| 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-2024-42242: mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE |
| |
| blk_queue_max_segment_size() ensured: |
| |
| if (max_size < PAGE_SIZE) |
| max_size = PAGE_SIZE; |
| |
| whereas: |
| |
| blk_validate_limits() makes it an error: |
| |
| if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE)) |
| return -EINVAL; |
| |
| The change from one to the other, exposed sdhci which was setting maximum |
| segment size too low in some circumstances. |
| |
| Fix the maximum segment size when it is too low. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42242 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.9 with commit 616f8766179277324393f7b77e07f14cb3503825 and fixed in 6.9.10 with commit bf78b1accef46efd9b624967cb74ae8d3c215a2b |
| Issue introduced in 6.9 with commit 616f8766179277324393f7b77e07f14cb3503825 and fixed in 6.10 with commit 63d20a94f24fc1cbaf44d0e7c0e0a8077fde0aef |
| |
| 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-2024-42242 |
| 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: |
| drivers/mmc/host/sdhci.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/bf78b1accef46efd9b624967cb74ae8d3c215a2b |
| https://git.kernel.org/stable/c/63d20a94f24fc1cbaf44d0e7c0e0a8077fde0aef |
