{ "cveId": "CVE-2025-21737", "url": "https://patchblox.com/security/cve/CVE-2025-21737", "summary": "CVE-2025-21737 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21737, released February 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: ceph: fix memory leak in ceph_mds_auth_match()...", "description": "In the Linux kernel, the following vulnerability has been resolved: ceph: fix memory leak in ceph_mds_auth_match() We now free the temporary target path substring allocation on every possible branch, instead of omitting the default branch. In some cases, a memory leak occured, which could rapidly crash the system (depending on how many file accesses were attempted). This was detected in production because it caused a continuous memory growth, eventually triggering kernel OOM and completely hard-locking the kernel. Relevant kmemleak stacktrace: unreferenced object 0xffff888131e69900 (size 128): comm \u0022git\u0022, pid 66104, jiffies 4295435999 hex dump (first 32 bytes): 76 6f 6c 75 6d 65 73 2f 63 6f 6e 74 61 69 6e 65 volumes/containe 72 73 2f 67 69 74 65 61 2f 67 69 74 65 61 2f 67 rs/gitea/gitea/g backtrace (crc 2f3bb450): [\u003Cffffffffaa68fb49\u003E] __kmalloc_noprof\u002B0x359/0x510 [\u003Cffffffffc32bf1df\u003E] ceph_mds_check_access\u002B0x5bf/0x14e0 [ceph] [\u003Cffffffffc3235722\u003E] ceph_open\u002B0x312/0xd80 [ceph] [\u003Cffffffffaa7dd786\u003E] do_dentry_open\u002B0x456/0x1120 [\u003Cffffffffaa7e3729\u003E] vfs_open\u002B0x79/0x360 [\u003Cffffffffaa832875\u003E] path_openat\u002B0x1de5/0x4390 [\u003Cffffffffaa834fcc\u003E] do_filp_open\u002B0x19c/0x3c0 [\u003Cffffffffaa7e44a1\u003E] do_sys_openat2\u002B0x141/0x180 [\u003Cffffffffaa7e4945\u003E] __x64_sys_open\u002B0xe5/0x1a0 [\u003Cffffffffac2cc2f7\u003E] do_syscall_64\u002B0xb7/0x210 [\u003Cffffffffac400130\u003E] entry_SYSCALL_64_after_hwframe\u002B0x77/0x7f It can be triggered by mouting a subdirectory of a CephFS filesystem, and then trying to access files on this subdirectory with an auth token using a path-scoped capability: $ ceph auth get client.services [client.services] key = REDACTED caps mds = \u0022allow rw fsname=cephfs path=/volumes/\u0022 caps mon = \u0022allow r fsname=cephfs\u0022 caps osd = \u0022allow rw tag cephfs data=cephfs\u0022 $ cat /proc/self/mounts services@[REDACTED].cephfs=/volumes/containers /ceph/containers ceph rw,noatime,name=services,secret=\u003Chidden\u003E,ms_mode=prefer-crc,mount_timeout=300,acl,mon_addr=[REDACTED]:3300,recover_session=clean 0 0 $ seq 1 1000000 | xargs -P32 --replace={} touch /ceph/containers/file-{} \u0026\u0026 \\ seq 1 1000000 | xargs -P32 --replace={} cat /ceph/containers/file-{} [ idryomov: combine if statements, rename rc to path_matched and make it a bool, formatting ]", "published": "2025-02-27T03:15:14Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00208, "epssPercentile": 0.1096, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", 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