CVE-2026-89906

Kernel soft lockup via stale BPF jump offset

Published Sep 16, 2026 · Updated Sep 16, 2026

Incorrect branch offsets in the LoongArch BPF JIT in Linux allow local users to cause kernel soft lockups through crafted tail-call programs. The emit_bpf_tail_call function derives branch distances from a stale prior-pass code stride, so extra JIT passes can target misaligned instruction boundaries. Reachability requires a LoongArch system, BPF JIT compilation, and a tail-call program; BPF loading privileges depend on the unprivileged-BPF setting.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Incorrect branch offsets in the LoongArch BPF JIT in Linux allow local users to cause kernel soft lockups through crafted tail-call programs. The emit_bpf_tail_call function derives branch distances from a stale prior-pass code stride, so extra JIT passes can target misaligned instruction boundaries. Reachability requires a LoongArch system, BPF JIT compilation, and a tail-call program; BPF loading privileges depend on the unprivileged-BPF setting.

The record

CVE
CVE-2026-89906
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=17c010fe45def335fe03a0718935416b04c7f349
  2. Affected versionversion=1a782fa32e644aa9fbae6c8488f3e61221ac96e1
  3. Affected versionversion=6.1.149 <6.2
  4. Affected versionversion=6.12.43 <6.13
  5. Affected versionversion=6.15.11 <6.16
  6. Affected versionversion=6.16.2 <6.17
  7. Affected versionversion=6.17
  8. Affected versionversion=6.6.103 <6.7
  9. Affected versionversion=9262e3e04621558e875eb5afb5e726b648cd5949
  10. Affected versionversion=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8
  11. Affected versionversion=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <882b8912b7e92341fdb115ba0e2e5142a28684ff
  12. Affected versionversion=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <96f44d493c280ea161569c43d7ed0f3b0815803a
  13. Affected versionversion=f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f
  14. Affected versionversion=f83d469e16bb1f75991ca67c56786fb2aaa42bea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=17c010fe45def335fe03a0718935416b04c7f349; version=1a782fa32e644aa9fbae6c8488f3e61221ac96e1; version=6.1.149 <6.2; version=6.12.43 <6.13; version=6.15.11 <6.16; version=6.16.2 <6.17; version=6.17; version=6.6.103 <6.7; version=9262e3e04621558e875eb5afb5e726b648cd5949; version=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8; version=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <882b8912b7e92341fdb115ba0e2e5142a28684ff; version=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <96f44d493c280ea161569c43d7ed0f3b0815803a; version=f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f; version=f83d469e16bb1f75991ca67c56786fb2aaa42bea

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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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