193 lines
10 KiB
JSON
193 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-47676",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-09-30T16:00:12.938Z",
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"datePublished": "2024-10-21T11:53:20.482Z",
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"dateUpdated": "2026-08-05T11:39:22.950Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:39:22.950Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb.c: fix UAF of vma in hugetlb fault pathway\n\nSyzbot reports a UAF in hugetlb_fault(). This happens because\nvmf_anon_prepare() could drop the per-VMA lock and allow the current VMA\nto be freed before hugetlb_vma_unlock_read() is called.\n\nWe can fix this by using a modified version of vmf_anon_prepare() that\ndoesn't release the VMA lock on failure, and then release it ourselves\nafter hugetlb_vma_unlock_read()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is triggered by a page fault on a hugetlb mapping in the attacker's own address space, requiring local execution of code on the target system. There is no network-reachable path into `hugetlb_fault()`.\nAC:L - The attacker controls every side of the race — the faulting thread, the sibling thread holding `mmap_lock` for write that forces `mmap_read_trylock()` to fail, and the `munmap()` thread that frees the VMA — and can retry the fault indefinitely. Syzbot reproduced the UAF, confirming it is reliably triggerable.\nPR:L - Any unprivileged local user can create the required private hugetlb VMA via `memfd_create(MFD_HUGETLB)` or `mmap(MAP_HUGETLB|MAP_NORESERVE)` with no capability check, and the UAF path in `hugetlb_no_page()` is reached before any hugepage allocation is attempted. No CAP_* or root is needed.\nUI:N - The attacker's own threads perform the mapping, faulting, and unmapping entirely on their own; no victim action or interaction of any kind is required.\nS:U - The corruption is of a `vm_area_struct` in kernel slab memory belonging to the attacker's own mm, handled by the kernel itself. It is a standard in-kernel memory-safety issue with no crossing of a VM, IOMMU, or other security-authority boundary.\nC:H - After the VMA is freed, `hugetlb_vma_unlock_read()` reads `vma->vm_flags` and `vma->vm_private_data` from reclaimed slab memory, so an attacker who grooms the freed `vm_area_struct` can steer subsequent dereferences and leverage the UAF for kernel memory disclosure.\nI:H - The stale `vma->vm_private_data` is used as a `hugetlb_vma_lock`/`resv_map` pointer and `up_read()` performs an atomic decrement plus possible waiter-list manipulation at that attacker-influenced address, giving a controllable kernel write primitive suitable for privilege escalation via heap spraying.\nA:H - Dereferencing a freed `vm_area_struct` and operating an rwsem derived from reclaimed memory readily causes kernel oops, rwsem-state corruption, or panic, and the attacker can trigger it repeatedly at will."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"mm/hugetlb.c"
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],
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"versions": [
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{
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"version": "9acad7ba3e25d11f4c96df1b7312ae89e6faca5c",
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"lessThan": "e897d184a8dd4a4e1f39c8c495598e4d9472776c",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "d59ebc99dee0a2687a26df94b901eb8216dbf876",
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"status": "affected",
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"mm/hugetlb.c"
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],
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"versions": [
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{
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"version": "6.9",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.9",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.10.13",
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"lessThanOrEqual": "6.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11.2",
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"lessThanOrEqual": "6.11.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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"versionEndExcluding": "6.10.13"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e897d184a8dd4a4e1f39c8c495598e4d9472776c"
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},
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{
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"url": "https://git.kernel.org/stable/c/d59ebc99dee0a2687a26df94b901eb8216dbf876"
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},
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{
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"url": "https://git.kernel.org/stable/c/98b74bb4d7e96b4da5ef3126511febe55b76b807"
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}
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],
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"title": "mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-47676",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-21T13:07:59.972172Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-10-21T13:14:17.370Z"
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}
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}
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}
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} |