CVE-2026-89995 (GCVE-0-2026-89995)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-10-30 12:33
VLAI
Title
dma-direct: return struct page from dma_direct_alloc_from_pool()
Summary
In the Linux kernel, the following vulnerability has been resolved: dma-direct: return struct page from dma_direct_alloc_from_pool() Commit 5b138c534fda ("dma-direct: factor out a dma_direct_alloc_from_pool helper") changed dma_direct_alloc_from_pool() to return the CPU address from dma_alloc_from_pool(). That fits dma_direct_alloc(), but dma_direct_alloc_pages() also uses the helper and expects a struct page *. Fix this by making dma_direct_alloc_from_pool() return the struct page * again, and pass the CPU address back through an out-parameter for the dma_direct_alloc() caller.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6971 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5b138c534fda57c2ebc1e6de72578aa1d70788a6 , < 1ca96bbfef42bbfb139cc6eb1d940c8ca9046f95 (git)
Affected: 5b138c534fda57c2ebc1e6de72578aa1d70788a6 , < 7801e616fbe3661f9471b2e9bfcb1ed35460bf16 (git)
Affected: 5b138c534fda57c2ebc1e6de72578aa1d70788a6 , < c3fdb94da43ff23287f85664174c45c45e881a3f (git)
Affected: 5b138c534fda57c2ebc1e6de72578aa1d70788a6 , < 408ff2d5bf555bd3f4c84a2edb95c0690bf9edc8 (git)
Affected: 5b138c534fda57c2ebc1e6de72578aa1d70788a6 , < feeb2ef775081a6c188cdd10e7a45369a07ce531 (git)
Affected: 5b138c534fda57c2ebc1e6de72578aa1d70788a6 , < 94a04ad732c9f8b9554270fc4038a06737de5c22 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-09-16T10:33:07.962Z",
    "dateReserved": "2026-09-11T19:38:34.780Z",
    "dateUpdated": "2026-10-30T12:33:44.174Z",
    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
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      "title": "dma-direct: return struct page from dma_direct_alloc_from_pool()",
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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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        "lastModified": "2026-10-30T13:20:38.167",
        "metrics": {
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                "confidentialityImpact": "HIGH",
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                "privilegesRequired": "NONE",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-10-30T15:11:38+00:00",
      "cve": "CVE-2026-89995",
      "id": "CVE-2026-89995",
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      "product_status:known_affected": "237",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dma-direct: return struct page from dma_direct_alloc_from_pool()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89995.json",
      "version": "3"
    },
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      "current_release_date": "2026-10-20T00:52:02Z",
      "cve": "CVE-2026-89995",
      "id": "CVE-2026-89995",
      "initial_release_date": "2026-09-17T16:32:19Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "143",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89995",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89995.json",
      "version": "5"
    }
  }
}



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