| 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-2024-42314: btrfs: fix extent map use-after-free when adding pages to compressed bio |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| btrfs: fix extent map use-after-free when adding pages to compressed bio |
| |
| At add_ra_bio_pages() we are accessing the extent map to calculate |
| 'add_size' after we dropped our reference on the extent map, resulting |
| in a use-after-free. Fix this by computing 'add_size' before dropping our |
| extent map reference. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42314 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit 6a4049102055250256623ab1875fabd89004bff8 and fixed in 6.1.108 with commit c1cc3326e27b0bd7a2806b40bc48e49afaf951e7 |
| Issue introduced in 5.16 with commit 6a4049102055250256623ab1875fabd89004bff8 and fixed in 6.6.44 with commit c205565e0f2f439f278a4a94ee97b67ef7b56ae8 |
| Issue introduced in 5.16 with commit 6a4049102055250256623ab1875fabd89004bff8 and fixed in 6.10.3 with commit b7859ff398b6b656e1689daa860eb34837b4bb89 |
| Issue introduced in 5.16 with commit 6a4049102055250256623ab1875fabd89004bff8 and fixed in 6.11 with commit 8e7860543a94784d744c7ce34b78a2e11beefa5c |
| |
| 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-2024-42314 |
| 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/btrfs/compression.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/c1cc3326e27b0bd7a2806b40bc48e49afaf951e7 |
| https://git.kernel.org/stable/c/c205565e0f2f439f278a4a94ee97b67ef7b56ae8 |
| https://git.kernel.org/stable/c/b7859ff398b6b656e1689daa860eb34837b4bb89 |
| https://git.kernel.org/stable/c/8e7860543a94784d744c7ce34b78a2e11beefa5c |
