CVE-2026-74565 (GCVE-0-2026-74565)
Vulnerability from cvelistv5
Published
2026-08-15 12:28
Modified
2026-08-17 05:48
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: make nft_object rhltable per table
The nft_object rhltable is global, this allows for accessing objects
that are being dismangled from lookup path by other existing netns.
Given the nft_obj_destroy() releases the object inmediately, this might
lead to use-after-free of these objects that are being released.
Make the existing rhltable per table to address this issue to deal with
with the nft_rcv_nl_event() path too.
Update nft_obj_lookup() to take the table as non-const, otherwise,
compiler complains when passing the objname_ht to rhltable_lookup().
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"include/net/netfilter/nf_tables.h",
"net/netfilter/nf_tables_api.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "1948e4f85b855618b5b9a27265f98d816f4cb7cb",
"status": "affected",
"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
"versionType": "git"
},
{
"lessThan": "63ba12b664a2cd3220ed43e22c717715f4cc2ae8",
"status": "affected",
"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
"versionType": "git"
},
{
"lessThan": "7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af",
"status": "affected",
"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
"versionType": "git"
},
{
"lessThan": "f4f699790590bd0896c48a71e9232a65198f92f0",
"status": "affected",
"version": "4d44175aa5bb5f68772b1eb0306554812294ca52",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"include/net/netfilter/nf_tables.h",
"net/netfilter/nf_tables_api.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.1"
},
{
"lessThan": "5.1",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.103",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: make nft_object rhltable per table\n\nThe nft_object rhltable is global, this allows for accessing objects\nthat are being dismangled from lookup path by other existing netns.\nGiven the nft_obj_destroy() releases the object inmediately, this might\nlead to use-after-free of these objects that are being released.\nMake the existing rhltable per table to address this issue to deal with\nwith the nft_rcv_nl_event() path too.\n\nUpdate nft_obj_lookup() to take the table as non-const, otherwise,\ncompiler complains when passing the objname_ht to rhltable_lookup()."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The UAF is triggered only through local NETLINK_NETFILTER nftables configuration syscalls (NFT_MSG_NEWOBJ/GETOBJ/DELOBJ and rule/objref setup) that call nft_obj_lookup(); per kernel CNA guidance, nf_tables/netlink is Local, not network-reachable packet processing.\nAC:L - The attacker controls both sides of the race by running concurrent Netlink sockets\u2014one closing to fire nft_rcv_nl_event()/__nft_release_table() object teardown and another issuing object lookups/commits\u2014and can retry until the global rhltable collision-chain walk hits freed memory.\nPR:L - All nf_tables Netlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(); CAP_NET_ADMIN is obtainable by an unprivileged user inside a user+network namespace (unshare -Urn), not requiring init-namespace root.\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through their own nftables Netlink operations and socket close events without another user mounting, opening files, or taking any action.\nS:U - Impact is kernel heap use-after-free and potential local privilege escalation within the same kernel security authority; this is standard in-kernel memory corruption, not a distinct VM-guest-to-host or sandbox-boundary escape.\nC:H - nft_obj_lookup() holds rcu_read_lock and walks the global rhltable collision chain, dereferencing struct nft_object fields (key.table, ops, genmask) that nft_obj_destroy() may have already kfree\u0027d, giving arbitrary kernel memory read potential from UAF.\nI:H - Immediate kfree after rhltable_remove without waiting for RCU readers enables classic slab UAF heap corruption that can be groomed into arbitrary kernel writes, control-flow hijacking, and local privilege escalation beyond a bounded or transient fault.\nA:H - Concurrent destruction via nft_rcv_nl_event() and active nft_obj_lookup() reliably provokes KASAN-class slab use-after-free kernel oops/panic during rhlist traversal; UAF is inherently crash-prone even when not fully weaponized for code execution."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:48:45.246Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1948e4f85b855618b5b9a27265f98d816f4cb7cb"
},
{
"url": "https://git.kernel.org/stable/c/63ba12b664a2cd3220ed43e22c717715f4cc2ae8"
},
{
"url": "https://git.kernel.org/stable/c/7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af"
},
{
"url": "https://git.kernel.org/stable/c/f4f699790590bd0896c48a71e9232a65198f92f0"
}
],
"title": "netfilter: nf_tables: make nft_object rhltable per table",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74565",
"datePublished": "2026-08-15T12:28:07.015Z",
"dateReserved": "2026-08-15T05:44:03.916Z",
"dateUpdated": "2026-08-17T05:48:45.246Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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