LoongArch: BPF: Refactor jump offset calculation in tail call (CVE-2026-89906) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89906

LoongArch: BPF: Refactor jump offset calculation in tail call

Answer in brief

CVE-2026-89906 records a Unknown severity vulnerability in LoongArch: BPF: Refactor jump offset calculation in tail call. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <882b8912b7e92341fdb115ba0e2e5142a28684ff \|\| >=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <96f44d493c280ea161569c43d7ed0f3b0815803a \|\| >=cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 <37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8 \|\| 1a782fa32e644aa9fbae6c8488f3e61221ac96e1 \|\| 17c010fe45def335fe03a0718935416b04c7f349 \|\| f83d469e16bb1f75991ca67c56786fb2aaa42bea \|\| f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f \|\| 9262e3e04621558e875eb5afb5e726b648cd5949 \|\| >=6.1.149 <6.2 \|\| >=6.6.103 <6.7 \|\| >=6.12.43 <6.13 \|\| >=6.15.11 <6.16 \|\| >=6.16.2 <6.17	882b8912b7e92341fdb115ba0e2e5142a28684ff, 96f44d493c280ea161569c43d7ed0f3b0815803a, 37d545d12f21c4d50612ecaebd7ae1e5bf91b2d8, 6.2, 6.7, 6.13, 6.16, 6.17
Linux/Linuxgeneric	6.17	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 882b8912b7e92341fdb115ba0e2e5142a28684ff if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Refactor jump offset calculation in tail call The old macro-based jmp_offset calculation derives the jump distance from a stale prior-pass code stride, which can lead to wrong branch offsets and soft lockups under extra JIT passes. Fix this by calculating the offset directly on the absolute target: "ctx->offset[insn + 1] - ctx->idx". To avoid a false 16-bit range check abort during size estimation, add a "ctx->image == NULL" guard to inject a safe dummy offset.

Quoted source text, attributed separately from HOL analysis.