SB20261022531 - openEuler 22.03 LTS SP4 update for kernel

Description

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write (CVE-ID: CVE-2026-68278)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows an attacker with physical access to cause memory corruption.

The vulnerability exists due to out-of-bounds write in drm_dp_sideband_append_payload() when processing forged DP MST sideband reply messages from a connected device. An attacker with physical access can send crafted sideband reply data to cause memory corruption.

The issue is reachable from a DP MST device over a physical connection.

2) Improper locking (CVE-ID: CVE-2026-80855)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper locking in fuse_open() in fs/fuse/file.c when fuse_dax_break_layouts() fails after a signal interrupts the wait for busy DAX pages to drain during an O_TRUNC open of a DAX-enabled file. A local user can trigger the affected open operation to cause a denial of service.

The stale lock can stall later faults or truncates on the same file.

Remediation

Install update from vendor's website.

References

• https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-4436