Answer in brief
CVE-2026-89990 records a Critical severity (CVSS 9.8) vulnerability in ceph: lock mutex in ceph_mds_check_access(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=596afb0b8933ba6ed7227adcc538db26feb25c74 <729c1ff670ece6f3d4b1738365a0b2f90d487523 || >=596afb0b8933ba6ed7227adcc538db26feb25c74 <ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3 || >=596afb0b8933ba6ed7227adcc538db26feb25c74 <df1a97d5313fccadb08390306d49b194fb027392 || >=596afb0b8933ba6ed7227adcc538db26feb25c74 <a61c6ae1dae2611082b831b4aaa780878099c012 | 729c1ff670ece6f3d4b1738365a0b2f90d487523, ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3, df1a97d5313fccadb08390306d49b194fb027392, a61c6ae1dae2611082b831b4aaa780878099c012 |
| Linux/Linuxgeneric | 6.10 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
In the Linux kernel, the following vulnerability has been resolved: ceph: lock mutex in ceph_mds_check_access() MDS session OPEN handling replaces mdsc->s_cap_auths under mdsc->mutex, freeing the previous array and its strings. ceph_mds_check_access() traverses this array without holding the mutex. A concurrent session reopen can therefore free the array while it is being inspected, resulting in a use-after-free like this: Unable to handle kernel paging request at virtual address 003aaad64b2c8bb9 [...] Internal error: Oops: 0000000096000004 [#1] SMP Modules linked in: CPU: 56 UID: 2953037534 PID: 1253231 Comm: php-cgi8.4 Not tainted 6.18.45-i2-ampere #1146 NONE [..] pc : ceph_mds_check_access+0xd4/0x550 lr : ceph_mds_check_access+0xc8/0x550 [...] Call trace: ceph_mds_check_access+0xd4/0x550 (P) ceph_atomic_open+0x138/0xbe8 path_openat+0xa24/0xfa8 do_filp_open+0x94/0x158 do_sys_openat2+0x88/0xf8
Quoted source text, attributed separately from HOL analysis.