| 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-2022-48944: sched: Fix yet more sched_fork() races |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sched: Fix yet more sched_fork() races |
| |
| Where commit 4ef0c5c6b5ba ("kernel/sched: Fix sched_fork() access an |
| invalid sched_task_group") fixed a fork race vs cgroup, it opened up a |
| race vs syscalls by not placing the task on the runqueue before it |
| gets exposed through the pidhash. |
| |
| Commit 13765de8148f ("sched/fair: Fix fault in reweight_entity") is |
| trying to fix a single instance of this, instead fix the whole class |
| of issues, effectively reverting this commit. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48944 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15.3 with commit 3869eecf050416a1d19bac60926f6b5d64b0aa58 and fixed in 5.15.27 with commit 3411613611a5cddf7e80908010dc87cb527dd13b |
| Issue introduced in 5.16 with commit 4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a and fixed in 5.16.13 with commit c65cfd89cef669d90c59f3bf150af6458137a04f |
| Issue introduced in 5.16 with commit 4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a and fixed in 5.17 with commit b1e8206582f9d680cff7d04828708c8b6ab32957 |
| Issue introduced in 5.10.80 with commit c85c6fadbef0a3eab41540ea628fa8fe8928c820 |
| Issue introduced in 5.14.19 with commit 25d40b828fb855ee62e1039c65a666c9afd60786 |
| |
| 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-2022-48944 |
| 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: |
| include/linux/sched/task.h |
| kernel/fork.c |
| kernel/sched/core.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/3411613611a5cddf7e80908010dc87cb527dd13b |
| https://git.kernel.org/stable/c/c65cfd89cef669d90c59f3bf150af6458137a04f |
| https://git.kernel.org/stable/c/b1e8206582f9d680cff7d04828708c8b6ab32957 |
