7.8

CVE-2023-54243: linux

CVSS: 7.8v3.1HighDeferred
AliasesUBUNTU-CVE-2023-54243DEBIAN-CVE-2023-54243
Published 30-12-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2023-54243 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 7
SUSE-SU-2026:0350-1SUSE-SU-2026:0369-1SUSE-SU-2026:0411-1SUSE-SU-2026:0473-1SUSE-SU-2026:0474-1SUSE-SU-2026:0496-1

Timeline

  1. 30-12-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.01 pp

From 0.14% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu124 products
  • linuxAll versions (No fix recorded) | < 5.15.0-79.86
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1042.47
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.20-1
Linux1 product
  • linux≥ 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 | 3.15

3 vendors · 126 products

References

9 links