| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-22125: md/raid1,raid10: don't ignore IO flags |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| md/raid1,raid10: don't ignore IO flags |
| |
| If blk-wbt is enabled by default, it's found that raid write performance |
| is quite bad because all IO are throttled by wbt of underlying disks, |
| due to flag REQ_IDLE is ignored. And turns out this behaviour exist since |
| blk-wbt is introduced. |
| |
| Other than REQ_IDLE, other flags should not be ignored as well, for |
| example REQ_META can be set for filesystems, clearing it can cause priority |
| reverse problems; And REQ_NOWAIT should not be cleared as well, because |
| io will wait instead of failing directly in underlying disks. |
| |
| Fix those problems by keep IO flags from master bio. |
| |
| Fises: f51d46d0e7cb ("md: add support for REQ_NOWAIT") |
| |
| The Linux kernel CVE team has assigned CVE-2025-22125 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.19 with commit 5404bc7a87b9949cf61e0174b21f80e73239ab25 and fixed in 6.14.2 with commit 8a0adf3d778c4a0893c6d34a9e1b0082a6f1c495 |
| Issue introduced in 2.6.19 with commit 5404bc7a87b9949cf61e0174b21f80e73239ab25 and fixed in 6.15 with commit e879a0d9cb086c8e52ce6c04e5bfa63825a6213c |
| |
| 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-2025-22125 |
| 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: |
| drivers/md/raid1.c |
| drivers/md/raid10.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/8a0adf3d778c4a0893c6d34a9e1b0082a6f1c495 |
| https://git.kernel.org/stable/c/e879a0d9cb086c8e52ce6c04e5bfa63825a6213c |
