CVE-2023-54243 (GCVE-0-2023-54243)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2025-12-30 12:11
VLAI?
Title
netfilter: ebtables: fix table blob use-after-free
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < 9060abce3305ab2354c892c09d5689df51486df5 (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < dbb3cbbf03b3c52cb390fabec357f1e4638004f5 (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < 3dd6ac973351308d4117eda32298a9f1d68764fd (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < cda0e0243bd3c04008fcd37a46b0269fb3c49249 (git)
Affected: c58dd2dd443c26d856a168db108a0cd11c285bf3 , < e58a171d35e32e6e8c37cfe0e8a94406732a331f (git)
Affected: a3bc0f8ea439762aa62d40a295157410498cbea7 (git)
Affected: 8ed40c122919cd79bc3c059e5864e5e7d9d455f0 (git)
Affected: c5e4ef499cfc78de45a4f01b8c557b5964d77c53 (git)
Affected: f34728610b2a8c7b9864f9404f2884c17f6fca5c (git)
Affected: 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6 (git)
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    Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.100 , ≤ 5.15.* (semver)
Unaffected: 6.1.18 , ≤ 6.1.* (semver)
Unaffected: 6.2.5 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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      "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."
        }
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      "title": "netfilter: ebtables: fix table blob use-after-free",
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    "datePublished": "2025-12-30T12:11:31.180Z",
    "dateReserved": "2025-12-30T12:06:44.510Z",
    "dateUpdated": "2025-12-30T12:11:31.180Z",
    "state": "PUBLISHED"
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