CVE-2026-64317

Kernel memory disclosure via unchecked symlink length

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in Linux Kernel isofs allows local users to disclose adjacent kernel memory through a crafted ISO 9660 image. The Rock Ridge SL loops trust each component length without confirming that its header and text fit inside the record, then copy out-of-bounds bytes into readlink output. An active ordinary desktop user can mount the image through common UDisks2 policy; the same read can also cause a kernel oops or panic.

CVSS severity7.1
High
EPSS probability0.17%
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 Linux Kernel isofs allows local users to disclose adjacent kernel memory through a crafted ISO 9660 image. The Rock Ridge SL loops trust each component length without confirming that its header and text fit inside the record, then copy out-of-bounds bytes into readlink output. An active ordinary desktop user can mount the image through common UDisks2 policy; the same read can also cause a kernel oops or panic.

The record

CVE
CVE-2026-64317
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1005
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1015e1c4b2fadd9c09704e24738e46598778c869
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <36fe7d25dbc40da0c6b1dd4513a4f69ac6164eee
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fa1d6a5ec2356d2107dead614437c66fa7138b1
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6bf41db09ef935d76fcc84ccf213b42c18de95ee
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9830725078c8483c6831ec10222ae724806ea36b
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a22cb6bb54dc167047ea9e70d97dfbc2c15649e3
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b5699642640d6cff357638738c5293985cd5a53d
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b736b12108fd116c41777628f5a333791604df26
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1015e1c4b2fadd9c09704e24738e46598778c869; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <36fe7d25dbc40da0c6b1dd4513a4f69ac6164eee; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fa1d6a5ec2356d2107dead614437c66fa7138b1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6bf41db09ef935d76fcc84ccf213b42c18de95ee; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9830725078c8483c6831ec10222ae724806ea36b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a22cb6bb54dc167047ea9e70d97dfbc2c15649e3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b5699642640d6cff357638738c5293985cd5a53d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b736b12108fd116c41777628f5a333791604df26; version=2.6.12

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.1Linux kernel CNACVSS:3.1/AV:L/AC:L/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

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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
T1005Data from Local System

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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