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Review reviewCritical

CVE-2026-64018

Linux

In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.

CVSS
9.3
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.3

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.

Affected product and versions

Product
Linux
Affected versions
>= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < 5ddc715324badd7f2641bc177db1d027b402adae, >= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < ff1d5af207bcea857d45fe81505f1bc4b29eaef0, >= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < 01f7f893d5e1baae995beeb86cd0f3e6bb2a3b01, >= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < 763a372d344fb12fae566d36ddb46e92454ad58c, >= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < fa627a5eaa83fc0261f44ef3769693b886ca6e27, >= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < 355e9f2b2a7887ca38100127989af3e422ba71d0, >= ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f < b809d0409991b75a6cff846a5ac27c3062953f84, >= 5.13
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
Not available
CVE-2026-64018 — Linux | SECUFOCUS NOW