| 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-2024-26601: ext4: regenerate buddy after block freeing failed if under fc replay |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ext4: regenerate buddy after block freeing failed if under fc replay |
| |
| This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant |
| mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on |
| code in mb_free_blocks(), fast commit replay can end up marking as free |
| blocks that are already marked as such. This causes corruption of the |
| buddy bitmap so we need to regenerate it in that case. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26601 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.10.181 with commit 0983142c5f17a62055ec851372273c3bc77e4788 and fixed in 5.10.211 with commit 94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a |
| Issue introduced in 5.11 with commit 6bd97bf273bdb4944904e57480f6545bca48ad77 and fixed in 5.15.150 with commit c1317822e2de80e78f137d3a2d99febab1b80326 |
| Issue introduced in 5.11 with commit 6bd97bf273bdb4944904e57480f6545bca48ad77 and fixed in 6.1.78 with commit 78327acd4cdc4a1601af718b781eece577b6b7d4 |
| Issue introduced in 5.11 with commit 6bd97bf273bdb4944904e57480f6545bca48ad77 and fixed in 6.6.17 with commit ea42d6cffb0dd27a417f410b9d0011e9859328cb |
| Issue introduced in 5.11 with commit 6bd97bf273bdb4944904e57480f6545bca48ad77 and fixed in 6.7.5 with commit 6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 |
| Issue introduced in 5.11 with commit 6bd97bf273bdb4944904e57480f6545bca48ad77 and fixed in 6.8 with commit c9b528c35795b711331ed36dc3dbee90d5812d4e |
| |
| 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-2024-26601 |
| 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: |
| fs/ext4/mballoc.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/94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a |
| https://git.kernel.org/stable/c/c1317822e2de80e78f137d3a2d99febab1b80326 |
| https://git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4 |
| https://git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb |
| https://git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 |
| https://git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e |
