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

CVE record · `CVE-2026-89719`

- **Identifiers:** `CVE-2026-89719`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before fee53224c8261541cf310b57ac7c77a80e144483` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before 26a55336be91004dbd438f3b89b0c31617459976` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before a189cae92e97d90a9553740f5558d6f74446d3d1` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before f5e9f3a75efc774f17ab3f33826630d7fe30c7ea` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before 6d52c1f43ff39ea1ebf8f016e847677f0b60cf2b` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3` (git)
  - affected: `c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 to before 391f057f44a51cc9418da5cba78b014324174264` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.18`
  - unaffected: `before 4.18` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel zram driver is affected from version 4.18 until fixed in each stable branch. A race between resetting a zram device to a smaller disksize and reading its block state can cause an out-of-bounds memory access. The source gives few details on attacker requirements. Upgrade to 5.10.273, 5.15.224, 6.1.191, 6.6.160, or a later release in those series.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89719](https://www.cve.org/CVERecord?id=CVE-2026-89719)
- [NVD: CVE-2026-89719](https://nvd.nist.gov/vuln/detail/CVE-2026-89719)

### References from the CNA

- <https://git.kernel.org/stable/c/fee53224c8261541cf310b57ac7c77a80e144483>
- <https://git.kernel.org/stable/c/26a55336be91004dbd438f3b89b0c31617459976>
- <https://git.kernel.org/stable/c/a189cae92e97d90a9553740f5558d6f74446d3d1>
- <https://git.kernel.org/stable/c/f5e9f3a75efc774f17ab3f33826630d7fe30c7ea>
- <https://git.kernel.org/stable/c/6d52c1f43ff39ea1ebf8f016e847677f0b60cf2b>
- <https://git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d>
- <https://git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3>
- <https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-89719>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89719/>. Everything for agents: <https://agentprime.io/llms.txt>.