CVE-2026-64324

Kernel panic via omitted UDF extent offset

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in the Linux kernel UDF filesystem allows local users to panic the kernel through a crafted filesystem. udf_free_blocks() omits the extent offset from its partition-length check, allowing load_block_bitmap() to index beyond s_block_bitmap[]. Exploitation requires mounting the crafted UDF image and truncating a writable file; unprivileged access depends on desktop UDisks and polkit policy.

CVSS severity7.8
High
EPSS probability0.16%
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 UDF filesystem allows local users to panic the kernel through a crafted filesystem. udf_free_blocks() omits the extent offset from its partition-length check, allowing load_block_bitmap() to index beyond s_block_bitmap[]. Exploitation requires mounting the crafted UDF image and truncating a writable file; unprivileged access depends on desktop UDisks and polkit policy.

The record

CVE
CVE-2026-64324
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-1285, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=05fb2bf477d3fe5421bd4cb699574737f52bd88b
  2. Affected versionversion=097420e48e30f51e8f4f650b5c946f5af63ec1a3
  3. Affected versionversion=22cc7323f090646c8cfb5939e6f15bdc2ed3fd27 <b54aee5652fcd7c23a0904a4623ec462c3edc70c
  4. Affected versionversion=4.19.320 <4.20
  5. Affected versionversion=5.10.224 <5.10.261
  6. Affected versionversion=5.15.165 <5.15.212
  7. Affected versionversion=5.4.282 <5.5
  8. Affected versionversion=56e69e59751d20993f243fb7dd6991c4e522424c <335202ab25b01fdd45889ff25eab70864686dea3
  9. Affected versionversion=56e69e59751d20993f243fb7dd6991c4e522424c <5f0419457f89dce1a3f1c8e62a3adf2f39ab8168
  10. Affected versionversion=56e69e59751d20993f243fb7dd6991c4e522424c <9442d75429b0c556292a7454fe888d54259f5240
  11. Affected versionversion=56e69e59751d20993f243fb7dd6991c4e522424c <be87de7789a82a030a4896bc7683415ec9fa6f2b
  12. Affected versionversion=5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3 <fb49099206c5c57af28a157249fa7bcb5518f99e
  13. Affected versionversion=5def895b42ef16a2da6402818cba8d7ec8ede1ef
  14. Affected versionversion=6.10.5 <6.11
  15. Affected versionversion=6.11
  16. Affected versionversion=6.1.105 <6.1.178
  17. Affected versionversion=6.6.46 <6.6.145
  18. Affected versionversion=7c4fa9ebfce69619d132fe703dc2e2cf62a13723 <12af328d2ee8d68e81ba612246d0b54b22d23e1f
  19. Affected versionversion=934f815345c09c290a9b9a9cfdddc203ec2117e8 <fdd6229d2ae9914c1f25d1041db0f4f312a4fa76

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=05fb2bf477d3fe5421bd4cb699574737f52bd88b; version=097420e48e30f51e8f4f650b5c946f5af63ec1a3; version=22cc7323f090646c8cfb5939e6f15bdc2ed3fd27 <b54aee5652fcd7c23a0904a4623ec462c3edc70c; version=4.19.320 <4.20; version=5.10.224 <5.10.261; version=5.15.165 <5.15.212; version=5.4.282 <5.5; version=56e69e59751d20993f243fb7dd6991c4e522424c <335202ab25b01fdd45889ff25eab70864686dea3; version=56e69e59751d20993f243fb7dd6991c4e522424c <5f0419457f89dce1a3f1c8e62a3adf2f39ab8168; version=56e69e59751d20993f243fb7dd6991c4e522424c <9442d75429b0c556292a7454fe888d54259f5240; version=56e69e59751d20993f243fb7dd6991c4e522424c <be87de7789a82a030a4896bc7683415ec9fa6f2b; version=5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3 <fb49099206c5c57af28a157249fa7bcb5518f99e; version=5def895b42ef16a2da6402818cba8d7ec8ede1ef; version=6.10.5 <6.11; version=6.11; version=6.1.105 <6.1.178; version=6.6.46 <6.6.145; version=7c4fa9ebfce69619d132fe703dc2e2cf62a13723 <12af328d2ee8d68e81ba612246d0b54b22d23e1f; version=934f815345c09c290a9b9a9cfdddc203ec2117e8 <fdd6229d2ae9914c1f25d1041db0f4f312a4fa76

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.org CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-1285Improper Validation of Specified Index, Position, or Offset in Input
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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