UBUNTU-CVE-2026-64226
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error() dereferences p->comm and p->pid. If the iterator's reference is the last drop, the task is freed synchronously and the deref becomes a UAF. Move put_task_struct() past scx_error().
02 / AFFECTED SOFTWARE
Affected packages
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43 explicit affected versions
16 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error() dereferences p->comm and p->pid. If the iterator's reference is the last drop, the task is freed synchronously and the deref becomes a UAF. Move put_task_struct() past scx_error().
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/9a415cc53711f2238e0f0ca8a6bcc796c003b127
- https://git.kernel.org/stable/c/45c7c4e3db8b700307313c035ea08be829a7f21b
- https://git.kernel.org/stable/c/57e19ba3f58a67eb924022a5a60b67fd08e5cbbd
- https://git.kernel.org/stable/c/9a415cc53711f2238e0f0ca8a6bcc796c003b127
- https://git.kernel.org/stable/c/cf396941901858b0de426cdcd3974eea6a02c98c
- https://ubuntu.com/security/CVE-2026-64226
- https://ubuntu.com/security/notices/USN-8618-1
- https://www.cve.org/CVERecord?id=CVE-2026-64226