Medium [CVE-2026-89765] Information disclosure in timers/itimer due to uninitialized padding
This medium-severity Red Hat Linux advisory covers CVE-2026-89765.
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Summary
A flaw was found in the Linux kernel's `timers/itimer` component. On native sparc64 systems, the `struct __kernel_old_timeval` contains uninitialized padding bytes.
When `put_itimerval()` copies this structure to userspace, these padding bytes can be exposed, leading to information disclosure. This vulnerability allows a local attacker to potentially read sensitive kernel memory.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H). Weakness: CWE-201.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 54 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 54 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 54 minutes ago·verify at source
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