nvme-tcp: fix host memory disclosure on R2T for a read command

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89481
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:29 UTC
Updated2026-09-14 13:19:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix host memory disclosure on R2T for a read command nvme_tcp_handle_r2t() does not check the direction of the request the R2T refers to. A malicious controller can send an R2T for a READ and the host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the H2CData header and nvme_tcp_try_send_data() sends the request's data buffer. That buffer is the READ destination, so its contents go to the controller. The command then completes normally and nothing is logged. Against a test controller that answers every READ with an R2T, a 4096 byte buffered read returned all 4096 bytes, split over two R2Ts. The pages contained stale kernel data, including an array of struct page pointers. Reject an R2T for a request that is not a write.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.003790000 probability, percentile 0.313500000 (date 2026-09-14)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 49a4dcf57608ebf6432dbcb203ed25e7ed581445 git Not specified
CNA Linux Linux affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 bc4013c7cce58d46f792c8c87bc8c8318a70190e git Not specified
CNA Linux Linux affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 a4c3c7310156493797c920b10d8648c07aa05403 git Not specified
CNA Linux Linux affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 3b3d27670c0c890ba7cf1bc3614cab61bde6d25c git Not specified
CNA Linux Linux affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 3a0b05145053a5fad1a2ddb4e4d87b07385e63e5 git Not specified
CNA Linux Linux affected 3f2304f8c6d6ed97849057bd16fee99e434ca796 6efbc52237facda35d2d874fe1765bb4839275d8 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bc4013c7cce58d46f792c8c87bc8c8318a70190e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/49a4dcf57608ebf6432dbcb203ed25e7ed581445 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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