{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-21737","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-12-29T08:45:45.756Z","datePublished":"2025-02-27T02:12:13.434Z","dateUpdated":"2025-10-01T19:36:42.012Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:20:04.910Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix memory leak in ceph_mds_auth_match()\n\nWe now free the temporary target path substring allocation on every\npossible branch, instead of omitting the default branch.  In some\ncases, a memory leak occured, which could rapidly crash the system\n(depending on how many file accesses were attempted).\n\nThis was detected in production because it caused a continuous memory\ngrowth, eventually triggering kernel OOM and completely hard-locking\nthe kernel.\n\nRelevant kmemleak stacktrace:\n\n    unreferenced object 0xffff888131e69900 (size 128):\n      comm \"git\", pid 66104, jiffies 4295435999\n      hex dump (first 32 bytes):\n        76 6f 6c 75 6d 65 73 2f 63 6f 6e 74 61 69 6e 65  volumes/containe\n        72 73 2f 67 69 74 65 61 2f 67 69 74 65 61 2f 67  rs/gitea/gitea/g\n      backtrace (crc 2f3bb450):\n        [<ffffffffaa68fb49>] __kmalloc_noprof+0x359/0x510\n        [<ffffffffc32bf1df>] ceph_mds_check_access+0x5bf/0x14e0 [ceph]\n        [<ffffffffc3235722>] ceph_open+0x312/0xd80 [ceph]\n        [<ffffffffaa7dd786>] do_dentry_open+0x456/0x1120\n        [<ffffffffaa7e3729>] vfs_open+0x79/0x360\n        [<ffffffffaa832875>] path_openat+0x1de5/0x4390\n        [<ffffffffaa834fcc>] do_filp_open+0x19c/0x3c0\n        [<ffffffffaa7e44a1>] do_sys_openat2+0x141/0x180\n        [<ffffffffaa7e4945>] __x64_sys_open+0xe5/0x1a0\n        [<ffffffffac2cc2f7>] do_syscall_64+0xb7/0x210\n        [<ffffffffac400130>] entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nIt can be triggered by mouting a subdirectory of a CephFS filesystem,\nand then trying to access files on this subdirectory with an auth token\nusing a path-scoped capability:\n\n    $ ceph auth get client.services\n    [client.services]\n            key = REDACTED\n            caps mds = \"allow rw fsname=cephfs path=/volumes/\"\n            caps mon = \"allow r fsname=cephfs\"\n            caps osd = \"allow rw tag cephfs data=cephfs\"\n\n    $ cat /proc/self/mounts\n    services@[REDACTED].cephfs=/volumes/containers /ceph/containers ceph rw,noatime,name=services,secret=<hidden>,ms_mode=prefer-crc,mount_timeout=300,acl,mon_addr=[REDACTED]:3300,recover_session=clean 0 0\n\n    $ seq 1 1000000 | xargs -P32 --replace={} touch /ceph/containers/file-{} && \\\n    seq 1 1000000 | xargs -P32 --replace={} cat /ceph/containers/file-{}\n\n[ idryomov: combine if statements, rename rc to path_matched and make\n            it a bool, formatting ]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ceph/mds_client.c"],"versions":[{"version":"596afb0b8933ba6ed7227adcc538db26feb25c74","lessThan":"146109fe936ac07f8f60cd6267543688985b96bc","status":"affected","versionType":"git"},{"version":"596afb0b8933ba6ed7227adcc538db26feb25c74","lessThan":"2b6086c5efe5c7bd6e0eb440d96c26ca0d20d9d7","status":"affected","versionType":"git"},{"version":"596afb0b8933ba6ed7227adcc538db26feb25c74","lessThan":"3b7d93db450e9d8ead80d75e2a303248f1528c35","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ceph/mds_client.c"],"versions":[{"version":"6.10","status":"affected"},{"version":"0","lessThan":"6.10","status":"unaffected","versionType":"semver"},{"version":"6.12.14","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.13.3","lessThanOrEqual":"6.13.*","status":"unaffected","versionType":"semver"},{"version":"6.14","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.13.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/146109fe936ac07f8f60cd6267543688985b96bc"},{"url":"https://git.kernel.org/stable/c/2b6086c5efe5c7bd6e0eb440d96c26ca0d20d9d7"},{"url":"https://git.kernel.org/stable/c/3b7d93db450e9d8ead80d75e2a303248f1528c35"}],"title":"ceph: fix memory leak in ceph_mds_auth_match()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-21737","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:31:13.857134Z"}}}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-401","description":"CWE-401 Missing Release of Memory after Effective Lifetime"}]}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-01T19:36:42.012Z"}}]}}