| 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-2022-49343: ext4: avoid cycles in directory h-tree |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ext4: avoid cycles in directory h-tree |
| |
| A maliciously corrupted filesystem can contain cycles in the h-tree |
| stored inside a directory. That can easily lead to the kernel corrupting |
| tree nodes that were already verified under its hands while doing a node |
| split and consequently accessing unallocated memory. Fix the problem by |
| verifying traversed block numbers are unique. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49343 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.14.283 with commit 24b8206fec1db21d7e82f21f0b2ff5e5672cf5b3 |
| Fixed in 4.19.247 with commit b3ad9ff6f06c1dc6abf7437691c88ca3d6da3ac0 |
| Fixed in 5.4.198 with commit e157c8f87e8fac112d6c955e69a60cdb9bc80a60 |
| Fixed in 5.10.121 with commit ff4cafa51762da3824881a9000ca421d4b78b138 |
| Fixed in 5.15.46 with commit 3a3ce941645407cd0b0b7f01ad9e2ea3770f46cc |
| Fixed in 5.17.14 with commit d5a16a6df2c16eaf4de04948553ef0089dee463f |
| Fixed in 5.18.3 with commit 6084240bfc44bf265ab6ae7d96980469b05be0f1 |
| Fixed in 5.19 with commit 3ba733f879c2a88910744647e41edeefbc0d92b2 |
| |
| 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-2022-49343 |
| 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/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/24b8206fec1db21d7e82f21f0b2ff5e5672cf5b3 |
| https://git.kernel.org/stable/c/b3ad9ff6f06c1dc6abf7437691c88ca3d6da3ac0 |
| https://git.kernel.org/stable/c/e157c8f87e8fac112d6c955e69a60cdb9bc80a60 |
| https://git.kernel.org/stable/c/ff4cafa51762da3824881a9000ca421d4b78b138 |
| https://git.kernel.org/stable/c/3a3ce941645407cd0b0b7f01ad9e2ea3770f46cc |
| https://git.kernel.org/stable/c/d5a16a6df2c16eaf4de04948553ef0089dee463f |
| https://git.kernel.org/stable/c/6084240bfc44bf265ab6ae7d96980469b05be0f1 |
| https://git.kernel.org/stable/c/3ba733f879c2a88910744647e41edeefbc0d92b2 |
