# bpf: Disable preemption in bpf_get_stackid

CVE record · `CVE-2026-89799`

- **Identifiers:** `CVE-2026-89799`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:30 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: `d5a3b1f691865be576c2bffa708549b8cdccda19 to before 01fc93f670b3e759413a4d574c18ccfc636d2728` (git)
  - affected: `d5a3b1f691865be576c2bffa708549b8cdccda19 to before e79a70c2e97ae36bbdd371f0ce88a525f7b49f01` (git)
  - affected: `d5a3b1f691865be576c2bffa708549b8cdccda19 to before 18c71e4b65ee60b8611fc071bdd7159f10185117` (git)
  - affected: `d5a3b1f691865be576c2bffa708549b8cdccda19 to before ccf481d73bce6e851cec364fe831c86fe66877cf` (git)
  - affected: `d5a3b1f691865be576c2bffa708549b8cdccda19 to before c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf` (git)
  - affected: `d5a3b1f691865be576c2bffa708549b8cdccda19 to before 15f1bd8574662f1b7b26aaa2e23ebf4066f0117d` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.6`
  - unaffected: `before 4.6` (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: `7.2.5 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 from version 4.6 is affected by a bug in the BPF bpf_get_stackid function, which did not disable preemption while using its call-trace buffer. The source gives few details on attacker requirements or impact. Upgrade to Linux kernel 6.1.191, 6.6.160, 6.12.111, or 6.18.51, 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

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89799](https://www.cve.org/CVERecord?id=CVE-2026-89799)
- [NVD: CVE-2026-89799](https://nvd.nist.gov/vuln/detail/CVE-2026-89799)

### References from the CNA

- <https://git.kernel.org/stable/c/01fc93f670b3e759413a4d574c18ccfc636d2728>
- <https://git.kernel.org/stable/c/e79a70c2e97ae36bbdd371f0ce88a525f7b49f01>
- <https://git.kernel.org/stable/c/18c71e4b65ee60b8611fc071bdd7159f10185117>
- <https://git.kernel.org/stable/c/ccf481d73bce6e851cec364fe831c86fe66877cf>
- <https://git.kernel.org/stable/c/c4efdc1d4cb3e9183e41a1b2a5e0901dbbb31cdf>
- <https://git.kernel.org/stable/c/15f1bd8574662f1b7b26aaa2e23ebf4066f0117d>

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-2026-89799>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89799/>. Everything for agents: <https://agentprime.io/llms.txt>.