# params: fix charp corruption on allocation failure

CVE record · `CVE-2026-89552`

- **Identifiers:** `CVE-2026-89552`
- **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, 19:44 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: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 72835d539ed3eb4c4b85b85a3f3976c7bdc70b91` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 32c1f305cfad192cd98468140beedeffe4792f53` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 614f873268c5b172804c9af6639bd17b7e1e2359` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 704ecd010d4a9b33160e40b74eb402f6b86a18e0` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 0d8e2404925a0607ffec79a53170715a46936896` (git)
  - affected: `e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.30`
  - unaffected: `before 2.6.30` (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: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 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's handling of string module parameters is affected from 2.6.30 until the fixes listed in the advisory. If a parameter update fails to allocate memory, the old value is freed and the parameter is left NULL, which can later cause a kernel NULL pointer dereference and crash when zswap is set up. Upgrade to a fixed kernel release; the 5.10.273, 5.15.224, 6.1.191 and 6.6.160 stable releases and later are listed as unaffected.

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-2026-89552](https://www.cve.org/CVERecord?id=CVE-2026-89552)
- [NVD: CVE-2026-89552](https://nvd.nist.gov/vuln/detail/CVE-2026-89552)

### References from the CNA

- <https://git.kernel.org/stable/c/72835d539ed3eb4c4b85b85a3f3976c7bdc70b91>
- <https://git.kernel.org/stable/c/c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f>
- <https://git.kernel.org/stable/c/32c1f305cfad192cd98468140beedeffe4792f53>
- <https://git.kernel.org/stable/c/31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1>
- <https://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359>
- <https://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0>
- <https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896>
- <https://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae>

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-2026-89552>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89552/>. Everything for agents: <https://agentprime.io/llms.txt>.