CVE-2023-54243
netfilter: ebtables: fix table blob use-after-free
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
Published
- 10 months later
· 10 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.15% · top 96% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected c58dd2dd443c26d856a168db108a0cd11c285bf3 – < 9060abce3305ab2354c892c09d5689df51486df5
- affected c58dd2dd443c26d856a168db108a0cd11c285bf3 – < dbb3cbbf03b3c52cb390fabec357f1e4638004f5
- affected c58dd2dd443c26d856a168db108a0cd11c285bf3 – < 3dd6ac973351308d4117eda32298a9f1d68764fd
- affected c58dd2dd443c26d856a168db108a0cd11c285bf3 – < cda0e0243bd3c04008fcd37a46b0269fb3c49249
- affected c58dd2dd443c26d856a168db108a0cd11c285bf3 – < e58a171d35e32e6e8c37cfe0e8a94406732a331f
- affected a3bc0f8ea439762aa62d40a295157410498cbea7
- affected 8ed40c122919cd79bc3c059e5864e5e7d9d455f0
- affected c5e4ef499cfc78de45a4f01b8c557b5964d77c53
- affected f34728610b2a8c7b9864f9404f2884c17f6fca5c
- affected 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6
- affected 3.2.60 – < 3.3
- affected 3.4.91 – < 3.5
- affected 3.10.41 – < 3.11
- affected 3.12.21 – < 3.13
- affected 3.14.5 – < 3.15
- affected 3.15
- unaffected < 3.15
- unaffected 5.10.173 – ≤ 5.10.*
- unaffected 5.15.100 – ≤ 5.15.*
- unaffected 6.1.18 – ≤ 6.1.*
- unaffected 6.2.5 – ≤ 6.2.*
- unaffected 6.3 – ≤ *
References (5)
- https://git.kernel.org/stable/c/9060abce3305ab2354c892c09d5689df51486df5 (opens in a new tab)
- https://git.kernel.org/stable/c/dbb3cbbf03b3c52cb390fabec357f1e4638004f5 (opens in a new tab)
- https://git.kernel.org/stable/c/3dd6ac973351308d4117eda32298a9f1d68764fd (opens in a new tab)
- https://git.kernel.org/stable/c/cda0e0243bd3c04008fcd37a46b0269fb3c49249 (opens in a new tab)
- https://git.kernel.org/stable/c/e58a171d35e32e6e8c37cfe0e8a94406732a331f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-54243)Record last updated .