{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68153", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.371Z", "datePublished": "2026-08-10T11:59:19.302Z", "dateUpdated": "2026-08-19T16:30:18.048Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:30:18.048Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc->monmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires local access to debugfs via read() on /sys/kernel/debug/ceph/client*/monmap concurrent with local ceph client teardown via umount or rbd unmap; the bug is not reachable through Ceph network protocol handlers.\nAC:L - The attacker controls both sides of the race by concurrently reading the monmap debugfs file while triggering ceph_destroy_client() via umount/rbd teardown, and can retry until the window between ceph_monc_stop() and debugfs removal is hit.\nPR:L - An unprivileged local user can use user-namespace capabilities (CAP_DAC_READ_SEARCH) to read root-owned debugfs files and race reads against libceph client teardown during automated volume detach or service restarts on Ceph storage nodes.\nUI:N - No victim user interaction is required; a local attacker can independently issue debugfs reads and trigger or time against client teardown without requiring another user to click, open files, or mount filesystems.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross VM, container, or IOMMU boundaries; impact is standard kernel privilege escalation or crash.\nC:H - The use-after-free on monc->monmap permits reading freed heap memory containing monitor addresses and entity metadata, and UAF primitives are routinely leveraged for arbitrary kernel memory disclosure.\nI:H - Heap use-after-free on the variable-length ceph_monmap structure enables memory corruption that can be groomed into arbitrary kernel write primitives and local privilege escalation via control-flow hijacking.\nA:H - Concurrent access to freed monmap memory during debugfs iteration can cause kernel oops, BUG, or panic, and UAF corruption reliably threatens system availability even when full exploitation is not attempted." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/ceph_common.c" ], "versions": [ { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "ac78549d186090ee7125d28c3a8c376573b36194", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "463a264e9094384112a5c8b46f0a9ddaf8566904", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "fe46b7e06f14f6f94766832df309b249cb689d27", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "fc1010e7e0204ece6cc0f9af4f473e9553535eab", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "d3dc8889d39a676bf840132bd5c5c48cb0daba23", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "8f5a3abc54ba24dbceb14cc3a719908c4f688091", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "b9fedda2f628e030384228de0dafc574b7fb0c2f", "status": "affected", "versionType": "git" }, { "version": "76aa844d5b2fb8c839180d3f5874e333b297e5fd", "lessThan": "e4c804726c4afce3ba648b982d564f6af2cfa328", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/ceph_common.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "2.6.34", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ac78549d186090ee7125d28c3a8c376573b36194" }, { "url": "https://git.kernel.org/stable/c/463a264e9094384112a5c8b46f0a9ddaf8566904" }, { "url": "https://git.kernel.org/stable/c/fe46b7e06f14f6f94766832df309b249cb689d27" }, { "url": "https://git.kernel.org/stable/c/fc1010e7e0204ece6cc0f9af4f473e9553535eab" }, { "url": "https://git.kernel.org/stable/c/d3dc8889d39a676bf840132bd5c5c48cb0daba23" }, { "url": "https://git.kernel.org/stable/c/8f5a3abc54ba24dbceb14cc3a719908c4f688091" }, { "url": "https://git.kernel.org/stable/c/b9fedda2f628e030384228de0dafc574b7fb0c2f" }, { "url": "https://git.kernel.org/stable/c/e4c804726c4afce3ba648b982d564f6af2cfa328" } ], "title": "libceph: remove debugfs files before client teardown", "x_generator": { "engine": "bippy-1.2.0" } } } }