VulnerabilityPublished 25 Sep 2026Updated 19 Oct 2026

CVE-2026-97617: Linux kernel · ring-buffer: Check resize_disabled before publishing the new subbuf order

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f2099644e1b2a2c0805c5240d63ab0522d9d0174 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f2099644e1b2a2c0805c5240d63ab0522d9d0174, d860c67c051685abb0460b593b193f0f45f4fa92, 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 25 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 f2099644e1b2a2c0805c5240d63ab0522d9d0174, d860c67c051685abb0460b593b193f0f45f4fa92, 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76 or 9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < f2099644e1b2a2c0805c5240d63ab0522d9d0174	Fixed in f2099644e1b2a2c0805c5240d63ab0522d9d0174
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < d860c67c051685abb0460b593b193f0f45f4fa92	Fixed in d860c67c051685abb0460b593b193f0f45f4fa92
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76	Fixed in 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06	Fixed in 9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06
LinuxLinux	Affected =6.10	Fixed in–

AI-suggested

A fix is available in the Linux kernel as identified by the commits f2099644e1b2a2c0805c5240d63ab0522d9d0174, d860c67c051685abb0460b593b193f0f45f4fa92, 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76, and 9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06. Users and administrators should update to the patched Linux kernel version 6.10 or later containing these fixes to remediate the issue.

Description

A vulnerability in the Linux kernel's ring-buffer subsystem allows a race condition during resizing of user-mapped buffers. The function ring_buffer_subbuf_order_set() updates the sub-buffer order without properly checking if resizing is disabled on CPUs, leading to potential inconsistencies in memory mapping. This can cause the kernel to insert pages beyond the intended sub-buffer into the virtual memory area (VMA). The issue is fixed by verifying CPU states before updating the sub-buffer order.

Impact

The vulnerability can lead to inconsistent memory mappings in user-space buffers, potentially causing memory corruption or data integrity issues due to pages being mapped beyond their intended sub-buffer boundaries. This could affect applications relying on the ring-buffer for tracing or logging, possibly leading to crashes or incorrect data reads. However, no public exploits or in-the-wild attacks are known.

Summary

CVE-2026-97617 addresses a flaw in the Linux kernel's ring-buffer implementation where ring_buffer_subbuf_order_set() stores a new sub-buffer order before confirming that no CPUs have resizing disabled. Because user-mapped buffers disable resizing and __rb_map_vma() reads the sub-buffer order without locking buffer->mutex, a race condition can occur if an mmap operation races with a failing order change. This results in the mapping being resized with the new order and pages being inserted beyond the sub-buffer boundary into the VMA. The fix involves checking the CPUs' resize_disabled state before storing the new sub-buffer order to prevent this race condition.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 13:36 UTC

Technical details

References

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