net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64034
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:43 UTC
Updated2026-07-20 15:17:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_handle_resp() re-reads the same field from the same DMA buffer for test_bit() and pointer arithmetic. DMA-coherent memory is mapped uncacheable on x86 and is shared, unencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes directly to host-visible memory. A H/W can modify the value between the check and the use, bypassing the bounds validation. Fix this by reading hwc_msg_id exactly once using READ_ONCE() into a stack-local variable in mana_hwc_rx_event_handler(), and passing the validated value as a parameter to mana_hwc_handle_resp().

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.001810000 probability, percentile 0.078870000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.3CRITICALCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f a201c66edf2ebc6cfdc3813a889ba20fecebfae3 git Not specified
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f 70ad2dff8d052a85dfef15715b531f38a29108cf git Not specified
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f 566f42fb67a7ebfed6650e407e5b72e6b3e83bf7 git Not specified
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f 6180a06bbc99fd9114b8db4be6c4d46e40f046ef git Not specified
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f 09ec063d87c2dd3fa6f3561361a017bd882e9f37 git Not specified
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f 3c4db56ccd13dd020fbf43afabaee74a40ec75e4 git Not specified
CNA Linux Linux affected ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f 35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a201c66edf2ebc6cfdc3813a889ba20fecebfae3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/566f42fb67a7ebfed6650e407e5b72e6b3e83bf7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6180a06bbc99fd9114b8db4be6c4d46e40f046ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09ec063d87c2dd3fa6f3561361a017bd882e9f37 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35f0f0a2536a4d604b4dbad92c85c4a8fdebb870 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c4db56ccd13dd020fbf43afabaee74a40ec75e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70ad2dff8d052a85dfef15715b531f38a29108cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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