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vuln-cve/data/2026/98xxx/CVE-2026-98320.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-98320",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.340Z",
"datePublished": "2026-10-06T08:46:14.757Z",
"dateUpdated": "2026-10-19T09:17:30.784Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T09:17:30.784Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: hold reference on ct until flow is released\n\nnf_ct_put() releases the ct->ext area inmediately, the rcu typesafe\nsemantics also allow to refer to the wrong conntrack from the flowtable\ndatapath. Hold reference on ct until flow is released after rcu grace\nperiod.\n\nAdd rcu_barrier() on module exit path, to ensure pending flow entries\nare release before module goes away."
}
],
"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 - The freed ct is reached from nf_flow_offload_forward() (nf_ct_acct_update/flow_offload_teardown on flow->ct) but freeing it needs the conntrack killed (nf_ct_is_dying) and flow_offload_del() run; a remote peer only supplies forwarded packets and cannot kill an offloaded ct, so the full trigger needs local nftables/ctnetlink access.\nAC:L - The attacker drives every side of the race: they flood packets through their own flowtable, delete the ct via ctnetlink, and force nf_flow_offload_gc_step()->flow_offload_del() at once by downing the veth (nf_flow_table_gc_cleanup flush_delayed_work). The window is narrow but can be retried indefinitely.\nPR:L - Creating the nftables flowtable, adding veth forwarding and sending IPCTNL_MSG_CT_DELETE need only CAP_NET_ADMIN in a network namespace, which an unprivileged user gets via unshare -Urn.\nUI:N - No victim action is needed; the attacker sets up the flowtable, the traffic and the conntrack/flow teardown entirely within their own namespace.\nS:U - Memory corruption in the host kernel's netfilter flowtable/conntrack objects yields kernel privilege escalation within the same authority; no VM or hardware boundary is crossed.\nC:H - flow_offload_free() dropped the ct reference before the RCU grace period, so in-flight readers dereference ct->ext after nf_conntrack_free() has kfree'd it, or a recycled SLAB_TYPESAFE_BY_RCU nf_conn now owned by another connection - a use-after-free that can be groomed to leak kernel memory.\nI:H - The stale reader writes freed or reused memory: nf_ct_acct_add() does atomic64_add into the freed ct->ext counters, and flow_offload_teardown()/flow_offload_fixup_ct() modify status/timeout of a recycled conntrack, giving heap-corruption primitives.\nA:H - The use-after-free on ct->ext and recycled nf_conn objects in the forwarding softirq can corrupt the slab and crash the kernel."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/nf_flow_table_core.c"
],
"versions": [
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "93ff1594be1aad4da364462dd8db050ebcfda2de",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "eed6997e8dc40593a539fcc722e7ed51b18db86c",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "61c6688be282277c6e91ab286a7acd0ae8681ac6",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "a43cd2b67b91e943273c913237a7a88c50cdcfbc",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "8274cdc5f9c57e17ed77fc4ba76212536c840f25",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "12c1ac230f4ca16e0017b62a963ab75e0b48074f",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "d9e6175a3ee48209ee65f294fc567b4e16b29b74",
"status": "affected",
"versionType": "git"
},
{
"version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
"lessThan": "e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d",
"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_flow_table_core.c"
],
"versions": [
{
"version": "4.16",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.16",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.271",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.222",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.54",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.8",
"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": "4.16",
"versionEndExcluding": "5.10.271"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "5.15.222"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.1.189"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.6.158"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.12.112"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.18.54"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "7.2.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/93ff1594be1aad4da364462dd8db050ebcfda2de"
},
{
"url": "https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c"
},
{
"url": "https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6"
},
{
"url": "https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc"
},
{
"url": "https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25"
},
{
"url": "https://git.kernel.org/stable/c/12c1ac230f4ca16e0017b62a963ab75e0b48074f"
},
{
"url": "https://git.kernel.org/stable/c/d9e6175a3ee48209ee65f294fc567b4e16b29b74"
},
{
"url": "https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d"
}
],
"title": "netfilter: flowtable: hold reference on ct until flow is released",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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