| 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-2024-47700: ext4: check stripe size compatibility on remount as well |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ext4: check stripe size compatibility on remount as well |
| |
| We disable stripe size in __ext4_fill_super if it is not a multiple of |
| the cluster ratio however this check is missed when trying to remount. |
| This can leave us with cases where stripe < cluster_ratio after |
| remount:set making EXT4_B2C(sbi->s_stripe) become 0 that can cause some |
| unforeseen bugs like divide by 0. |
| |
| Fix that by adding the check in remount path as well. |
| |
| The Linux kernel CVE team has assigned CVE-2024-47700 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.5 with commit c3defd99d58cbdd132bd197714e5523dac976b66 and fixed in 6.6.54 with commit faeff8b1ee2eaa5969c8e994d66c3337298cefed |
| Issue introduced in 6.5 with commit c3defd99d58cbdd132bd197714e5523dac976b66 and fixed in 6.10.13 with commit 297615e992bbb30a55c158141086be6505d5d722 |
| Issue introduced in 6.5 with commit c3defd99d58cbdd132bd197714e5523dac976b66 and fixed in 6.11.2 with commit a31b712f75445d52fc0451dc54fd7b16a552cb7c |
| Issue introduced in 6.5 with commit c3defd99d58cbdd132bd197714e5523dac976b66 and fixed in 6.12 with commit ee85e0938aa8f9846d21e4d302c3cf6a2a75110d |
| |
| 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-2024-47700 |
| 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/super.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/faeff8b1ee2eaa5969c8e994d66c3337298cefed |
| https://git.kernel.org/stable/c/297615e992bbb30a55c158141086be6505d5d722 |
| https://git.kernel.org/stable/c/a31b712f75445d52fc0451dc54fd7b16a552cb7c |
| https://git.kernel.org/stable/c/ee85e0938aa8f9846d21e4d302c3cf6a2a75110d |
