| 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-2024-43845: udf: Fix bogus checksum computation in udf_rename() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| udf: Fix bogus checksum computation in udf_rename() |
| |
| Syzbot reports uninitialized memory access in udf_rename() when updating |
| checksum of '..' directory entry of a moved directory. This is indeed |
| true as we pass on-stack diriter.fi to the udf_update_tag() and because |
| that has only struct fileIdentDesc included in it and not the impUse or |
| name fields, the checksumming function is going to checksum random stack |
| contents beyond the end of the structure. This is actually harmless |
| because the following udf_fiiter_write_fi() will recompute the checksum |
| from on-disk buffers where everything is properly included. So all that |
| is needed is just removing the bogus calculation. |
| |
| The Linux kernel CVE team has assigned CVE-2024-43845 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1.114 with commit 9616d00140a1cdf0bfa557019b36923dc7796942 and fixed in 6.1.107 with commit c996b570305e7a6910c2ce4cdcd4c22757ffe241 |
| Issue introduced in 6.3 with commit e9109a92d2a95889498bed3719cd2318892171a2 and fixed in 6.6.44 with commit fe2ead240c31e8d158713beca9d0681a6e6a53ab |
| Issue introduced in 6.3 with commit e9109a92d2a95889498bed3719cd2318892171a2 and fixed in 6.10.3 with commit 40d7b3ed52449d36143bab8d3e70926aa61a60f4 |
| Issue introduced in 6.3 with commit e9109a92d2a95889498bed3719cd2318892171a2 and fixed in 6.11 with commit 27ab33854873e6fb958cb074681a0107cc2ecc4c |
| |
| 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-2024-43845 |
| 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/udf/namei.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/9c439311c13fc6faab1921441165c9b8b500c83b |
| https://git.kernel.org/stable/c/c996b570305e7a6910c2ce4cdcd4c22757ffe241 |
| https://git.kernel.org/stable/c/fe2ead240c31e8d158713beca9d0681a6e6a53ab |
| https://git.kernel.org/stable/c/40d7b3ed52449d36143bab8d3e70926aa61a60f4 |
| https://git.kernel.org/stable/c/27ab33854873e6fb958cb074681a0107cc2ecc4c |
