CVE-2026-53314

MediumCVSS 5.5/10Last modified Nov 6, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 894c9ef9780c5cf2f143415e867ee39a33ecb75d, < 65dae8b34f0810f3fa9f77c4c63650cd20820693; >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d, < a6d44f477000c6352de6b05e9e276e62083e5fbf; >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d, < 3e6c08dd97dcd22a00aee469e0adfa819071d80e; >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d, < 5a9f29a3e076b637d2234093e57989cf755ded5b; >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d, < 9afe53f14a2aae8c4beb30e5ea51641a34f1a3d3; >= 894c9ef9780c5cf2f143415e867ee39a33ecb75d, < c8c4a2972f83c8b68ff03b43cecdb898939ff851; 2b1207801c393a5e9af2fbac2dd8b0377d8ae63a; 0685dfa0a2ff7635c0b64f7b7f0fafbf1c3e0c14; 3f4d3d010477365ee1aefedc3ad52563740b777e; >= 4.19.202, < 4.20; >= 5.4.22, < 5.5; >= 5.5.6, < 5.6
LinuxLinux5.6

References

Timeline

Published
Jun 26, 2026
Last modified
Nov 6, 2026
NVD status
Analyzed

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CVE-2026-53314: Medium severity, CVSS 5.5 | Vulnix