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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 ]
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.52% probability · 43th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73
- https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042
- https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f
- https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224
- https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6
- https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20
- https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555
- https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.