346 lines
18 KiB
JSON
346 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-35791",
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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": "2024-05-17T12:19:12.339Z",
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"datePublished": "2024-05-17T12:24:49.520Z",
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"dateUpdated": "2026-08-05T11:29:57.222Z"
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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": "2026-08-05T11:29:57.222Z"
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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\nKVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()\n\nDo the cache flush of converted pages in svm_register_enc_region() before\ndropping kvm->lock to fix use-after-free issues where region and/or its\narray of pages could be freed by a different task, e.g. if userspace has\n__unregister_enc_region_locked() already queued up for the region.\n\nNote, the \"obvious\" alternative of using local variables doesn't fully\nresolve the bug, as region->pages is also dynamically allocated. I.e. the\nregion structure itself would be fine, but region->pages could be freed.\n\nFlushing multiple pages under kvm->lock is unfortunate, but the entire\nflow is a rare slow path, and the manual flush is only needed on CPUs that\nlack coherency for encrypted memory."
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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 code is reached only through the `KVM_MEMORY_ENCRYPT_REG_REGION`/`KVM_MEMORY_ENCRYPT_UNREG_REGION` ioctls on a local KVM VM file descriptor obtained from /dev/kvm. There is no remote or network-facing path to `sev_mem_enc_register_region()`.\nAC:L - The attacker controls both sides of the race, issuing the register and unregister ioctls from two threads it owns, and can widen the window arbitrarily by registering a large region since `sev_clflush_pages()` loops per page with `cond_resched()` after the lock is dropped. Nothing about winning the race depends on conditions outside the attacker's influence.\nPR:L - No capability check exists on the path — neither `kvm_arch_vm_ioctl()`'s `KVM_MEMORY_ENCRYPT_*_REGION` cases nor `sev_guest_init()` require CAP_SYS_ADMIN — so any local user with access to /dev/kvm (commonly granted via the `kvm` group or permissive device modes on virtualization hosts) can create an SEV VM and trigger the UAF.\nUI:N - The attacking process performs both ioctls itself; no action by any other user or victim process is needed.\nS:U - The attacker is host userspace (the VMM process) corrupting host kernel memory, so the vulnerable component and impacted component share the same security authority. This is not a guest-to-host escape, as the guest cannot issue these ioctls.\nC:H - The use-after-free reads a freed, sprayable kvmalloc'd `struct page *` array and then maps and flushes those attacker-influenceable pointers via `kmap_local_page()`, exposing arbitrary kernel/physical memory and enabling information disclosure once the freed slabs are reallocated.\nI:H - Two heap objects (`region` and `region->pages`) are used after being freed and can be reallocated with attacker-controlled contents, giving the heap-spray primitives typical of exploitable UAFs; `clflush_cache_range()` on a bogus mapping additionally acts on memory outside the intended range.\nA:H - Dereferencing freed `region->npages`/`region->pages` and calling `kmap_local_page()` on garbage `struct page` pointers reliably produces an oops or panic, taking the host kernel down."
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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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"arch/x86/kvm/svm/sev.c"
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],
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