svcrdma: Reject Read lists that exceed the page budget

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Summary

CVECVE-2026-89528
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: Reject Read lists that exceed the page budget Individual Read segment lengths are validated at decode time, but nothing prevents a requester from sending multiple segments whose cumulative length exceeds the rq_pages array budget. When one segment fills the page array exactly, the runtime guard in svc_rdma_build_read_segment() is bypassed because len reaches zero. A subsequent segment then accesses the NULL sentinel slot at rq_pages[rq_maxpages], resulting in a NULL pointer dereference during DMA mapping. Accumulate pages across all Read segments and reject the message at decode time when the total would overflow the page budget.

Risk And Classification

EPSS: 0.002100000 probability, percentile 0.113050000 (date 2026-09-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 026d958b38c628a1b4ced534808945365e2747a5 1a3af2262cb384112ef38632de4690682be528b4 git Not specified
CNA Linux Linux affected 026d958b38c628a1b4ced534808945365e2747a5 465f511f59a0fa7a80d5d1073c4b24f28ea38f58 git Not specified
CNA Linux Linux affected 026d958b38c628a1b4ced534808945365e2747a5 0ca487abb3bdf581851664b5db21f364caf57682 git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 6.18.51 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/0ca487abb3bdf581851664b5db21f364caf57682 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a3af2262cb384112ef38632de4690682be528b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/465f511f59a0fa7a80d5d1073c4b24f28ea38f58 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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