CVE-2026-93264RDMA/efa: Fix PBL chunk length computation
- —Not scoredno CVSS score yet
- 0.20%Exploitation in 30 daysEPSS · top 90% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 25 days later
· 25 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < 665cd418b8561a099c3854443f8ad8ae751b72a0
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < 932e5684906a090644a9061fae2d254041c3b8f2
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < 489b28f2377afa70c18c45b06a6387f3d39bb123
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < aadf3f9b5edb7f0a77e9172b237d2e07c754829c
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < 3982714e15512b83115897806dacc94899683420
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < da7805f0211af19968584e621074f253ac07dba7
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < 1d4b5902773475fc97151379b7e5f09cad0fa57b
- affected 40909f664d279765af430acc5db348a0b71c9b0a – < 229b42d7450c1cf96f45ec39ebb69211b06bc036
- affected 5.2
- unaffected < 5.2
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/665cd418b8561a099c3854443f8ad8ae751b72a0 (opens in a new tab)
- https://git.kernel.org/stable/c/932e5684906a090644a9061fae2d254041c3b8f2 (opens in a new tab)
- https://git.kernel.org/stable/c/489b28f2377afa70c18c45b06a6387f3d39bb123 (opens in a new tab)
- https://git.kernel.org/stable/c/aadf3f9b5edb7f0a77e9172b237d2e07c754829c (opens in a new tab)
- https://git.kernel.org/stable/c/3982714e15512b83115897806dacc94899683420 (opens in a new tab)
- https://git.kernel.org/stable/c/da7805f0211af19968584e621074f253ac07dba7 (opens in a new tab)
- https://git.kernel.org/stable/c/1d4b5902773475fc97151379b7e5f09cad0fa57b (opens in a new tab)
- https://git.kernel.org/stable/c/229b42d7450c1cf96f45ec39ebb69211b06bc036 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-86136 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-93264)Record last updated .