# arm64: mm: Fix the lockless page-table walk in show_pte()

CVE record · `CVE-2026-93239`

- **Identifiers:** `CVE-2026-93239`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 24 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 24 Sept 2026, 15:34 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: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before b8f06b73ad146d84a33c124563c93eeef4f5b674` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before b3535b6cb2c48f97b8c3378eb9ea12538425bf14` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before e1b06278a7e241da0cd3187871e67255f956d184` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before 08d931a0a850ad16a64f2cd23a19f40795cdbdf7` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before 68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before 0f05d95b99164a9ccc4cf4a4920e0ff0228138ad` (git)
  - affected: `1d18c47c735e8adfe531fc41fae31e98f86b68fe to before a77644d009dece1104b6fcc6e322b0e4503db0d6` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.7`
  - unaffected: `before 3.7` (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: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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 on arm64 is affected in the show_pte() routine, which walks page tables without locking and can run with interrupts enabled. A concurrent teardown can free a table page during the walk or clear a parent entry after it was checked, causing a bogus pointer and a repeated fault. The source gives few details on how an attacker would trigger this. Upgrade to a fixed kernel version for your branch; no workaround is listed.

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:** 0.0022, the 12th percentile, on 13 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 24 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-93239](https://www.cve.org/CVERecord?id=CVE-2026-93239)
- [NVD: CVE-2026-93239](https://nvd.nist.gov/vuln/detail/CVE-2026-93239)

### References from the CNA

- <https://git.kernel.org/stable/c/b8f06b73ad146d84a33c124563c93eeef4f5b674>
- <https://git.kernel.org/stable/c/b3535b6cb2c48f97b8c3378eb9ea12538425bf14>
- <https://git.kernel.org/stable/c/e1b06278a7e241da0cd3187871e67255f956d184>
- <https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7>
- <https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1>
- <https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3>
- <https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad>
- <https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6>

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-2026-93239>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-93239/>. Everything for agents: <https://agentprime.io/llms.txt>.