CVE-2026-64496

Kernel memory disclosure via event FIFO reset race

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in the Linux Kernel IIO event subsystem allows local users to disclose adjacent kernel memory through an event-FD race. iio_event_getfd() installs an anonymous descriptor before resetting the FIFO, allowing a concurrent read() to race kfifo_reset_out() and move the out index past the in index. Local users with access to /dev/iio:deviceX can trigger an oversized read that exposes kernel heap data or causes an oops or panic.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux Kernel IIO event subsystem allows local users to disclose adjacent kernel memory through an event-FD race. iio_event_getfd() installs an anonymous descriptor before resetting the FIFO, allowing a concurrent read() to race kfifo_reset_out() and move the out index past the in index. Local users with access to /dev/iio:deviceX can trigger an oversized read that exposes kernel heap data or causes an oops or panic.

The record

CVE
CVE-2026-64496
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.15
  2. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <0d4a646d7f87ea3625fafe387043fddc6a2f5e7f
  3. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <72c6aa8e0d74eab91b8694cde97dec088c248fee
  4. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <9dc84ba4be5bbeb29ee49efe6cea2cb32c461424
  5. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <9edefd4c56bee3fe331e0355d1f10a533134999d
  6. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <a13ef1adbc62085b21b546b07b0be7e2fbf52150
  7. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <af791d295737ea6b6ff2c8d8488462a49c14af01
  8. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <d16a702ca7d29c0b7a9b509339d1b044a1cadb32
  9. Affected versionversion=b91accafbb1031b80d22ad83576877ff2f8b4774 <f187dc5a4c4846ffa07d9bda6e760837ed005574

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.15; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <0d4a646d7f87ea3625fafe387043fddc6a2f5e7f; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <72c6aa8e0d74eab91b8694cde97dec088c248fee; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <9dc84ba4be5bbeb29ee49efe6cea2cb32c461424; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <9edefd4c56bee3fe331e0355d1f10a533134999d; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <a13ef1adbc62085b21b546b07b0be7e2fbf52150; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <af791d295737ea6b6ff2c8d8488462a49c14af01; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <d16a702ca7d29c0b7a9b509339d1b044a1cadb32; version=b91accafbb1031b80d22ad83576877ff2f8b4774 <f187dc5a4c4846ffa07d9bda6e760837ed005574

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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