CVE-2026-64020 (GCVE-0-2026-64020)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-10-15 10:07
VLAI
Title
nvme-pci: fix dma_vecs leak on p2p memory
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix dma_vecs leak on p2p memory We don't unmap P2P memory, so we don't need to track it. The dma_vec allocation was getting leaked on the completion.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b8b7570a7ec872f2a27b775c4f8710ca8a357adf , < b9390aa62fdcabdaac2d09545be05901f6cecaf5 (git)
Affected: b8b7570a7ec872f2a27b775c4f8710ca8a357adf , < 24ea0de233d9ebb5ebd6f6018eaf2084af25e3dd (git)
Affected: b8b7570a7ec872f2a27b775c4f8710ca8a357adf , < 85686c72966c5ee637893f124ddb31a1cace7bee (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

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              "value": "AV:N - On NVMe-oF storage servers with p2pmem-enabled namespaces backed by local PCIe NVMe, a remote client can trigger this via nvmet-tcp read/write commands that flow through submit_bio() into nvme-pci P2P PRP setup and completion.\nAC:L - Once the P2P-capable NVMe/IOMMU configuration is present, a single crafted read or write reliably leaks the dma_vecs allocation; no races or special memory layout are required.\nPR:N - Remote exploitation via nvmet-tcp requires no local privileges on the target when in-band authentication is not configured, matching pre-authentication network service guidance for fabric targets.\nUI:N - Exploitation is achieved entirely through NVMe I/O commands and requires no victim interaction beyond the attacker (or their client) initiating storage operations.\nS:U - The vulnerability causes kernel memory leakage and NVMe I/O denial within the same kernel security boundary; it does not cross VM, container, or IOMMU isolation boundaries.\nC:N - This is a kmalloc/mempool leak with no out-of-bounds read, use-after-free, or information disclosure; freed dma_vecs tracking memory is not exposed to the attacker.\nI:N - No memory corruption, arbitrary write, or code execution primitive is created; impact is limited to resource exhaustion and I/O failure.\nA:H - Each triggering completion permanently exhausts the single-element dmavec mempool, causing persistent BLK_STS_RESOURCE failures that deny subsequent P2P and non-IOVA PRP I/O on the affected NVMe controller until reboot."
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}



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