What’s Vulnerable › Vulnerabilities

CVE-2026-89528: svcrdma: Reject Read lists that exceed the page budget

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

In 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.

Affected products

• Linux: 4.13 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/08aa4162df91880a79be744aaa9570b04d4875c4
• https://git.kernel.org/stable/c/0ca487abb3bdf581851664b5db21f364caf57682
• https://git.kernel.org/stable/c/1a3af2262cb384112ef38632de4690682be528b4
• https://git.kernel.org/stable/c/465f511f59a0fa7a80d5d1073c4b24f28ea38f58
• https://git.kernel.org/stable/c/beb4e9801f6362436102acc4cc5304b7324f9365
• https://git.kernel.org/stable/c/e70fdb121171c3eb0ac34eb545721828cd737717

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