| 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-2025-21817: block: mark GFP_NOIO around sysfs ->store() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| block: mark GFP_NOIO around sysfs ->store() |
| |
| sysfs ->store is called with queue freezed, meantime we have several |
| ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate |
| memory with GFP_KERNEL which may run into direct reclaim code path, |
| then potential deadlock can be caused. |
| |
| Fix the issue by marking NOIO around sysfs ->store() |
| |
| The Linux kernel CVE team has assigned CVE-2025-21817 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.13.3 with commit 2566ce907e5d5db8a039647208e029ce559baa31 |
| Fixed in 6.14 with commit 7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c |
| |
| 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-2025-21817 |
| 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/blk-sysfs.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/2566ce907e5d5db8a039647208e029ce559baa31 |
| https://git.kernel.org/stable/c/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c |
