| 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-2024-57940: exfat: fix the infinite loop in exfat_readdir() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| exfat: fix the infinite loop in exfat_readdir() |
| |
| If the file system is corrupted so that a cluster is linked to |
| itself in the cluster chain, and there is an unused directory |
| entry in the cluster, 'dentry' will not be incremented, causing |
| condition 'dentry < max_dentries' unable to prevent an infinite |
| loop. |
| |
| This infinite loop causes s_lock not to be released, and other |
| tasks will hang, such as exfat_sync_fs(). |
| |
| This commit stops traversing the cluster chain when there is unused |
| directory entry in the cluster to avoid this infinite loop. |
| |
| The Linux kernel CVE team has assigned CVE-2024-57940 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 5.10.234 with commit d8cfbb8723bd3d3222f360227a1cc15227189ca6 |
| Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 5.15.177 with commit 28c21f0ac5293a4bf19b3e0e32005d6dd31a6c17 |
| Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.1.125 with commit 31beabd0f47f8c3ed9965ba861c9e5b252d4920a |
| Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.6.72 with commit dc1d7afceb982e8f666e70a582e6b5aa806de063 |
| Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.12.10 with commit d9ea94f5cd117d56e573696d0045ab3044185a15 |
| Issue introduced in 5.7 with commit ca06197382bde0a3bc20215595d1c9ce20c6e341 and fixed in 6.13 with commit fee873761bd978d077d8c55334b4966ac4cb7b59 |
| |
| 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-2024-57940 |
| 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/exfat/dir.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/d8cfbb8723bd3d3222f360227a1cc15227189ca6 |
| https://git.kernel.org/stable/c/28c21f0ac5293a4bf19b3e0e32005d6dd31a6c17 |
| https://git.kernel.org/stable/c/31beabd0f47f8c3ed9965ba861c9e5b252d4920a |
| https://git.kernel.org/stable/c/dc1d7afceb982e8f666e70a582e6b5aa806de063 |
| https://git.kernel.org/stable/c/d9ea94f5cd117d56e573696d0045ab3044185a15 |
| https://git.kernel.org/stable/c/fee873761bd978d077d8c55334b4966ac4cb7b59 |
