# tracing: Free histogram the field rejected for a bad modifier

CVE record · `CVE-2026-97921`

- **Identifiers:** `CVE-2026-97921`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:22 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: `7403630eb94c1d664fb873f967427ef2f6ee3699 to before a2652fcf96b63e9da04951e4e58e6a0672df695d` (git)
  - affected: `e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c to before 3d42fed18b2c5707b6332ebe87b789fd768eb01b` (git)
  - affected: `e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c to before e787361bb6b0026ea3eb4d3fa7a304c7fcb99555` (git)
  - affected: `e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c to before b22dc0add7d72b8bd9cae3188db0dd65da1c8652` (git)
  - affected: `e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c to before 891c21f6d5673b2a519b536243bfc6dd2d35beb6` (git)
  - affected: `e30fbc618e97b38dbb49f1d44dcd0778d3f23b8c to before 230234d12ce42ab04132a32c3a848f07a5d27a71` (git)
  - affected: `8d505d06d7330f5d67d3e5e9e1c647fb0b10ddad` (git)
  - affected: `6.1.33 to before 6.1.189` (semver)
  - affected: `6.3.7 to before 6.4` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.4`
  - unaffected: `before 6.4` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.7 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## 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:** 0.0021, the 11th percentile, on 12 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 25 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-97921](https://www.cve.org/CVERecord?id=CVE-2026-97921)
- [NVD: CVE-2026-97921](https://nvd.nist.gov/vuln/detail/CVE-2026-97921)

### References from the CNA

- <https://git.kernel.org/stable/c/a2652fcf96b63e9da04951e4e58e6a0672df695d>
- <https://git.kernel.org/stable/c/3d42fed18b2c5707b6332ebe87b789fd768eb01b>
- <https://git.kernel.org/stable/c/e787361bb6b0026ea3eb4d3fa7a304c7fcb99555>
- <https://git.kernel.org/stable/c/b22dc0add7d72b8bd9cae3188db0dd65da1c8652>
- <https://git.kernel.org/stable/c/891c21f6d5673b2a519b536243bfc6dd2d35beb6>
- <https://git.kernel.org/stable/c/230234d12ce42ab04132a32c3a848f07a5d27a71>

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-2026-97921>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-97921/>. Everything for agents: <https://agentprime.io/llms.txt>.