CVE-2026-89722Medium· 5.5▾ SunlitA 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 b…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 4.7
none → medium
— → 4.7
none → medium
Last analysed / modified upstream
— → 4.7
none → medium
4.7 → 5.5
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.
kernel: PCI/sysfs: Fix out-of-bounds read in pci_write_legacy_io() — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.
Affected:
No fix planned:
Out of support scope
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-80985High· 7.0kernel: net/smc: carry oversized SMC-Rv2 LLC messages in the queue entry (CVE-2026-80985)
CVE-2026-89691High· 7.0kernel: nfsd: clear opcnt on compound arg release to prevent OOB read (CVE-2026-89691)
CVE-2026-80969Medium· 5.5kernel: ALSA: mpu401: Check card index validity at probe (CVE-2026-80969)
CVE-2026-80972Medium· 5.5kernel: ALSA: aloop: Check card index validity at probe (CVE-2026-80972)
CVE-2026-80973High· 7.0kernel: ALSA: 6fire: bound the MIDI event length from the device (CVE-2026-80973)
CVE-2026-80976High· 7.0kernel: seg6: reset IP6CB after IPv6 decapsulation (CVE-2026-80976)