c:68)\n nft_do_chain\n\n Freed by task 79:\n nf_tables_commit (include/linux/skbuff.h:1332\n net/netfilter/nf_tables_api.c:10759\n net/netfilter/nf_tables_api.c:11185)\n nfnetlink_rcv_batch (net/netfilter/nfnetlink.c:574)\n netlink_unicast\n netlink_sendmsg\n\n The buggy address belongs to the cache skbuff_head_cache of size 232\n\nQueueing from the packet path is wrong even leaving the race aside:\nnotify_list is only drained by nft_commit_notify() from nf_tables_commit()\n(:11185), so a notification enqueued outside a transaction is not sent\nuntil some later netlink batch commits, if one ever does.\n\nThe gfp argument that nft_obj_notify() still takes is a leftover of the\npre-67cc570edaa0 behaviour, where this path called nfnetlink_send()\ndirectly. Restore that: split the message construction out into\nnft_obj_notify_alloc() and let each caller decide what to do with the skb.\nnft_obj_notify(), the exported one reached from the packet path, sends it\nstraight away; nf_tables_obj_notify(), which runs under commit_mutex, keeps\nqueueing it, so transaction notifications are still coalesced."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"versions": [
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "f010756ed75ac003146a1cbc93501092343bb3a3",
"status": "affected",
"versionType": "git"
},
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "6989f298103f575a768a85e4b19d2384709237f8",
"status": "affected",
"versionType": "git"
},
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "df86c0e84025be8b6dd572a20852698927aa666b",
"status": "affected",
"versionType": "git"
},
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "6fa88d11983c6fe693c13ed7c5b3b75ae9f39de6",
"status": "affected",
"versionType": "git"
},
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "e97e2d6d0b150fd78be573f9fdf193f204d9334e",
"status": "affected",
"versionType": "git"
},
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "68de7f3a38acab355c24114f77bf00d3094ce4da",
"status": "affected",
"versionType": "git"
},
{
"version": "67cc570edaa02016a8685a06a0ee91f05a6277d9",
"lessThan": "7904b94768e983bcb2be34a8d6d1f3450f5b838b",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_tables_api.c"
],
"versions": [
{
"version": "5.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.9",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.108",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.49",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.13",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.3",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "6.6.158"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "6.12.108"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "6.18.49"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "7.1.13"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "7.2.3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/f010756ed75ac003146a1cbc93501092343bb3a3"
},
{
"url": "https://git.kernel.org/stable/c/6989f298103f575a768a85e4b19d2384709237f8"
},
{
"url": "https://git.kernel.org/stable/c/df86c0e84025be8b6dd572a20852698927aa666b"
},
{
"url": "https://git.kernel.org/stable/c/6fa88d11983c6fe693c13ed7c5b3b75ae9f39de6"
},
{
"url": "https://git.kernel.org/stable/c/e97e2d6d0b150fd78be573f9fdf193f204d9334e"
},
{
"url": "https://git.kernel.org/stable/c/68de7f3a38acab355c24114f77bf00d3094ce4da"
},
{
"url": "https://git.kernel.org/stable/c/7904b94768e983bcb2be34a8d6d1f3450f5b838b"
}
],
"title": "netfilter: nf_tables: don't queue packet path object notifications",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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