In the Linux kernel, the following vulnerability has been resolved: padata: Put CPU offline callback in ONLINE section to allow failure syzbot… (CVE-2026-53314)
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.
AI Analysis
Technical Summary
The Linux kernel had a vulnerability where the CPU offline callback was placed in a section that did not allow failure, causing a DEAD callback error during CPU hotplug operations. Specifically, the padata_cpu_dead() callback returned an error in a state where failure was not permitted, leading to potential kernel instability or CPU offline failures. The resolution involved moving the CPU offline callback to the ONLINE section, where failure is allowed, thus preventing the error. This fix was introduced in commit 4ae12d8bd9a8 as part of kbuild fixes for kernel version 7.0-2.
Potential Impact
This vulnerability can cause a denial of service condition by triggering a DEAD callback error during CPU hotplug operations, impacting system availability. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel as part of commit 4ae12d8bd9a8 (kbuild-fixes-7.0-2). Users should update to a kernel version that includes this commit to remediate the issue. Since this is not a cloud service, manual patching or kernel upgrade is required. Patch status is confirmed by the vendor commit referenced.
In the Linux kernel, the following vulnerability has been resolved: padata: Put CPU offline callback in ONLINE section to allow failure syzbot… (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.
CVSS v3.1
Score 5.5medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel had a vulnerability where the CPU offline callback was placed in a section that did not allow failure, causing a DEAD callback error during CPU hotplug operations. Specifically, the padata_cpu_dead() callback returned an error in a state where failure was not permitted, leading to potential kernel instability or CPU offline failures. The resolution involved moving the CPU offline callback to the ONLINE section, where failure is allowed, thus preventing the error. This fix was introduced in commit 4ae12d8bd9a8 as part of kbuild fixes for kernel version 7.0-2.
Potential Impact
This vulnerability can cause a denial of service condition by triggering a DEAD callback error during CPU hotplug operations, impacting system availability. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel as part of commit 4ae12d8bd9a8 (kbuild-fixes-7.0-2). Users should update to a kernel version that includes this commit to remediate the issue. Since this is not a cloud service, manual patching or kernel upgrade is required. Patch status is confirmed by the vendor commit referenced.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4fpm-3x7p-95xm
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-53314"]
- Ecosystems
- []
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a4c33fd27e9c797195f283b
Added to database: 07/06/2026, 23:02:21 UTC
Last enriched: 07/06/2026, 23:09:31 UTC
Last updated: 07/31/2026, 19:24:49 UTC
Views: 5
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