| 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-2025-21726: padata: avoid UAF for reorder_work |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| padata: avoid UAF for reorder_work |
| |
| Although the previous patch can avoid ps and ps UAF for _do_serial, it |
| can not avoid potential UAF issue for reorder_work. This issue can |
| happen just as below: |
| |
| crypto_request crypto_request crypto_del_alg |
| padata_do_serial |
| ... |
| padata_reorder |
| // processes all remaining |
| // requests then breaks |
| while (1) { |
| if (!padata) |
| break; |
| ... |
| } |
| |
| padata_do_serial |
| // new request added |
| list_add |
| // sees the new request |
| queue_work(reorder_work) |
| padata_reorder |
| queue_work_on(squeue->work) |
| ... |
| |
| <kworker context> |
| padata_serial_worker |
| // completes new request, |
| // no more outstanding |
| // requests |
| |
| crypto_del_alg |
| // free pd |
| |
| <kworker context> |
| invoke_padata_reorder |
| // UAF of pd |
| |
| To avoid UAF for 'reorder_work', get 'pd' ref before put 'reorder_work' |
| into the 'serial_wq' and put 'pd' ref until the 'serial_wq' finish. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21726 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 5.10.235 with commit f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0 |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 5.15.179 with commit 4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1 |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 6.1.129 with commit 7000507bb0d2ceb545c0a690e0c707c897d102c2 |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 6.6.76 with commit 6f45ef616775b0ce7889b0f6077fc8d681ab30bc |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 6.12.13 with commit 8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 6.13.2 with commit a54091c24220a4cd847d5b4f36d678edacddbaf0 |
| Issue introduced in 5.6 with commit bbefa1dd6a6d53537c11624752219e39959d04fb and fixed in 6.14 with commit dd7d37ccf6b11f3d95e797ebe4e9e886d0332600 |
| Issue introduced in 5.4.19 with commit b4c8ed0bf977760a206997b6429a7ac91978f440 |
| Issue introduced in 5.5.3 with commit e43d65719527043f1ef79ecba9d4ede58cbc7ffe |
| |
| 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-2025-21726 |
| 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: |
| kernel/padata.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/f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0 |
| https://git.kernel.org/stable/c/4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1 |
| https://git.kernel.org/stable/c/7000507bb0d2ceb545c0a690e0c707c897d102c2 |
| https://git.kernel.org/stable/c/6f45ef616775b0ce7889b0f6077fc8d681ab30bc |
| https://git.kernel.org/stable/c/8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac |
| https://git.kernel.org/stable/c/a54091c24220a4cd847d5b4f36d678edacddbaf0 |
| https://git.kernel.org/stable/c/dd7d37ccf6b11f3d95e797ebe4e9e886d0332600 |
