EDAC/mc: Fix error path ordering in edac_mc_alloc()
Résumé
EDAC/mc: Fix error path ordering in edac_mc_alloc()
Description d'origine
La description telle que publiée par la source (souvent en anglais).
In the Linux kernel, the following vulnerability has been resolved:
EDAC/mc: Fix error path ordering in edac_mc_alloc()
When the mci->pvt_info allocation in edac_mc_alloc() fails, the error path
will call put_device() which will end up calling the device's release
function.
However, the init ordering is wrong such that device_initialize() happens
after the failed allocation and thus the device itself and the release
function pointer are not initialized yet when they're called:
MCE: In-kernel MCE decoding enabled.
------------[ cut here ]------------
kobject: '(null)': is not initialized, yet kobject_put() is being called.
WARNING: lib/kobject.c:734 at kobject_put, CPU#22: systemd-udevd
CPU: 22 UID: 0 PID: 538 Comm: systemd-udevd Not tainted 7.0.0-rc1+ #2 PREEMPT(full)
RIP: 0010:kobject_put
Call Trace:
edac_mc_alloc+0xbe/0xe0 [edac_core]
amd64_edac_init+0x7a4/0xff0 [amd64_edac]
? __pfx_amd64_edac_init+0x10/0x10 [amd64_edac]
do_one_initcall
...
Reorder the calling sequence so that the device is initialized and thus the
release function pointer is properly set before it can be used.
This was found by Claude while reviewing another EDAC patch.
Paquets affectés
État des correctifs par distribution
Paquets corrigés publiés par chaque distribution pour cette CVE
- BellSoft Alpaquita BELL-CVE-2026-31689 linux-lts Corrigé dans: 6.1.170-r0
- Debian DEBIAN-CVE-2026-31689 linux Corrigé dans: 6.1.170-1
- Ubuntu UBUNTU-CVE-2026-31689 linux-hwe-edge
Références
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org