| 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-2022-49411: bfq: Make sure bfqg for which we are queueing requests is online |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bfq: Make sure bfqg for which we are queueing requests is online |
| |
| Bios queued into BFQ IO scheduler can be associated with a cgroup that |
| was already offlined. This may then cause insertion of this bfq_group |
| into a service tree. But this bfq_group will get freed as soon as last |
| bio associated with it is completed leading to use after free issues for |
| service tree users. Fix the problem by making sure we always operate on |
| online bfq_group. If the bfq_group associated with the bio is not |
| online, we pick the first online parent. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49411 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.4.198 with commit ccddf8cd411c1800863ed357064e56ceffd356bb |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.10.121 with commit 51f724bffa3403a5236597e6b75df7329c1ec6e9 |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.15.46 with commit 6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.17.14 with commit 97bd6c56bdcb41079e488e31df56809e3b2ce628 |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.18.3 with commit 7781c38552e6cc54ed8e9040279561340516b881 |
| Issue introduced in 4.12 with commit e21b7a0b988772e82e7147e1c659a5afe2ae003c and fixed in 5.19 with commit 075a53b78b815301f8d3dd1ee2cd99554e34f0dd |
| |
| 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-2022-49411 |
| 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-cgroup.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/ccddf8cd411c1800863ed357064e56ceffd356bb |
| https://git.kernel.org/stable/c/51f724bffa3403a5236597e6b75df7329c1ec6e9 |
| https://git.kernel.org/stable/c/6ee0868b0c3ccead5907685fcdcdd0c08dfe4b0b |
| https://git.kernel.org/stable/c/97bd6c56bdcb41079e488e31df56809e3b2ce628 |
| https://git.kernel.org/stable/c/7781c38552e6cc54ed8e9040279561340516b881 |
| https://git.kernel.org/stable/c/075a53b78b815301f8d3dd1ee2cd99554e34f0dd |
