138 lines
7.4 KiB
JSON
138 lines
7.4 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-2026-23432",
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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": "2026-01-13T15:37:46.016Z",
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"datePublished": "2026-04-03T15:15:18.061Z",
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"dateUpdated": "2026-08-05T12:21:43.430Z"
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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": "2026-08-05T12:21:43.430Z"
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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\nmshv: Fix use-after-free in mshv_map_user_memory error path\n\nIn the error path of mshv_map_user_memory(), calling vfree() directly on\nthe region leaves the MMU notifier registered. When userspace later unmaps\nthe memory, the notifier fires and accesses the freed region, causing a\nuse-after-free and potential kernel panic.\n\nReplace vfree() with mshv_partition_put() to properly unregister\nthe MMU notifier before freeing the region."
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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 vulnerable path is reached through local `/dev/mshv` and partition-file ioctls, specifically `MSHV_SET_GUEST_MEMORY`, not via network or adjacent protocols.\nAC:L - The attacker controls the memory-region parameters and can subsequently unmap the userspace range to fire the stale MMU notifier. No attacker-uncontrolled race or special victim state is required.\nPR:L - The attacker needs local access to the mshv device or an already-created partition fd, but the vulnerable ioctl itself has no `capable()` check. In a reasonable VMM deployment where that fd/device is granted to a service process, this is Low rather than High.\nUI:N - After obtaining the local mshv interface, the attacker can issue the ioctl and unmap memory without requiring any separate user action.\nS:U - The bug corrupts kernel memory through a kernel driver interface and impacts the same kernel security authority. This is not a guest-to-host escape path from inside a VM.\nC:H - This is a use-after-free of a registered MMU interval notifier embedded in `struct mshv_mem_region`. Reuse of the freed vmalloc object can plausibly expose kernel memory or support read primitives.\nI:H - The stale notifier callback dereferences and writes through fields of freed attacker-reclaimable kernel memory, including notifier sequence and region state. As a kernel UAF, it is plausibly exploitable for memory corruption or control-flow impact.\nA:H - The upstream fix explicitly notes that later userspace unmapping can fire the notifier on freed memory and cause a kernel panic. A local attacker can trigger this repeatedly for host denial of service."
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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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"drivers/hv/mshv_root_main.c"
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],
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"versions": [
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{
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"version": "b9a66cd5ccbb9fade15d0e427e19470d8ad35b75",
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"lessThan": "34861bdc0c0196b6c2dd48f7454029407704ff6e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b9a66cd5ccbb9fade15d0e427e19470d8ad35b75",
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"lessThan": "6922db250422a0dfee34de322f86b7a73d713d33",
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"status": "affected",
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"versionType": "git"
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}
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]
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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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"drivers/hv/mshv_root_main.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "6.19.10",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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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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"versionStartIncluding": "6.19",
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"versionEndExcluding": "6.19.10"
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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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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.0"
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}
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]
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}
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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/34861bdc0c0196b6c2dd48f7454029407704ff6e"
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},
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{
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"url": "https://git.kernel.org/stable/c/6922db250422a0dfee34de322f86b7a73d713d33"
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}
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],
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"title": "mshv: Fix use-after-free in mshv_map_user_memory error path",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |