SB2026082777 - Out-of-bounds read in Linux kernel ceph

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-80557)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/00ead17c7de137a692edee59f2772e6af687e8eb
• https://git.kernel.org/stable/c/7130d94846dadbb97b6b7f4d78a3a7bba6e3daa1