CVE-2026-89528
Published: September 15, 2026Last modified: November 3, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.191-r0) |
| 25 LTS | linux-lts | Fixed (6.12.115-r0) | |
| Stream | linux-lts | Fixed (6.18.53-r0) |
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