| Name | CVE-2025-21694 |
| Description | In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone down, but they still happen sometimes. In a memory constrained environment like the kdump image, a softlockup is not just a harmless message, but it can interfere with things like RCU freeing memory, causing the crashdump to get stuck. The second loop in __read_vmcore has a lot more opportunities for natural sleep points, like scheduling out while waiting for a data write to happen, but apparently that is not always enough. Add a cond_resched() to the second loop in __read_vmcore to (hopefully) get rid of the softlockups. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4075-1, DLA-4076-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bullseye | 5.10.223-1 | vulnerable |
| bullseye (security) | 5.10.234-1 | fixed | |
| bookworm | 6.1.129-1 | fixed | |
| bookworm (security) | 6.1.133-1 | fixed | |
| trixie | 6.12.21-1 | fixed | |
| sid | 6.12.22-1 | fixed | |
| linux-6.1 (PTS) | bullseye (security) | 6.1.129-1~deb11u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bullseye | 5.10.234-1 | DLA-4075-1 | ||
| linux | source | bookworm | 6.1.128-1 | |||
| linux | source | (unstable) | 6.12.11-1 | |||
| linux-6.1 | source | bullseye | 6.1.128-1~deb11u1 | DLA-4076-1 |
https://git.kernel.org/linus/cbc5dde0a461240046e8a41c43d7c3b76d5db952 (6.13)