zram: fix out-of-bounds access in read_block_state() (CVE-2026-89719) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89719

zram: fix out-of-bounds access in read_block_state()

Answer in brief

CVE-2026-89719 records a Unknown severity vulnerability in zram: fix out-of-bounds access in read_block_state(). 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	>=c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 <e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d \|\| >=c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 <5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3 \|\| >=c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 <391f057f44a51cc9418da5cba78b014324174264	e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d, 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3, 391f057f44a51cc9418da5cba78b014324174264
Linux/Linuxgeneric	4.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d 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: zram: fix out-of-bounds access in read_block_state() read_block_state() calculates nr_pages before taking dev_lock. If the device is reset and reinitialized with a smaller disksize before lock acquisition, nr_pages still describes the old table. The subsequent loop can then call slot_lock() past the end of the newly allocated table. Read disksize after acquiring dev_lock and checking that the device is initialized. The read lock then keeps the table and its bound stable for the duration of the scan.

Quoted source text, attributed separately from HOL analysis.