| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-26774: ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ext4: avoid dividing by 0 in mb_update_avg_fragment_size() when block bitmap corrupt |
| |
| Determine if bb_fragments is 0 instead of determining bb_free to eliminate |
| the risk of dividing by zero when the block bitmap is corrupted. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26774 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit 83e80a6e3543f37f74c8e48a5f305b054b65ce2a and fixed in 5.15.150 with commit 687061cfaa2ac3095170e136dd9c29a4974f41d4 |
| Issue introduced in 6.0 with commit 83e80a6e3543f37f74c8e48a5f305b054b65ce2a and fixed in 6.1.80 with commit 8b40eb2e716b503f7a4e1090815a17b1341b2150 |
| Issue introduced in 6.0 with commit 83e80a6e3543f37f74c8e48a5f305b054b65ce2a and fixed in 6.6.19 with commit f32d2a745b02123258026e105a008f474f896d6a |
| Issue introduced in 6.0 with commit 83e80a6e3543f37f74c8e48a5f305b054b65ce2a and fixed in 6.7.7 with commit 8cf9cc602cfb40085967c0d140e32691c8b71cf3 |
| Issue introduced in 6.0 with commit 83e80a6e3543f37f74c8e48a5f305b054b65ce2a and fixed in 6.8 with commit 993bf0f4c393b3667830918f9247438a8f6fdb5b |
| Issue introduced in 5.19.12 with commit 398a0fdb38d9ab5e68023667cc5e6e3d109e2d6b |
| |
| 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-2024-26774 |
| 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/687061cfaa2ac3095170e136dd9c29a4974f41d4 |
| https://git.kernel.org/stable/c/8b40eb2e716b503f7a4e1090815a17b1341b2150 |
| https://git.kernel.org/stable/c/f32d2a745b02123258026e105a008f474f896d6a |
| https://git.kernel.org/stable/c/8cf9cc602cfb40085967c0d140e32691c8b71cf3 |
| https://git.kernel.org/stable/c/993bf0f4c393b3667830918f9247438a8f6fdb5b |
