CVE-2026-98799Hinoki check available

Kernel crash via detached-program use-after-free

Published Oct 18, 2026 · Updated Oct 18, 2026

Use-after-free in Linux BPF trampolines allows attackers to trigger a kernel crash through concurrent program detachment. Program detachment releases the last reference while an older trampoline image still contains a callable program address, allowing a task returning from an earlier sleepable program to execute freed memory. Reachability requires concurrent BPF program detachment and hook execution; the disclosed consequence is a kernel fault, not demonstrated privilege escalation.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux BPF trampolines allows attackers to trigger a kernel crash through concurrent program detachment. Program detachment releases the last reference while an older trampoline image still contains a callable program address, allowing a task returning from an earlier sleepable program to execute freed memory. Reachability requires concurrent BPF program detachment and hook execution; the disclosed consequence is a kernel fault, not demonstrated privilege escalation.

The record

CVE
CVE-2026-98799
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=5.10.28 <5.11
  2. Affected versionversion=5.11.11 <5.12
  3. Affected versionversion=5.12
  4. Affected versionversion=85d177f56e5256e14b74a65940f981f6e3e8bb32
  5. Affected versionversion=e21aa341785c679dd409c8cb71f864c00fe6c463 <17637e1a581a22466ac3620a91e099683ff9cc6f
  6. Affected versionversion=e21aa341785c679dd409c8cb71f864c00fe6c463 <967566ad325b42150483e81acb09ea9d800c00b8
  7. Affected versionversion=e21d2b92354b3cd25dd774ebb0f0e52ff04a7861

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.28 <5.11; version=5.11.11 <5.12; version=5.12; version=85d177f56e5256e14b74a65940f981f6e3e8bb32; version=e21aa341785c679dd409c8cb71f864c00fe6c463 <17637e1a581a22466ac3620a91e099683ff9cc6f; version=e21aa341785c679dd409c8cb71f864c00fe6c463 <967566ad325b42150483e81acb09ea9d800c00b8; version=e21d2b92354b3cd25dd774ebb0f0e52ff04a7861

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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