SB20260720162 - Missing Release of Resource after Effective Lifetime in Linux kernel powerpc perf

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-64070)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource management in sysfs show() callbacks in arch/powerpc/perf/hv-gpci.c when handling repeated sysfs reads. A local user can repeatedly read the affected sysfs entries to cause a denial of service.

On CONFIG_PREEMPT=y kernels, repeated successful reads can leave preemption disabled and a subsequent user-mode page fault may be forced to SIGSEGV, with the resulting coredump triggering a kernel scheduling while atomic condition.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/903409000a07ac8e31ffedeb8516f4f8d67150c8
• https://git.kernel.org/stable/c/dbc30a57bd8e026995e9fa8e8c31cffd18542c01