Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/efa: Fix PBL chunk length computation On register MR, when creating the PBL, if it's an indirect PBL we create a chunk list to hold the PBL pages pointers. Each chunk is 4KB in size and can hold 510 addresses (EFA_PTRS_PER_CHUNK) and has a 12-byte control buffer at the end of it holding the next chunk's pointer and its length. If the PBL number of pages is a multiple of EFA_PTRS_PER_CHUNK, the calculated last chunk length is wrongly computed as 0, even though that chunk is fully populated with 510 real page pointers. This wrong length is used both to DMA map the chunk and is propagated to the device, causing the device to see the chunk as empty and reject the memory registration. Fix the calculation so it will be performed only if the number of pages isn't a multiple of EFA_PTRS_PER_CHUNK, if it is, its already handled in the above loop correctly. Also prevent out-of-bounds reach in the chunks array in such scenario.
References
- https://git.kernel.org/stable/c/1d4b5902773475fc97151379b7e5f09cad0fa57b
- https://git.kernel.org/stable/c/229b42d7450c1cf96f45ec39ebb69211b06bc036
- https://git.kernel.org/stable/c/3982714e15512b83115897806dacc94899683420
- https://git.kernel.org/stable/c/489b28f2377afa70c18c45b06a6387f3d39bb123
- https://git.kernel.org/stable/c/665cd418b8561a099c3854443f8ad8ae751b72a0
- https://git.kernel.org/stable/c/932e5684906a090644a9061fae2d254041c3b8f2
- https://git.kernel.org/stable/c/aadf3f9b5edb7f0a77e9172b237d2e07c754829c
- https://git.kernel.org/stable/c/da7805f0211af19968584e621074f253ac07dba7
FAQ
What is CVE-2026-93264?
CVE-2026-93264 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: RDMA/efa: Fix PBL chunk length computation On register MR, when creating the PBL, if it's an indirect PBL we create a chunk list t...
How severe is CVE-2026-93264?
CVSS scoring is not yet available for CVE-2026-93264. Check NVD for updates.
Is there a patch for CVE-2026-93264?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.