| From bippy-7c5fe7eed585 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-2025-21898: ftrace: Avoid potential division by zero in function_stat_show() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ftrace: Avoid potential division by zero in function_stat_show() |
| |
| Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} |
| produce zero and skip stddev computation in that case. |
| |
| For now don't care about rec->counter * rec->counter overflow because |
| rec->time * rec->time overflow will likely happen earlier. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21898 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4.9 with commit f0629ee3922f10112584b1898491fecc74d98b3b and fixed in 5.4.291 with commit 5b3d32f607f0478b414b16516cf27f9170cf66c8 |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 5.10.235 with commit ca381f60a3bb7cfaa618d73ca411610bd7fc3149 |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 5.15.179 with commit 3d738b53ed6cddb68e68c9874520a4bf846163b5 |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 6.1.130 with commit 992775227843c9376773784b8b362add44592ad7 |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 6.6.81 with commit f58a3f8e284d0bdf94164a8e61cd4e70d337a1a3 |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 6.12.18 with commit 746cc474a95473591853927b3a9792a2d671155b |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 6.13.6 with commit 9cdac46fa7e854e587eb5f393fe491b6d7a9bdf6 |
| Issue introduced in 5.5 with commit e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d and fixed in 6.14 with commit a1a7eb89ca0b89dc1c326eeee2596f263291aca3 |
| Issue introduced in 3.16.83 with commit c59e74104cfd7df3ca0b5f59f1baee9c8c28b9ef |
| Issue introduced in 4.4.209 with commit 015f0fd0fcc338513f80044add27fa46cf71d217 |
| Issue introduced in 4.9.209 with commit 1a2985af2a20b816a5cc41a2ddc1c4109ef6b9c6 |
| Issue introduced in 4.14.163 with commit 7650b4b1df091815bbbbb837d308dd4154684f8a |
| Issue introduced in 4.19.94 with commit 010a7e846d4beaf34384c40ff18d5de10106d9b4 |
| |
| 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-2025-21898 |
| 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/trace/ftrace.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/5b3d32f607f0478b414b16516cf27f9170cf66c8 |
| https://git.kernel.org/stable/c/ca381f60a3bb7cfaa618d73ca411610bd7fc3149 |
| https://git.kernel.org/stable/c/3d738b53ed6cddb68e68c9874520a4bf846163b5 |
| https://git.kernel.org/stable/c/992775227843c9376773784b8b362add44592ad7 |
| https://git.kernel.org/stable/c/f58a3f8e284d0bdf94164a8e61cd4e70d337a1a3 |
| https://git.kernel.org/stable/c/746cc474a95473591853927b3a9792a2d671155b |
| https://git.kernel.org/stable/c/9cdac46fa7e854e587eb5f393fe491b6d7a9bdf6 |
| https://git.kernel.org/stable/c/a1a7eb89ca0b89dc1c326eeee2596f263291aca3 |
