| 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-2022-49413: bfq: Update cgroup information before merging bio |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bfq: Update cgroup information before merging bio |
| |
| When the process is migrated to a different cgroup (or in case of |
| writeback just starts submitting bios associated with a different |
| cgroup) bfq_merge_bio() can operate with stale cgroup information in |
| bic. Thus the bio can be merged to a request from a different cgroup or |
| it can result in merging of bfqqs for different cgroups or bfqqs of |
| already dead cgroups and causing possible use-after-free issues. Fix the |
| problem by updating cgroup information in bfq_merge_bio(). |
| |
| The Linux kernel CVE team has assigned CVE-2022-49413 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.4.198 with commit da9f3025d595956410ceaab2bea01980d7775948 |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.10.121 with commit b06691af08b41dfd81052a3362514d9827b44bb1 |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.15.46 with commit e8821f45612f2e6d9adb9c6ba0fb4184f57692aa |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.17.14 with commit d9165200c5627a2cf4408eefabdf0058bdf95e1a |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.18.3 with commit 2a1077f17169a6059992a0bbdb330e0abad1e6d9 |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.19 with commit ea591cd4eb270393810e7be01feb8fde6a34fbbe |
| |
| 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-2022-49413 |
| 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: |
| block/bfq-iosched.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/da9f3025d595956410ceaab2bea01980d7775948 |
| https://git.kernel.org/stable/c/b06691af08b41dfd81052a3362514d9827b44bb1 |
| https://git.kernel.org/stable/c/e8821f45612f2e6d9adb9c6ba0fb4184f57692aa |
| https://git.kernel.org/stable/c/d9165200c5627a2cf4408eefabdf0058bdf95e1a |
| https://git.kernel.org/stable/c/2a1077f17169a6059992a0bbdb330e0abad1e6d9 |
| https://git.kernel.org/stable/c/ea591cd4eb270393810e7be01feb8fde6a34fbbe |
