CVE-2023-54243 (GCVE-0-2023-54243)
Vulnerability from cvelistv5
Published
2025-12-30 12:11
Modified
2025-12-30 12:11
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ebtables: fix table blob use-after-free
We are not allowed to return an error at this point.
Looking at the code it looks like ret is always 0 at this
point, but its not.
t = find_table_lock(net, repl->name, &ret, &ebt_mutex);
... this can return a valid table, with ret != 0.
This bug causes update of table->private with the new
blob, but then frees the blob right away in the caller.
Syzbot report:
BUG: KASAN: vmalloc-out-of-bounds in __ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168
Read of size 4 at addr ffffc90005425000 by task kworker/u4:4/74
Workqueue: netns cleanup_net
Call Trace:
kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
__ebt_unregister_table+0xc00/0xcd0 net/bridge/netfilter/ebtables.c:1168
ebt_unregister_table+0x35/0x40 net/bridge/netfilter/ebtables.c:1372
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:169
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613
...
ip(6)tables appears to be ok (ret should be 0 at this point) but make
this more obvious.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: c58dd2dd443c26d856a168db108a0cd11c285bf3 Version: c58dd2dd443c26d856a168db108a0cd11c285bf3 Version: c58dd2dd443c26d856a168db108a0cd11c285bf3 Version: c58dd2dd443c26d856a168db108a0cd11c285bf3 Version: c58dd2dd443c26d856a168db108a0cd11c285bf3 Version: a3bc0f8ea439762aa62d40a295157410498cbea7 Version: 8ed40c122919cd79bc3c059e5864e5e7d9d455f0 Version: c5e4ef499cfc78de45a4f01b8c557b5964d77c53 Version: f34728610b2a8c7b9864f9404f2884c17f6fca5c Version: 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bridge/netfilter/ebtables.c",
"net/ipv4/netfilter/ip_tables.c",
"net/ipv6/netfilter/ip6_tables.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9060abce3305ab2354c892c09d5689df51486df5",
"status": "affected",
"version": "c58dd2dd443c26d856a168db108a0cd11c285bf3",
"versionType": "git"
},
{
"lessThan": "dbb3cbbf03b3c52cb390fabec357f1e4638004f5",
"status": "affected",
"version": "c58dd2dd443c26d856a168db108a0cd11c285bf3",
"versionType": "git"
},
{
"lessThan": "3dd6ac973351308d4117eda32298a9f1d68764fd",
"status": "affected",
"version": "c58dd2dd443c26d856a168db108a0cd11c285bf3",
"versionType": "git"
},
{
"lessThan": "cda0e0243bd3c04008fcd37a46b0269fb3c49249",
"status": "affected",
"version": "c58dd2dd443c26d856a168db108a0cd11c285bf3",
"versionType": "git"
},
{
"lessThan": "e58a171d35e32e6e8c37cfe0e8a94406732a331f",
"status": "affected",
"version": "c58dd2dd443c26d856a168db108a0cd11c285bf3",
"versionType": "git"
},
{
"status": "affected",
"version": "a3bc0f8ea439762aa62d40a295157410498cbea7",
"versionType": "git"
},
{
"status": "affected",
"version": "8ed40c122919cd79bc3c059e5864e5e7d9d455f0",
"versionType": "git"
},
{
"status": "affected",
"version": "c5e4ef499cfc78de45a4f01b8c557b5964d77c53",
"versionType": "git"
},
{
"status": "affected",
"version": "f34728610b2a8c7b9864f9404f2884c17f6fca5c",
"versionType": "git"
},
{
"status": "affected",
"version": "8b5740915a9faa8b1fa9166193a33e2a9ae30ec6",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bridge/netfilter/ebtables.c",
"net/ipv4/netfilter/ip_tables.c",
"net/ipv6/netfilter/ip6_tables.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.15"
},
{
"lessThan": "3.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.173",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.100",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.18",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.2.*",
"status": "unaffected",
"version": "6.2.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.173",
"versionStartIncluding": "3.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.100",
"versionStartIncluding": "3.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.18",
"versionStartIncluding": "3.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.2.5",
"versionStartIncluding": "3.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.3",
"versionStartIncluding": "3.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.2.60",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.4.91",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.10.41",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.12.21",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.14.5",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003ename, \u0026ret, \u0026ebt_mutex);\n\n... this can return a valid table, with ret != 0.\n\nThis bug causes update of table-\u003eprivate 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."
}
],
"providerMetadata": {
"dateUpdated": "2025-12-30T12:11:31.180Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
},
{
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-54243",
"datePublished": "2025-12-30T12:11:31.180Z",
"dateReserved": "2025-12-30T12:06:44.510Z",
"dateUpdated": "2025-12-30T12:11:31.180Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2023-54243\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:12.880\",\"lastModified\":\"2025-12-30T13:16:12.880\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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-\u003ename, \u0026ret, \u0026ebt_mutex);\\n\\n... this can return a valid table, with ret != 0.\\n\\nThis bug causes update of table-\u003eprivate 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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
Loading…
Loading…
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.
Loading…
Loading…