CVE-2026-89990

CVE CVE-2026-89990EUVD EUVD-2026-80598Published 2026-09-16T10:33:04.000ZLast changed 2026-09-16T14:41:05.000ZCVSS 9.8

What the advisory describes

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

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.2.5; patch: 0; 596afb0b8933ba6ed7227adcc538db26feb25c74 <a61c6ae1dae2611082b831b4aaa780878099c012; 596afb0b8933ba6ed7227adcc538db26feb25c74 <729c1ff670ece6f3d4b1738365a0b2f90d487523; 6.10; patch: 7.3-rc2; patch: 6.18.51; patch: 6.12.110; 596afb0b8933ba6ed7227adcc538db26feb25c74 <df1a97d5313fccadb08390306d49b194fb027392; 596afb0b8933ba6ed7227adcc538db26feb25c74 <ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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