CVE-2026-74363

Local privilege escalation via bpffs inode use-after-free

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux bpffs allows local users to corrupt kernel memory through concurrent unlink and RCU path-walk operations. bpf_destroy_inode frees the inode and cached i_link without an RCU grace period while another task can still read inode fields during path walking. Low-privileged bpffs access and a controlled race are required; successful exploitation can compromise kernel confidentiality, integrity, and availability.

CVSS severity7.8
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

Use-after-free in Linux bpffs allows local users to corrupt kernel memory through concurrent unlink and RCU path-walk operations. bpf_destroy_inode frees the inode and cached i_link without an RCU grace period while another task can still read inode fields during path walking. Low-privileged bpffs access and a controlled race are required; successful exploitation can compromise kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-74363
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4f375ade6aa9f37fd72d7a78682f639772089eed <0497ff765746d9b2d17445c8f7cc737b36c0152a
  2. Affected versionversion=4f375ade6aa9f37fd72d7a78682f639772089eed <61f19729728243c82476dee31315143ed3275e7f
  3. Affected versionversion=4f375ade6aa9f37fd72d7a78682f639772089eed <b93c55b4932dd7e32dca8cf34a3443cc87a02906
  4. Affected versionversion=5.15.195 <5.15.212
  5. Affected versionversion=6.1.157 <6.1.178
  6. Affected versionversion=6.12.54 <6.12.97
  7. Affected versionversion=6.17.4 <6.18
  8. Affected versionversion=6.18
  9. Affected versionversion=6.6.113 <6.6.145
  10. Affected versionversion=743a620c661994c7f0938e6dd32fb0883fb1e0ea <5fecb71c10c28aef276ba49c718dc961745fdcf0
  11. Affected versionversion=b6e9645be9eb93f7aff3ca887f8edb6f1d63358f <c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2
  12. Affected versionversion=de2d2baecc84cc7fca52eec2b9b55d89c93e3565
  13. Affected versionversion=e28616ca3d67e745ecb2f10eba4a626e1fc9a203 <ea1c243c39e32b7fc1c2edfe32081ff7e30a877c
  14. Affected versionversion=ee04cff9ed4d6bb25802f5cecfcd0750500410f3 <53649846e0437d1d9b7cb993cfe54c367addf7ae

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4f375ade6aa9f37fd72d7a78682f639772089eed <0497ff765746d9b2d17445c8f7cc737b36c0152a; version=4f375ade6aa9f37fd72d7a78682f639772089eed <61f19729728243c82476dee31315143ed3275e7f; version=4f375ade6aa9f37fd72d7a78682f639772089eed <b93c55b4932dd7e32dca8cf34a3443cc87a02906; version=5.15.195 <5.15.212; version=6.1.157 <6.1.178; version=6.12.54 <6.12.97; version=6.17.4 <6.18; version=6.18; version=6.6.113 <6.6.145; version=743a620c661994c7f0938e6dd32fb0883fb1e0ea <5fecb71c10c28aef276ba49c718dc961745fdcf0; version=b6e9645be9eb93f7aff3ca887f8edb6f1d63358f <c70d0f9114c3cc156f6029a400c4eb7e6f7c82b2; version=de2d2baecc84cc7fca52eec2b9b55d89c93e3565; version=e28616ca3d67e745ecb2f10eba4a626e1fc9a203 <ea1c243c39e32b7fc1c2edfe32081ff7e30a877c; version=ee04cff9ed4d6bb25802f5cecfcd0750500410f3 <53649846e0437d1d9b7cb993cfe54c367addf7ae

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3Canonical UbuntuCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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