Answer in brief
CVE-2023-54243 records a High severity (CVSS 7.8) vulnerability in netfilter: ebtables: fix table blob use-after-free. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=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 | 9060abce3305ab2354c892c09d5689df51486df5, dbb3cbbf03b3c52cb390fabec357f1e4638004f5, 3dd6ac973351308d4117eda32298a9f1d68764fd, cda0e0243bd3c04008fcd37a46b0269fb3c49249, e58a171d35e32e6e8c37cfe0e8a94406732a331f, 3.3, 3.5, 3.11, 3.13, 3.15 |
| Linux/Linuxgeneric | 3.15 | Not reported |
Published upstream
Dec 30, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.