222 lines
12 KiB
JSON
222 lines
12 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-2026-89995",
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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": "2026-09-11T19:38:34.780Z",
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"datePublished": "2026-09-16T10:33:07.962Z",
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"dateUpdated": "2026-10-30T12:33:44.174Z"
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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": "2026-10-30T12:33:44.174Z"
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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\ndma-direct: return struct page from dma_direct_alloc_from_pool()\n\nCommit 5b138c534fda (\"dma-direct: factor out a dma_direct_alloc_from_pool\nhelper\") changed dma_direct_alloc_from_pool() to return the CPU address\nfrom dma_alloc_from_pool(). That fits dma_direct_alloc(), but\ndma_direct_alloc_pages() also uses the helper and expects a struct page *.\n\nFix this by making dma_direct_alloc_from_pool() return the struct page *\nagain, and pass the CPU address back through an out-parameter for the\ndma_direct_alloc() caller."
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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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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:A - dma_direct_alloc_pages() takes the buggy pool path from dma_alloc_noncoherent(GFP_ATOMIC) in ath11k_peer_rx_tid_setup(), which runs when a same-LAN WiFi peer associates or starts a Block Ack. On SEV/TDX/CCA guests and SME hosts, force_dma_unencrypted() is true, so a wireless attacker reaches the type confusion without a wired/Internet service.\nAC:L - The peer fully controls association and ADDBA, so the GFP_ATOMIC dma_alloc_pages() call is deterministic with no race to win. Confidential-computing dma-direct (atomic decrypted pool, no IOMMU) is the scored deployment, not an uninfluenced memory layout or rare extra config.\nPR:N - ath11k peer/TID setup and the cdns3 gadget GFP_ATOMIC dma_alloc_noncoherent() path run in kernel interrupt/softirq context with no host account, capability, or user-namespace check. An unauthenticated WiFi peer (or USB gadget host) is sufficient.\nUI:N - Peer creation and Block Ack setup are 802.11 protocol operations. Once the interface is up as an AP/hotspot or an already-associated STA, exploitation needs no victim mount, open, or other interactive step.\nS:U - The allocator returns a CPU virtual address as a struct page *, corrupting page and DMA bookkeeping in the same kernel. This is not a VM escape, IOMMU bypass, or host/guest confidential-computing boundary crossing.\nC:H - Callers treat the kernel VA as a struct page, so page_to_virt/page_address/page_to_pfn compute wrong addresses and dma_mmap_pages() can remap a bogus PFN into userspace. That type confusion is an arbitrary kernel-memory disclosure primitive.\nI:H - sg_set_page, page_address stores, dma_set_encrypted(), and dma_free_contiguous() then operate on the fake page pointer, writing, re-encrypting, or freeing the wrong memory. That is an arbitrary kernel write/free primitive usable for control-flow hijack.\nA:H - Interpreting a DMA pool virtual address as a struct page * causes invalid vmemmap/page-flag accesses and buddy frees, which oops or panic the kernel even when not fully turned into a stable read/write primitive."
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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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"kernel/dma/direct.c"
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],
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"versions": [
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{
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"version": "5b138c534fda57c2ebc1e6de72578aa1d70788a6",
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"lessThan": "1ca96bbfef42bbfb139cc6eb1d940c8ca9046f95",
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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": "5b138c534fda57c2ebc1e6de72578aa1d70788a6",
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"lessThan": "7801e616fbe3661f9471b2e9bfcb1ed35460bf16",
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"status": "affected",
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"lessThan": "c3fdb94da43ff23287f85664174c45c45e881a3f",
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"status": "affected",
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"versionType": "git"
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{
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"version": "5b138c534fda57c2ebc1e6de72578aa1d70788a6",
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"lessThan": "408ff2d5bf555bd3f4c84a2edb95c0690bf9edc8",
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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": "5b138c534fda57c2ebc1e6de72578aa1d70788a6",
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"lessThan": "feeb2ef775081a6c188cdd10e7a45369a07ce531",
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"status": "affected",
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"lessThan": "94a04ad732c9f8b9554270fc4038a06737de5c22",
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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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"kernel/dma/direct.c"
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],
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"versions": [
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{
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"version": "5.10",
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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": "5.10",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.110",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.51",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.5",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "6.1.191"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/1ca96bbfef42bbfb139cc6eb1d940c8ca9046f95"
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},
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{
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"url": "https://git.kernel.org/stable/c/7801e616fbe3661f9471b2e9bfcb1ed35460bf16"
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{
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"url": "https://git.kernel.org/stable/c/c3fdb94da43ff23287f85664174c45c45e881a3f"
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"url": "https://git.kernel.org/stable/c/408ff2d5bf555bd3f4c84a2edb95c0690bf9edc8"
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{
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"url": "https://git.kernel.org/stable/c/feeb2ef775081a6c188cdd10e7a45369a07ce531"
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},
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{
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"url": "https://git.kernel.org/stable/c/94a04ad732c9f8b9554270fc4038a06737de5c22"
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}
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],
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"title": "dma-direct: return struct page from dma_direct_alloc_from_pool()",
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