VulnerabilityPublished 24 Sep 2026Updated 19 Oct 2026

CVE-2026-93267: Linux kernel · RDMA/core: Fix potential use after free in uverbs_free_dmah()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bfc119a40c04bbe3daad826f2160ccbfae6c64ce : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:46 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bfc119a40c04bbe3daad826f2160ccbfae6c64ce, 2696626a0be5877f445fb647c25ef43930c777e6, 8b22722f45a29a7c0900b1d4d0bc5da5492ece10

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to bfc119a40c04bbe3daad826f2160ccbfae6c64ce, 2696626a0be5877f445fb647c25ef43930c777e6 or 8b22722f45a29a7c0900b1d4d0bc5da5492ece10.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d83edab562a496a42720902a1d2effccd05c37c5, < bfc119a40c04bbe3daad826f2160ccbfae6c64ce	Fixed in bfc119a40c04bbe3daad826f2160ccbfae6c64ce
LinuxLinux	Affected ≥ d83edab562a496a42720902a1d2effccd05c37c5, < 2696626a0be5877f445fb647c25ef43930c777e6	Fixed in 2696626a0be5877f445fb647c25ef43930c777e6
LinuxLinux	Affected ≥ d83edab562a496a42720902a1d2effccd05c37c5, < 8b22722f45a29a7c0900b1d4d0bc5da5492ece10	Fixed in 8b22722f45a29a7c0900b1d4d0bc5da5492ece10
LinuxLinux	Affected =6.17	Fixed in–

AI-suggested

A fix is available and has been applied in the Linux kernel source code (commits bfc119a40c04bbe3daad826f2160ccbfae6c64ce, 2696626a0be5877f445fb647c25ef43930c777e6, 8b22722f45a29a7c0900b1d4d0bc5da5492ece10). Users and administrators should update to a Linux kernel version that includes these commits to remediate the vulnerability.

Description

A use-after-free vulnerability was identified and fixed in the Linux kernel's RDMA core subsystem, specifically in the uverbs_free_dmah() function. The flaw involved improper synchronization when freeing dmah resources, potentially allowing access to freed memory. The fix moves the restrack removal call to the start of the destruction process, preventing new references to the dmah during its destruction and ensuring consistent lifecycle management.

Impact

This vulnerability could lead to use-after-free conditions in the RDMA core subsystem of the Linux kernel, potentially causing memory corruption or system instability if exploited. However, no known exploits are reported in the wild. The impact is limited to systems running the affected Linux kernel version with RDMA functionality enabled.

Summary

The Linux kernel RDMA core had a use-after-free vulnerability in the uverbs_free_dmah() function. The synchronization mechanism for dmah objects accessed via netlink relied on rdma_restrack_get(), but rdma_restrack_del() was called too late—after vendor-specific resources were freed. This timing allowed a short window where the dmah could still be accessed through restrack, causing a potential use-after-free condition. The patch moves the rdma_restrack_begin_del() call to the start of uverbs_free_dmah(), removing the dmah from restrack before releasing internal resources, thus preventing new references to a dmah being destroyed and maintaining proper resource lifecycle order.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 13:46 UTC

Technical details

References

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