CVE-2023-54243High· 7.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= c58dd2dd443c26d856a168db108a0cd11c285bf3 < 9060abce3305ab2354c892c09d5689df51486df5Linux >= c58dd2dd443c26d856a168db108a0cd11c285bf3 < dbb3cbbf03b3c52cb390fabec357f1e4638004f5Linux >= c58dd2dd443c26d856a168db108a0cd11c285bf3 < 3dd6ac973351308d4117eda32298a9f1d68764fdLinux >= c58dd2dd443c26d856a168db108a0cd11c285bf3 < cda0e0243bd3c04008fcd37a46b0269fb3c49249Linux >= c58dd2dd443c26d856a168db108a0cd11c285bf3 < e58a171d35e32e6e8c37cfe0e8a94406732a331fLinux a3bc0f8ea439762aa62d40a295157410498cbea7Linux 8ed40c122919cd79bc3c059e5864e5e7d9d455f0Linux c5e4ef499cfc78de45a4f01b8c557b5964d77c53Linux f34728610b2a8c7b9864f9404f2884c17f6fca5cLinux 8b5740915a9faa8b1fa9166193a33e2a9ae30ec6Linux >= 3.2.60 < 3.3Linux >= 3.4.91 < 3.5Linux >= 3.10.41 < 3.11Linux >= 3.12.21 < 3.13Linux >= 3.14.5 < 3.15Linux 3.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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