| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2023-52581: netfilter: nf_tables: fix memleak when more than 255 elements expired |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netfilter: nf_tables: fix memleak when more than 255 elements expired |
| |
| When more than 255 elements expired we're supposed to switch to a new gc |
| container structure. |
| |
| This never happens: u8 type will wrap before reaching the boundary |
| and nft_trans_gc_space() always returns true. |
| |
| This means we recycle the initial gc container structure and |
| lose track of the elements that came before. |
| |
| While at it, don't deref 'gc' after we've passed it to call_rcu. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52581 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.5 with commit 5f68718b34a531a556f2f50300ead2862278da26 and fixed in 6.5.6 with commit 4aea243b6853d06c1d160a9955b759189aa02b14 |
| Issue introduced in 6.5 with commit 5f68718b34a531a556f2f50300ead2862278da26 and fixed in 6.6 with commit cf5000a7787cbc10341091d37245a42c119d26c5 |
| Issue introduced in 6.4.11 with commit 0624f190b5742a1527cd938295caa8dc5281d4cd |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2023-52581 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| include/net/netfilter/nf_tables.h |
| net/netfilter/nf_tables_api.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/7cf055b43756b10aa2b851c927c940f5ed652125 |
| https://git.kernel.org/stable/c/a995a68e8a3b48533e47c856865d109a1f1a9d01 |
| https://git.kernel.org/stable/c/09c85f2d21ab6b5acba31a037985b13e8e6565b8 |
| https://git.kernel.org/stable/c/ef99506eaf1dc31feff1adfcfd68bc5535a22171 |
| https://git.kernel.org/stable/c/7e5d732e6902eb6a37b35480796838a145ae5f07 |
| https://git.kernel.org/stable/c/4aea243b6853d06c1d160a9955b759189aa02b14 |
| https://git.kernel.org/stable/c/cf5000a7787cbc10341091d37245a42c119d26c5 |
