# CVE-2026-68422: btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()

Status: published. Published: 2026-08-10. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix root leak if its reloc root is unexpected in merge_reloc_roots()

If we have an unexpected reloc_root for our root, we jump to the out label
but never drop the reference we obtained for root, resulting in a leak.
Add a missing btrfs_put_root() call.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < f89df93e8aefa4c1c813f835559f2ac727f79766 (affected, git); ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < 3f586b4c92e4272fcd01bf0db0590b63acf3e85b (affected, git); ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < b3d39b03799600c76c33486e2d29b73a771023db (affected, git); ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < 72f673d1c1deb819554d3e7e154f6d84301eb735 (affected, git); ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < 60a23d4ea169e27403f3bb023bb98036797c0206 (affected, git); ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < 7591d1727067d6063247901ad25c4bdc4e5695c4 (affected, git); ≥ 24213fa46c7080c31d79aa2e3e2f0d9480cab700; < ce6050bafb4e33377dc17fcc357736bfc351180c (affected, git). Source: CNA: Linux
- Linux / Linux: 5.13 (affected); ≥ 0; < 5.13 (unaffected, semver); ≥ 5.15.216; ≤ 5.15.* (unaffected, semver); ≥ 6.1.183; ≤ 6.1.* (unaffected, semver); ≥ 6.6.148; ≤ 6.6.* (unaffected, semver); ≥ 6.12.101; ≤ 6.12.* (unaffected, semver); ≥ 6.18.42; ≤ 6.18.* (unaffected, semver); ≥ 7.1.6; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-06; percentile 11.96%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/f89df93e8aefa4c1c813f835559f2ac727f79766 (CNA: Linux)

- https://git.kernel.org/stable/c/3f586b4c92e4272fcd01bf0db0590b63acf3e85b (CNA: Linux)

- https://git.kernel.org/stable/c/b3d39b03799600c76c33486e2d29b73a771023db (CNA: Linux)

- https://git.kernel.org/stable/c/72f673d1c1deb819554d3e7e154f6d84301eb735 (CNA: Linux)

- https://git.kernel.org/stable/c/60a23d4ea169e27403f3bb023bb98036797c0206 (CNA: Linux)

- https://git.kernel.org/stable/c/7591d1727067d6063247901ad25c4bdc4e5695c4 (CNA: Linux)

- https://git.kernel.org/stable/c/ce6050bafb4e33377dc17fcc357736bfc351180c (CNA: Linux)

- https://git.kernel.org/stable/c/3f586b4c92e4272fcd01bf0db0590b63acf3e85b (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/60a23d4ea169e27403f3bb023bb98036797c0206 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/72f673d1c1deb819554d3e7e154f6d84301eb735 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7591d1727067d6063247901ad25c4bdc4e5695c4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/b3d39b03799600c76c33486e2d29b73a771023db (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/ce6050bafb4e33377dc17fcc357736bfc351180c (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f89df93e8aefa4c1c813f835559f2ac727f79766 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68422; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68422; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68422; retrieved 2026-11-06; source updated Not reported

Revision: f875ba2ea47d576fbcf67ee3746bf48c82f5781e3b034e29cf9dd2c5e4e20a05

Canonical: https://y2.dev/cve/CVE-2026-68422

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