Out-of-bounds read in Linux kernel - CVE-2026-80557
Published: August 27, 2026
Vulnerability identifier: #VU145931
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80557
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information, execute arbitrary code, or cause a denial of service.
The vulnerability exists due to an out-of-bounds read in decode_watchers() when processing a crafted obj_list_watch_response_t reply with struct_len set to 0. A remote attacker can send a specially crafted OSD response to disclose sensitive information, execute arbitrary code, or cause a denial of service.
Exploitation requires a malicious or compromised OSD and can be triggered when a kernel client invokes CEPH_OSD_OP_LIST_WATCHERS.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-80557
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.107-1
linux (Debian package) - update to 6.12.107-1