# bpf: Fix mmap_lock leak in irq_work path

CVE record · `CVE-2026-90247`

- **Identifiers:** `CVE-2026-90247`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:07 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: `eac9153f2b584c702cea02c1f1a57d85aa9aea42 to before d6d091873e12d1de36d7228c4f452e6cace3a23e` (git)
  - affected: `eac9153f2b584c702cea02c1f1a57d85aa9aea42 to before b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8` (git)
  - affected: `eac9153f2b584c702cea02c1f1a57d85aa9aea42 to before 931f62311c058d79f29548f20943969bb441ce87` (git)
  - affected: `eac9153f2b584c702cea02c1f1a57d85aa9aea42 to before a052ad5edccf5319f50ed955de4368f8318a9f20` (git)
  - affected: `eac9153f2b584c702cea02c1f1a57d85aa9aea42 to before 051f2da26ce377f683b938a3382e0f16d02f3139` (git)
  - affected: `eac9153f2b584c702cea02c1f1a57d85aa9aea42 to before fa9dcacdcdf487f0ffef64bf67622f1caed509f1` (git)
  - affected: `a7f4da875c16f3b8bef0d9ec67528111045bfcd8` (git)
  - affected: `f1838da73cccb238b8be4ef464fce0168dc7ba84` (git)
  - affected: `4.19.92 to before 4.20` (semver)
  - affected: `5.4.7 to before 5.5` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.5`
  - unaffected: `before 5.5` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 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 BPF stack map and bpf_find_vma() code paths could acquire two mmap read locks while only one deferred unlock ran, leaking a read lock and blocking exit_mmap(). The source does not describe the attacker's requirements in detail. Upgrade the Linux kernel to a fixed version: 6.1.191 or later in the 6.1 series, 6.6.160 or later in 6.6, 6.12.114 or later in 6.12, 6.18.52 or later in 6.18, or a release that includes the fix commit for your branch.

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 11th 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90247](https://www.cve.org/CVERecord?id=CVE-2026-90247)
- [NVD: CVE-2026-90247](https://nvd.nist.gov/vuln/detail/CVE-2026-90247)

### References from the CNA

- <https://git.kernel.org/stable/c/d6d091873e12d1de36d7228c4f452e6cace3a23e>
- <https://git.kernel.org/stable/c/b6c9daf6097f9b39162b8e736a6ac7caf5ef6fc8>
- <https://git.kernel.org/stable/c/931f62311c058d79f29548f20943969bb441ce87>
- <https://git.kernel.org/stable/c/a052ad5edccf5319f50ed955de4368f8318a9f20>
- <https://git.kernel.org/stable/c/051f2da26ce377f683b938a3382e0f16d02f3139>
- <https://git.kernel.org/stable/c/fa9dcacdcdf487f0ffef64bf67622f1caed509f1>

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-2026-90247>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90247/>. Everything for agents: <https://agentprime.io/llms.txt>.