| 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-2022-48643: netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain() |
| |
| syzbot is reporting underflow of nft_counters_enabled counter at |
| nf_tables_addchain() [1], for commit 43eb8949cfdffa76 ("netfilter: |
| nf_tables: do not leave chain stats enabled on error") missed that |
| nf_tables_chain_destroy() after nft_basechain_init() in the error path of |
| nf_tables_addchain() decrements the counter because nft_basechain_init() |
| makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag. |
| |
| Increment the counter immediately after returning from |
| nft_basechain_init(). |
| |
| The Linux kernel CVE team has assigned CVE-2022-48643 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10.140 with commit c907dfe4eaca9665694a0340de1458a093abe354 and fixed in 5.10.146 with commit 710e3f526bd23a0d33435dedc52c3144de284378 |
| Issue introduced in 5.15.64 with commit 6d7ddee503951641f3ec6f0e3269446970bbcdab and fixed in 5.15.71 with commit 91aa52652f4b37089aff3cb53e83049d826fef6d |
| Issue introduced in 5.19.6 with commit 98a621ef45e3605c7487f7fa6fec7df94697d6a2 and fixed in 5.19.12 with commit 8bcad2a931313aeba076b76922d5813ef97d0a91 |
| |
| 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-2022-48643 |
| 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: |
| 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/710e3f526bd23a0d33435dedc52c3144de284378 |
| https://git.kernel.org/stable/c/91aa52652f4b37089aff3cb53e83049d826fef6d |
| https://git.kernel.org/stable/c/8bcad2a931313aeba076b76922d5813ef97d0a91 |
| https://git.kernel.org/stable/c/921ebde3c0d22c8cba74ce8eb3cc4626abff1ccd |
