Medium [CVE-2026-89722] Linux kernel: Out-of-bounds read in PCI/sysfs via improper handling of write buffer size
This medium-severity Red Hat Linux advisory covers CVE-2026-89722.
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Summary
A flaw was found in the Linux kernel's PCI/sysfs component. A local user with root privileges could trigger an out-of-bounds read in the `pci_write_legacy_io()` function by writing to the `legacy_io` sysfs file with a size less than four bytes.
This improper handling of the write buffer can lead to memory corruption, potentially allowing for information disclosure or other system instability. On little-endian PowerPC systems, this could also result in an out-of-bounds write.
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H). Weakness: CWE-125.
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 43 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 43 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 43 minutes ago·verify at source
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