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CVE-2026-93264· NVD / CVE Program· CNA Linux

RDMA/efa: Fix PBL chunk length computation

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.

—No exploit Fix available

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Published
Sep 24, 2026
Updated
Sep 24, 2026
EPSS
0.2% · 8th percentile
CWE
—
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Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Affected systems

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.2affected
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before 665cd418b8561a099c3854443f8ad8ae751b72a0affected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before 932e5684906a090644a9061fae2d254041c3b8f2affected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before 489b28f2377afa70c18c45b06a6387f3d39bb123affected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before aadf3f9b5edb7f0a77e9172b237d2e07c754829caffected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before 3982714e15512b83115897806dacc94899683420affected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before da7805f0211af19968584e621074f253ac07dba7affected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before 1d4b5902773475fc97151379b7e5f09cad0fa57baffected · git
    • 40909f664d279765af430acc5db348a0b71c9b0a and later · before 229b42d7450c1cf96f45ec39ebb69211b06bc036affected · git
    • before 5.2not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxall versions—
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan
  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
    40Plan
  • CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
    40Plan
  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1d4b5902773475fc97151379b7e5f09cad0fa57bVendor (CNA)
Linux Linux229b42d7450c1cf96f45ec39ebb69211b06bc036Vendor (CNA)
Linux Linux3982714e15512b83115897806dacc94899683420Vendor (CNA)
Linux Linux489b28f2377afa70c18c45b06a6387f3d39bb123Vendor (CNA)
Linux Linux665cd418b8561a099c3854443f8ad8ae751b72a0Vendor (CNA)
Linux Linux932e5684906a090644a9061fae2d254041c3b8f2Vendor (CNA)
Linux Linuxaadf3f9b5edb7f0a77e9172b237d2e07c754829cVendor (CNA)
Linux Linuxda7805f0211af19968584e621074f253ac07dba7Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records