CVE-2023-54243

HighCVSS 7.8/10Last modified Oct 15, 2026

Description

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected software

VendorProductVersions
LinuxLinux>= c58dd2dd443c26d856a168db108a0cd11c285bf3, < 9060abce3305ab2354c892c09d5689df51486df5; >= c58dd2dd443c26d856a168db108a0cd11c285bf3, < dbb3cbbf03b3c52cb390fabec357f1e4638004f5; >= c58dd2dd443c26d856a168db108a0cd11c285bf3, < 3dd6ac973351308d4117eda32298a9f1d68764fd; >= c58dd2dd443c26d856a168db108a0cd11c285bf3, < cda0e0243bd3c04008fcd37a46b0269fb3c49249; >= c58dd2dd443c26d856a168db108a0cd11c285bf3, < e58a171d35e32e6e8c37cfe0e8a94406732a331f; a3bc0f8ea439762aa62d40a295157410498cbea7; 8ed40c122919cd79bc3c059e5864e5e7d9d455f0; c5e4ef499cfc78de45a4f01b8c557b5964d77c53; f34728610b2a8c7b9864f9404f2884c17f6fca5c; 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6; >= 3.2.60, < 3.3; >= 3.4.91, < 3.5; >= 3.10.41, < 3.11; >= 3.12.21, < 3.13; >= 3.14.5, < 3.15
LinuxLinux3.15

References

Timeline

Published
Dec 30, 2025
Last modified
Oct 15, 2026
NVD status
Deferred

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CVE-2023-54243: High severity, CVSS 7.8 | Vulnix