params: fix charp corruption on allocation failure (CVE-2026-89552) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89552

params: fix charp corruption on allocation failure

Answer in brief

CVE-2026-89552 records a Unknown severity vulnerability in params: fix charp corruption on allocation failure. 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 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 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	>=e180a6b7759a99a28cbcce3547c4c80822cb6c2a <614f873268c5b172804c9af6639bd17b7e1e2359 \|\| >=e180a6b7759a99a28cbcce3547c4c80822cb6c2a <704ecd010d4a9b33160e40b74eb402f6b86a18e0 \|\| >=e180a6b7759a99a28cbcce3547c4c80822cb6c2a <0d8e2404925a0607ffec79a53170715a46936896 \|\| >=e180a6b7759a99a28cbcce3547c4c80822cb6c2a <3dfaae04243cde460d82dfc2a7dd0bb6664d20ae	614f873268c5b172804c9af6639bd17b7e1e2359, 704ecd010d4a9b33160e40b74eb402f6b86a18e0, 0d8e2404925a0607ffec79a53170715a46936896, 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae
Linux/Linuxgeneric	2.6.30	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 614f873268c5b172804c9af6639bd17b7e1e2359 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: params: fix charp corruption on allocation failure param_set_charp() stores charp parameters in allocated memory after slab is available, and releases the previous value when the parameter is updated. The previous value is released before the replacement allocation succeeds. If kmalloc_parameter() fails, the setter returns -ENOMEM with the parameter left as NULL. Failing zswap's compressor update before zswap is initialized can later trigger: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:strcmp+0x10/0x30 Call Trace: zswap_setup+0x3b1/0x490 zswap_enabled_param_set+0x5b/0xa0 param_attr_store+0x93/0xe0 module_attr_store+0x1c/0x30 kernfs_fop_write_iter+0x116/0x1f0 Allocate and copy the replacement first, then replace the parameter value only after allocation succeeds.

Quoted source text, attributed separately from HOL analysis.