CVE-2026-53314

Description

In the Linux kernel, the following vulnerability has been resolved: padata: Put CPU offline callback in ONLINE section to allow failure syzbot reported the following warning: DEAD callback error for CPU1 WARNING: kernel/cpu.c:1463 at _cpu_down+0x759/0x1020 kernel/cpu.c:1463, CPU#0: syz.0.1960/14614 at commit 4ae12d8bd9a8 ("Merge tag 'kbuild-fixes-7.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux") which tglx traced to padata_cpu_dead() given it's the only sub-CPUHP_TEARDOWN_CPU callback that returns an error. Failure isn't allowed in hotplug states before CPUHP_TEARDOWN_CPU so move the CPU offline callback to the ONLINE section where failure is possible.

References

• https://git.kernel.org/stable/c/3e6c08dd97dcd22a00aee469e0adfa819071d80e
• https://git.kernel.org/stable/c/5a9f29a3e076b637d2234093e57989cf755ded5b
• https://git.kernel.org/stable/c/65dae8b34f0810f3fa9f77c4c63650cd20820693
• https://git.kernel.org/stable/c/9afe53f14a2aae8c4beb30e5ea51641a34f1a3d3
• https://git.kernel.org/stable/c/a6d44f477000c6352de6b05e9e276e62083e5fbf