CVE-2026-92518

Kernel memory corruption via miscalculated tailcall offset

Published Sep 17, 2026 · Updated Sep 18, 2026

Kernel stack corruption in affected Linux kernels allows local users to crash the system or corrupt kernel memory through BPF tail calls. The RISC-V JIT adds the KCFI instruction offset twice, making a tail call skip the stack-pointer adjustment and execute with the caller's kernel frame exposed. Exploitation requires a CONFIG_CFI_CLANG build and either unprivileged BPF access, CAP_BPF, or a delegated BPF token.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel stack corruption in affected Linux kernels allows local users to crash the system or corrupt kernel memory through BPF tail calls. The RISC-V JIT adds the KCFI instruction offset twice, making a tail call skip the stack-pointer adjustment and execute with the caller's kernel frame exposed. Exploitation requires a CONFIG_CFI_CLANG build and either unprivileged BPF access, CAP_BPF, or a delegated BPF token.

The record

CVE
CVE-2026-92518
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <34b1bb33a025787e05f966e74de18cd36276f801
  2. Affected versionversion=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <52fb1756ea1d2759dfef2d86245be00b05dac3a2
  3. Affected versionversion=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <a6e11a81da3420fd37f1518d4f238c4d5784086e
  4. Affected versionversion=6.11.6 <6.12
  5. Affected versionversion=6.12
  6. Affected versionversion=fe5b68fdcec0f3d97a32f4c4acfef59cf90718f7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <34b1bb33a025787e05f966e74de18cd36276f801; version=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <52fb1756ea1d2759dfef2d86245be00b05dac3a2; version=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <a6e11a81da3420fd37f1518d4f238c4d5784086e; version=6.11.6 <6.12; version=6.12; version=fe5b68fdcec0f3d97a32f4c4acfef59cf90718f7

Published CVSS scores

7.8LinuxCVSS: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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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