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vuln-cve/data/2026/99xxx/CVE-2026-99167.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-99167",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.398Z",
"datePublished": "2026-10-28T10:35:18.850Z",
"dateUpdated": "2026-10-31T12:44:30.175Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-31T12:44:30.175Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix use-after-free in __tcf_action_put()\n\n__tcf_action_put() decrements the reference count before decrementing the\nbinding count. Another thread can free the action between these operations,\ncausing the binding-count update to access freed memory. KASAN reports it\nas:\n\n BUG: KASAN: slab-use-after-free in __tcf_action_put+0x327/0x340\n Write of size 4 at addr ff11000000d46420 by task tc-put-pause/64\n\nHold the action IDR mutex across both counter updates and IDR removal,\nkeeping cleanup outside the lock."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - An attacker reaches the patched __tcf_action_put() through local NETLINK_ROUTE messages: sendmsg() -> rtnetlink_rcv_msg() -> tc_new_tfilter()/tc_del_tfilter() -> tcf_action_destroy(). No received network packet supplies the action release operation.\nAC:L - RTM_NEWTFILTER and RTM_DELTFILTER are unlocked for flower on clsact/ingress; the attacker can race a failing bind request's tcf_action_destroy() against deletion cleanup of the same indexed action. One put takes tcfa_refcnt 2->1 before tcfa_bindcnt while the other takes 1->0 and frees it, so both sides are attacker-controlled.\nPR:L - rtnetlink_rcv_msg() requires netlink_net_capable(skb, CAP_NET_ADMIN), but checks the user namespace owning the socket's network namespace. An unprivileged user can use unshare(CLONE_NEWUSER|CLONE_NEWNET) to obtain that capability in the new namespace and configure its clsact/flower objects.\nUI:N - After creating the namespace and TC objects, the attacker alone sends the racing RTM_NEWTFILTER and RTM_DELTFILTER messages; no victim action is required.\nS:U - __tcf_action_put() corrupts memory in the same host kernel that processes and authorizes the NETLINK_ROUTE requests; exploitation does not cross a VM or IOMMU security boundary.\nC:H - After free_tcf() queues p for reclamation through kfree_rcu(), the stale path retains p and later accesses the reclaimed tcfa_bindcnt slot. Action-heap grooming can turn corruption of a replacement object into control-flow execution and arbitrary kernel-memory disclosure.\nI:H - atomic_dec(&p->tcfa_bindcnt) performs a 32-bit write after the tc_action allocation has been reclaimed; spraying a same-cache replacement can corrupt its refcount, length, or control data and enable kernel code execution or arbitrary modification.\nA:H - The reported KASAN slab-use-after-free is the stale atomic_dec() write in __tcf_action_put(); corrupting the replacement object can cause an oops or panic, and the attacker can repeatedly attempt the netlink race."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/act_api.c"
],
"versions": [
{
"version": "16af6067392c40e454e49eec834843ab03643d96",
"lessThan": "4d83a3fc03bc595dd39b79ad61288738fbb1f2ba",
"status": "affected",
"versionType": "git"
},
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"status": "affected",
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"lessThan": "fcc7d734ceccfab8ec3398c5b34f8e775d459507",
"status": "affected",
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{
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"lessThan": "fde33eb9955d819af282d5f5e84684eaec248291",
"status": "affected",
"versionType": "git"
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{
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"lessThan": "969ad6f2b266f383b44194d50d15631969b26222",
"status": "affected",
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{
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"lessThan": "2465d27ef90de9105c2bffb6c35f8ce08918e642",
"status": "affected",
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{
"version": "16af6067392c40e454e49eec834843ab03643d96",
"lessThan": "2e012e431aa271ef3c84206f48854f539c03bff0",
"status": "affected",
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},
{
"version": "16af6067392c40e454e49eec834843ab03643d96",
"lessThan": "7b16eb911091aae237a8673da94e4dfb9cd21d54",
"status": "affected",
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}
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},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/act_api.c"
],
"versions": [
{
"version": "4.19",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.19",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.161",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.115",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.59",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.13",
"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": [
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"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19",
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},
{
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/4d83a3fc03bc595dd39b79ad61288738fbb1f2ba"
},
{
"url": "https://git.kernel.org/stable/c/fd01abed2568209f7daaf60e5ee68ae4a4744f48"
},
{
"url": "https://git.kernel.org/stable/c/fcc7d734ceccfab8ec3398c5b34f8e775d459507"
},
{
"url": "https://git.kernel.org/stable/c/fde33eb9955d819af282d5f5e84684eaec248291"
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{
"url": "https://git.kernel.org/stable/c/969ad6f2b266f383b44194d50d15631969b26222"
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{
"url": "https://git.kernel.org/stable/c/2465d27ef90de9105c2bffb6c35f8ce08918e642"
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{
"url": "https://git.kernel.org/stable/c/2e012e431aa271ef3c84206f48854f539c03bff0"
},
{
"url": "https://git.kernel.org/stable/c/7b16eb911091aae237a8673da94e4dfb9cd21d54"
}
],
"title": "net/sched: fix use-after-free in __tcf_action_put()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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