CVE-2026-89528

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux026d958b38c628a1b4ced534808945365e2747a5 < 1a3af2262cb384112ef38632de4690682be528b4affected
LinuxLinux026d958b38c628a1b4ced534808945365e2747a5 < 465f511f59a0fa7a80d5d1073c4b24f28ea38f58affected
LinuxLinux026d958b38c628a1b4ced534808945365e2747a5 < 0ca487abb3bdf581851664b5db21f364caf57682affected
LinuxLinux4.13affected
LinuxLinux0 < 4.13unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References