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vuln-cve/data/2023/54xxx/CVE-2023-54243.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2023-54243",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-12-30T12:06:44.510Z",
"datePublished": "2025-12-30T12:11:31.180Z",
"dateUpdated": "2026-10-15T21:41:43.012Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T09:18:22.593Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: fix table blob use-after-free\n\nWe are not allowed to return an error at this point.\nLooking at the code it looks like ret is always 0 at this\npoint, but its not.\n\nt = find_table_lock(net, repl->name, &ret, &ebt_mutex);\n\n... this can return a valid table, with ret != 0.\n\nThis bug causes update of table->private with the new\nblob, but then frees the blob right away in the caller.\n\nSyzbot report:\n\nBUG: KASAN: vmalloc-out-of-bounds in __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168\nRead of size 4 at addr ffffc90005425000 by task kworker/u4:4/74\nWorkqueue: netns cleanup_net\nCall Trace:\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:517\n __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168\n ebt_unregister_table+0x35/0x40 net/bridge/netfilter/ebtables.c:1372\n ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169\n cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613\n...\n\nip(6)tables appears to be ok (ret should be 0 at this point) but make\nthis more obvious."
}
],
"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 vulnerable path is reached through the ebtables setsockopt configuration interface (EBT_SO_SET_ENTRIES → do_replace), a local syscall on a socket, not remote network data.\nAC:L - The attacker fully controls the triggering sequence (table replacement with module autoload, plus any concurrent registration race), and syzbot reproduced it reliably; per guidance attacker-controlled races and UAFs are Low.\nPR:L - The path requires CAP_NET_ADMIN only over net->user_ns, which an unprivileged user obtains in a fresh user+network namespace via `unshare -Urn`; no real root is needed.\nUI:N - The attacker triggers the entire flow via their own setsockopt calls; no victim action is required.\nS:U - The corruption stays within the kernel's own memory/security authority in the same (namespaced) context; no VM/IOMMU boundary is crossed.\nC:H - The freed table blob remains live as t->private and is reallocatable by the attacker, allowing controlled reads (counters, kernel data) — a use-after-free yields high confidentiality impact.\nI:H - The UAF lets the attacker place a crafted blob at the freed address; ebt_do_table dereferences target function pointers from it, giving heap-spray-based arbitrary write / control-flow hijack.\nA:H - The use-after-free causes kernel oops/panic (as shown by the KASAN report in __ebt_unregister_table) and is trivially weaponizable into a crash."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/bridge/netfilter/ebtables.c",
"net/ipv4/netfilter/ip_tables.c",
"net/ipv6/netfilter/ip6_tables.c"
],
"versions": [
{
"version": "c58dd2dd443c26d856a168db108a0cd11c285bf3",
"lessThan": "9060abce3305ab2354c892c09d5689df51486df5",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "dbb3cbbf03b3c52cb390fabec357f1e4638004f5",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "3dd6ac973351308d4117eda32298a9f1d68764fd",
"status": "affected",
"versionType": "git"
},
{
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"status": "affected",
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"status": "affected",
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{
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"status": "affected",
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},
{
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"status": "affected",
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},
{
"version": "3.2.60",
"lessThan": "3.3",
"status": "affected",
"versionType": "semver"
},
{
"version": "3.4.91",
"lessThan": "3.5",
"status": "affected",
"versionType": "semver"
},
{
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"lessThan": "3.11",
"status": "affected",
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},
{
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"lessThan": "3.13",
"status": "affected",
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},
{
"version": "3.14.5",
"lessThan": "3.15",
"status": "affected",
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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/bridge/netfilter/ebtables.c",
"net/ipv4/netfilter/ip_tables.c",
"net/ipv6/netfilter/ip6_tables.c"
],
"versions": [
{
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"status": "affected"
},
{
"version": "0",
"lessThan": "3.15",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.173",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.100",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.18",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.2.5",
"lessThanOrEqual": "6.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.15",
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},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
{
"url": "https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5"
},
{
"url": "https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5"
},
{
"url": "https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd"
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{
"url": "https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249"
},
{
"url": "https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f"
}
],
"title": "netfilter: ebtables: fix table blob use-after-free",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2023-54243",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:39:46.179216Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T21:41:43.012Z"
}
}
]
}
}
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