riscv, bpf: Fix kernel stack corruption in tailcall with CFI (CVE-2026-92518) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-92518

riscv, bpf: Fix kernel stack corruption in tailcall with CFI

Answer in brief

CVE-2026-92518 records a Unknown severity vulnerability in riscv, bpf: Fix kernel stack corruption in tailcall with CFI. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <34b1bb33a025787e05f966e74de18cd36276f801 \|\| >=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <a6e11a81da3420fd37f1518d4f238c4d5784086e \|\| >=30a59cc79754fd9ff3f41b7ee2eb21da85988548 <52fb1756ea1d2759dfef2d86245be00b05dac3a2 \|\| fe5b68fdcec0f3d97a32f4c4acfef59cf90718f7 \|\| >=6.11.6 <6.12	34b1bb33a025787e05f966e74de18cd36276f801, a6e11a81da3420fd37f1518d4f238c4d5784086e, 52fb1756ea1d2759dfef2d86245be00b05dac3a2, 6.12
Linux/Linuxgeneric	6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 34b1bb33a025787e05f966e74de18cd36276f801 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Fix kernel stack corruption in tailcall with CFI When CONFIG_CFI_CLANG is enabled, prog->bpf_func already skips the kcfi instruction during setup. Including it again in the tailcall jump offset causes it to jump over an extra 4 bytes, skipping the stack pointer adjustment, which will result in kernel stack corruption.

Quoted source text, attributed separately from HOL analysis.