| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm thin: make get_first_thin use rcu-safe list first function\n\nThe documentation in rculist.h explains the absence of list_empty_rcu()\nand cautions programmers against relying on a list_empty() ->\nlist_first() sequence in RCU safe code. This is because each of these\nfunctions performs its own READ_ONCE() of the list head. This can lead\nto a situation where the list_empty() sees a valid list entry, but the\nsubsequent list_first() sees a different view of list head state after a\nmodification.\n\nIn the case of dm-thin, this author had a production box crash from a GP\nfault in the process_deferred_bios path. This function saw a valid list\nhead in get_first_thin() but when it subsequently dereferenced that and\nturned it into a thin_c, it got the inside of the struct pool, since the\nlist was now empty and referring to itself. The kernel on which this\noccurred printed both a warning about a refcount_t being saturated, and\na UBSAN error for an out-of-bounds cpuid access in the queued spinlock,\nprior to the fault itself. When the resulting kdump was examined, it\nwas possible to see another thread patiently waiting in thin_dtr's\nsynchronize_rcu.\n\nThe thin_dtr call managed to pull the thin_c out of the active thins\nlist (and have it be the last entry in the active_thins list) at just\nthe wrong moment which lead to this crash.\n\nFortunately, the fix here is straight forward. Switch get_first_thin()\nfunction to use list_first_or_null_rcu() which performs just a single\nREAD_ONCE() and returns NULL if the list is already empty.\n\nThis was run against the devicemapper test suite's thin-provisioning\nsuites for delete and suspend and no regressions were observed." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/md/dm-thin.c" |
| ], |
| "versions": [ |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "ec037fe8c0d0f6140e3d8a49c7b29cb5582160b8", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "cd30a3960433ec2db94b3689752fa3c5df44d649", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "802666a40c71a23542c43a3f87e3a2d0f4e8fe45", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "12771050b6d059eea096993bf2001da9da9fddff", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "6b305e98de0d225ccebfb225730a9f560d28ecb0", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "cbd0d5ecfa390ac29c5380200147d09c381b2ac6", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "b10ebd34cccae1b431caf1be54919aede2be7cbe", |
| "lessThan": "80f130bfad1dab93b95683fc39b87235682b8f72", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "drivers/md/dm-thin.c" |
| ], |
| "versions": [ |
| { |
| "version": "3.15", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "3.15", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.290", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.234", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.177", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.1.125", |
| "lessThanOrEqual": "6.1.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.6.72", |
| "lessThanOrEqual": "6.6.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12.10", |
| "lessThanOrEqual": "6.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.13", |
| "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": "3.15", |
| "versionEndExcluding": "5.4.290" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "3.15", |
| "versionEndExcluding": "5.10.234" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "3.15", |
| "versionEndExcluding": "5.15.177" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "3.15", |
| "versionEndExcluding": "6.1.125" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "3.15", |
| "versionEndExcluding": "6.6.72" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "3.15", |
| "versionEndExcluding": "6.12.10" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "3.15", |
| "versionEndExcluding": "6.13" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/ec037fe8c0d0f6140e3d8a49c7b29cb5582160b8" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cd30a3960433ec2db94b3689752fa3c5df44d649" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/802666a40c71a23542c43a3f87e3a2d0f4e8fe45" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/12771050b6d059eea096993bf2001da9da9fddff" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/6b305e98de0d225ccebfb225730a9f560d28ecb0" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/cbd0d5ecfa390ac29c5380200147d09c381b2ac6" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/80f130bfad1dab93b95683fc39b87235682b8f72" |
| } |
| ], |
| "title": "dm thin: make get_first_thin use rcu-safe list first function", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2025-21664", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
