CVE-2026-80558: Linux Vulnerability (CVSS 9.8)

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: Avoid using invalid osd indices from primary_temp A corrupted osdmap received from a Ceph monitor or OSD may contain osd indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts that don't exist, i.e., that are greater than max_osd or smaller than CEPH_HOMELESS_OSD (-1). These indices are used to create the up and acting set in ceph_pg_to_up_acting_osds(), called from calc_target(). While most of these osd indices are checked, the one from primary_temp is not. Subsequently, this may lead to calc_target() returning this (potentially invalid) index as target osd for a (linger) request. Because the osd_state, osd_weight, and osd_addr arrays only contain max_osd entries (with indices 0 to max_osd -1), this leads to out-of-bounds accesses when trying to read values from these arrays. This patch fixes the issue by adding a check to get_temp_osds(), so that only valid osd indices from primary_temp are used, and it falls back to using the primary from pg_temp or the up set if it is invalid. [ idryomov: changelog ]

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 5e8d4d36bf23bb7baf027c479d54395840219928, < 505fc50b8ff8e687b7e3ef6866269dea27366224; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < 1c705fe8e59c6b16f48964973fb23c8ec4735b73; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < dfe1877d351b99eb1b1a62a3fc2d174220e88e20; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < e2ffeec85201b2bb748e99e12539ee1b92f62796; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < 6799d4a916ffcb3d450d8440f9fe0f0862f768d6; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < 4f392fec075562dc93bb0c69f37423ca2af9b48f; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < e009c5f0ad634c62f5c48a41f1f3c019ecf52555; >= 5e8d4d36bf23bb7baf027c479d54395840219928, < 3660b98d1204b419f6a77e9a295f148dcf38d042
Linux	Linux	3.15

References

Timeline

Published: Aug 26, 2026
Last Modified: Aug 27, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-80558?

In the Linux kernel, the following vulnerability has been resolved: libceph: Avoid using invalid osd indices from primary_temp A corrupted osdmap received from a Ceph monitor or OSD may contain osd indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts that don't exist, i.e., that are greater than max_osd or smaller than CEPH_HOMELESS_OSD (-1). These indices are used to create the up and acting set in ceph_pg_to_up_acting_osds(), called from calc_target(). While most of these osd indices are checked, the one from primary_temp is not. Subsequently, this may lead to calc_target() returning this (potentially invalid) index as target osd for a (linger) request. Because the osd_state, osd_weight, and osd_addr arrays only contain max_osd entries (with indices 0 to max_osd -1), this leads to out-of-bounds accesses when trying to read values from these arrays. This patch fixes the issue by adding a check to get_temp_osds(), so that only valid osd indices from primary_temp are used, and it falls back to using the primary from pg_temp or the up set if it is invalid. [ idryomov: changelog ]

How severe is CVE-2026-80558?

CVE-2026-80558 has a CVSS score of 9.8/10 (CRITICAL severity).

How do I fix CVE-2026-80558?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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