# btrfs: take commit root semaphore when iterating in mark_block_group_to_copy()

CVE record · `CVE-2026-98245`

- **Identifiers:** `CVE-2026-98245`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 6 Oct 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 6 Oct 2026, 08:45 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: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before 90242b776df83f8b1ea901f80b568b4fc2318c61` (git)
  - affected: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before bffe773f92885603db14047bba0f12089105929e` (git)
  - affected: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before 93a025166495c63ba5b8ac721c7040d5312e8335` (git)
  - affected: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before 8e2007b263ea250251ec3021a0a197da990ee1a8` (git)
  - affected: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before 709f6a5e986535005110c6c69b322f63631cb200` (git)
  - affected: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before c32490c6d3f3a9f2d177d57c7eb8bbc347561d08` (git)
  - affected: `78ce9fc269af6e69c1399ab910ba6bc81c934f67 to before 0594e3423f4ba3137c734371169491f9a98e9af4` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (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: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.54 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.8 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:** 0.0017, the 6th percentile, on 10 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 6 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98245](https://www.cve.org/CVERecord?id=CVE-2026-98245)
- [NVD: CVE-2026-98245](https://nvd.nist.gov/vuln/detail/CVE-2026-98245)

### References from the CNA

- <https://git.kernel.org/stable/c/90242b776df83f8b1ea901f80b568b4fc2318c61>
- <https://git.kernel.org/stable/c/bffe773f92885603db14047bba0f12089105929e>
- <https://git.kernel.org/stable/c/93a025166495c63ba5b8ac721c7040d5312e8335>
- <https://git.kernel.org/stable/c/8e2007b263ea250251ec3021a0a197da990ee1a8>
- <https://git.kernel.org/stable/c/709f6a5e986535005110c6c69b322f63631cb200>
- <https://git.kernel.org/stable/c/c32490c6d3f3a9f2d177d57c7eb8bbc347561d08>
- <https://git.kernel.org/stable/c/0594e3423f4ba3137c734371169491f9a98e9af4>

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-2026-98245>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98245/>. Everything for agents: <https://agentprime.io/llms.txt>.