svcrdma: Validate Read chunk positions before reconstruction

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89526
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:35 UTC
Updated2026-09-11 20:19:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: svcrdma: Validate Read chunk positions before reconstruction The RPC/RDMA Read chunk position field is supplied by the remote client and stored verbatim in the parsed chunk list. xdr_count_read_segments() checks only 4-byte alignment; it never compares the position against the received inline body length. In the single-chunk path, svc_rdma_read_complete_one() splits the head and tail kvecs at ch_position. A position past the inline body underflows the tail length, exposing adjacent slab memory to the upper XDR decoder. In the multi-chunk path, svc_rdma_read_multiple_chunks() computes gap lengths between chunks as unsigned subtractions from ch_position. Overlapping Read chunks cause these subtractions to underflow. A final position past the inline body likewise underflows the trailing gap length. svc_rdma_copy_inline_range() then copies past the receive buffer into request pages that are returned to the client through the Reply channel. Bound inline-range copies in svc_rdma_copy_inline_range() against the decoded inline RPC body saved in rc_saved_arg. Reject a single Read chunk positioned beyond that body, and reject multi-chunk lists where accumulated read bytes exceed the next chunk's position. Apply the same position and overlap checks in the call-chunk interleaving path.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 5ab3f6d882fe07ae5e61d0bcfeea00b9409155c2 git Not specified
CNA Linux Linux affected d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 f84ec84d8d4bc65f9ae23372570349687f66fa39 git Not specified
CNA Linux Linux affected d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 577097455d084610fc31e91e6a61c5793b6f04ba git Not specified
CNA Linux Linux affected d96962e6d0e281bab6a48e83b42f5dce6eb28bf4 3779b7b9e7d1c8ba4738f9d327de3b0288cefe9b git Not specified
CNA Linux Linux affected 5.11 Not specified
CNA Linux Linux unaffected 5.11 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/f84ec84d8d4bc65f9ae23372570349687f66fa39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ab3f6d882fe07ae5e61d0bcfeea00b9409155c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3779b7b9e7d1c8ba4738f9d327de3b0288cefe9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/577097455d084610fc31e91e6a61c5793b6f04ba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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