{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-47668", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-30T16:00:12.936Z", "datePublished": "2024-10-09T14:14:00.189Z", "dateUpdated": "2026-08-05T11:39:17.526Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:39:17.526Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()\n\nIf we need to increase the tree depth, allocate a new node, and then\nrace with another thread that increased the tree depth before us, we'll\nstill have a preallocated node that might be used later.\n\nIf we then use that node for a new non-root node, it'll still have a\npointer to the old root instead of being zeroed - fix this by zeroing it\nin the cmpxchg failure path." } ], "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 only genradix users with lock-free concurrent `__genradix_ptr_alloc()` on a shared tree are bcachefs (`bch2_quota_acct()` on the write/inode-create path, `__ec_stripe_mem_alloc()` in erasure coding), reached via ordinary local filesystem syscalls; SCTP's per-association trees are serialized under the socket lock and `fs/proc/base.c` uses a stack-local tree, so no remote path exists.\nAC:L - The attacker drives both sides of the race with their own threads — concurrent writes/creates from multiple tasks each call `genradix_ptr_alloc()` outside `q->lock`, and the depth-increase point is deterministic (first access beyond current tree capacity), so it can be targeted and retried at will.\nPR:L - No capability is required: any unprivileged local user with write access on a mounted bcachefs volume triggers `bch2_quota_acct()`/stripe allocation through plain `write()`, `creat()`, and `chown()`, and reads the resulting corrupted counter back via `quotactl(Q_GETQUOTA)` for their own id.\nUI:N - The attacker's own concurrent threads perform every step; no victim action is needed once the filesystem is mounted as part of normal system operation.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A dirty node used as a leaf leaves a live kernel heap pointer where zeros are guaranteed, and for bcachefs quotas that value is returned to unprivileged userspace as `d_space` via `quotactl(Q_GETQUOTA)`; the interior-node aliasing additionally exposes unrelated tree contents and gives a read primitive over corrupted pointers.\nI:H - When the dirty node is installed at an interior level, two distinct indices alias onto the same node, so attacker-controlled u64 counter data overwrites live `children[]` pointers of a node still in the tree — a controlled write over kernel pointers that are later dereferenced and freed.\nA:H - The aliased node is reachable twice from `genradix_free_recurse()`, producing a double `kfree()` of a 512-byte slab object plus `kfree()` of fabricated pointer values, and corrupted quota counters directly trip `BUG_ON()` in `__bch2_quota_transfer()`/`__bch2_quota_reservation_put()` — all kernel panics." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/generic-radix-tree.c" ], "versions": [ { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "0f27f4f445390cb7f73d4209cb2bf32834dc53da", "status": "affected", "versionType": "git" }, { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "99418ec776a39609f50934720419e0b464ca2283", "status": "affected", "versionType": "git" }, { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169", "status": "affected", "versionType": "git" }, { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "ebeff038744c498a036e7a92eb8e433ae0a386d7", "status": "affected", "versionType": "git" }, { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "d942e855324a60107025c116245095632476613e", "status": "affected", "versionType": "git" }, { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "0f078f8ca93b28a34e20bd050f12cd4efeee7c0f", "status": "affected", "versionType": "git" }, { "version": "ba20ba2e3743bac786dff777954c11930256075e", "lessThan": "b2f11c6f3e1fc60742673b8675c95b78447f3dae", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/generic-radix-tree.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.284", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.226", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.167", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.110", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.51", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.10", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "5.1", "versionEndExcluding": "5.4.284" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.10.226" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.1.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.10.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0f27f4f445390cb7f73d4209cb2bf32834dc53da" }, { "url": "https://git.kernel.org/stable/c/99418ec776a39609f50934720419e0b464ca2283" }, { "url": "https://git.kernel.org/stable/c/ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169" }, { "url": "https://git.kernel.org/stable/c/ebeff038744c498a036e7a92eb8e433ae0a386d7" }, { "url": "https://git.kernel.org/stable/c/d942e855324a60107025c116245095632476613e" }, { "url": "https://git.kernel.org/stable/c/0f078f8ca93b28a34e20bd050f12cd4efeee7c0f" }, { "url": "https://git.kernel.org/stable/c/b2f11c6f3e1fc60742673b8675c95b78447f3dae" } ], "title": "lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-10-10T13:21:11.227741Z", "id": "CVE-2024-47668", "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": "2024-10-10T13:21:24.795Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:20:33.256Z" } } ] } }