{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27058", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.214Z", "datePublished": "2024-05-01T13:00:06.852Z", "dateUpdated": "2026-08-05T11:29:17.454Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:17.454Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntmpfs: fix race on handling dquot rbtree\n\nA syzkaller reproducer found a race while attempting to remove dquot\ninformation from the rb tree.\n\nFetching the rb_tree root node must also be protected by the\ndqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot()\nwill trigger a warning because it couldn't find a node in the tree, when\nthe real reason was the root node changing before the search starts:\n\nThread 1\t\t\t\tThread 2\n- shmem_release_dquot()\t\t\t- shmem_{acquire,release}_dquot()\n\n- fetch ROOT\t\t\t\t- Fetch ROOT\n\n\t\t\t\t\t- acquire dqio_sem\n- wait dqio_sem\n\n\t\t\t\t\t- do something, triger a tree rebalance\n\t\t\t\t\t- release dqio_sem\n\n- acquire dqio_sem\n- start searching for the node, but\n from the wrong location, missing\n the node, and triggering a warning." } ], "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 - The vulnerable code is reached through local filesystem operations (create/chgrp/unlink) on a quota-enabled tmpfs and through the quotactl syscall; there is no network-facing path.\nAC:L - The attacker controls both sides of the race — spawning concurrent threads that force rb-tree insertions/rotations via dquot_initialize()/dquot_transfer() while the quota release worker walks the tree from its stale root — and the window spans two blocking lock acquisitions (dq_lock, then dqio_sem) that the attacker can widen by contending dqio_sem; a syzkaller reproducer exists.\nPR:L - Only an unprivileged local user with write access to the quota-enabled tmpfs is needed, since shmem_acquire_dquot()/shmem_release_dquot() run on ordinary inode creation and chown/chgrp with no capability check; enabling quota at mount time is an administrator-side deployment precondition, not an attacker privilege.\nUI:N - The attacker triggers the race entirely from their own processes doing normal file operations; no action by any other user is required.\nS:U - The corruption and crash are confined to the kernel's own memory and the tmpfs quota subsystem, with no crossing into another security authority such as a hypervisor or IOMMU boundary.\nC:H - Because the root is fetched outside dqio_sem, the traversal can continue into a quota_id object that a concurrent shmem_release_dquot() already rb_erase()d and kfree()d, reading entry->id and following rb_left/rb_right out of freed kmalloc-64 memory that can be groomed with attacker data, and via Q_GETNEXTQUOTA that freed content is returned to userspace as a qid.\nI:H - After following stale/freed tree pointers the found: path stores four attacker-influenced 64-bit limit values into the located \"entry\", then rb_erase()s and kfree()s it, giving writes and a free against a reallocated heap object — heap corruption exploitable beyond a simple crash.\nA:H - The race reliably triggers WARN_ONCE() in shmem_release_dquot() (a panic under panic_on_warn) and returns -ENOENT with DQ_ACTIVE_B still set, so quota_release_workfn() restarts on the same dquot and can spin, stalling all quota releases and blocking flush_delayed_work()/quotaoff/umount; the unlocked info->dqi_priv deref in shmem_get_next_id() also NULL-derefs before its sb_has_quota_active() check." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/shmem_quota.c" ], "versions": [ { "version": "eafc474e202978ac735c551d5ee1eb8c02e2be54", "lessThan": "c7077f43f30d817d10a9f8245e51576ac114b2f0", "status": "affected", "versionType": "git" }, { "version": "eafc474e202978ac735c551d5ee1eb8c02e2be54", "lessThan": "617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb", "status": "affected", "versionType": "git" }, { "version": "eafc474e202978ac735c551d5ee1eb8c02e2be54", "lessThan": "f82f184874d2761ebaa60dccf577921a0dbb3810", "status": "affected", "versionType": "git" }, { "version": "eafc474e202978ac735c551d5ee1eb8c02e2be54", "lessThan": "0a69b6b3a026543bc215ccc866d0aea5579e6ce2", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/shmem_quota.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.24", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.12", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.3", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "6.6", "versionEndExcluding": "6.6.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.7.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.8.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0" }, { "url": "https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb" }, { "url": "https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810" }, { "url": "https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2" } ], "title": "tmpfs: fix race on handling dquot rbtree", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "HIGH", "confidentialityImpact": "LOW" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-05-17T15:12:32.083830Z", "id": "CVE-2024-27058", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-01T17:11:16.996Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:21:05.876Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/c7077f43f30d817d10a9f8245e51576ac114b2f0", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/f82f184874d2761ebaa60dccf577921a0dbb3810", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2", "tags": [ "x_transferred" ] } ] } ] } }