# CVE-2026-72223: nvdimm/btt: Free arena sub-allocations on discover_arenas() error path

Status: published. Published: 2026-08-15. Updated: 2026-11-06.

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

nvdimm/btt: Free arena sub-allocations on discover_arenas() error path

Memory allocated by btt_freelist_init(), btt_rtt_init(), and
btt_maplocks_init() is not freed on some discover_arenas() error
paths. This leaks memory when arena discovery fails.

Add the missing kfree() calls to release the allocations before
returning an error.

[ as: commit message and log edits ]

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < 2d0364937550a7b3e2592629c2a68753ac020b28 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < eeb95774bc79268e2b78ebf01d8781560b5bd671 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < 7563f69caa9143a491d5f26e563255c734751545 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < 0b0d9404951aacc9717aa61e77af4a6e9e8f8249 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < 873ced7f345e99f7ee16f9ff226515580332ecc4 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < 30d490bb2c4cd220e7dedf862ab6a09eb5dcbad5 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < ba59b96d8d21dc8729fca44a022ca5919c1848c9 (affected, git); ≥ 5212e11fde4d40fa627668b4f2222d20db488f71; < 13fe4cd9ddd0aacb7777812328be525a11ea3fea (affected, git). Source: CNA: Linux
- Linux / Linux: 4.2 (affected); ≥ 0; < 4.2 (unaffected, semver); ≥ 5.10.261; ≤ 5.10.* (unaffected, semver); ≥ 5.15.212; ≤ 5.15.* (unaffected, semver); ≥ 6.1.178; ≤ 6.1.* (unaffected, semver); ≥ 6.6.145; ≤ 6.6.* (unaffected, semver); ≥ 6.12.97; ≤ 6.12.* (unaffected, semver); ≥ 6.18.40; ≤ 6.18.* (unaffected, semver); ≥ 7.1.5; ≤ 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: 0.22% as of 2026-11-06; percentile 12.55%

- 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/2d0364937550a7b3e2592629c2a68753ac020b28 (CNA: Linux)

- https://git.kernel.org/stable/c/eeb95774bc79268e2b78ebf01d8781560b5bd671 (CNA: Linux)

- https://git.kernel.org/stable/c/7563f69caa9143a491d5f26e563255c734751545 (CNA: Linux)

- https://git.kernel.org/stable/c/0b0d9404951aacc9717aa61e77af4a6e9e8f8249 (CNA: Linux)

- https://git.kernel.org/stable/c/873ced7f345e99f7ee16f9ff226515580332ecc4 (CNA: Linux)

- https://git.kernel.org/stable/c/30d490bb2c4cd220e7dedf862ab6a09eb5dcbad5 (CNA: Linux)

- https://git.kernel.org/stable/c/ba59b96d8d21dc8729fca44a022ca5919c1848c9 (CNA: Linux)

- https://git.kernel.org/stable/c/13fe4cd9ddd0aacb7777812328be525a11ea3fea (CNA: Linux)

- https://git.kernel.org/stable/c/0b0d9404951aacc9717aa61e77af4a6e9e8f8249 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/13fe4cd9ddd0aacb7777812328be525a11ea3fea (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/2d0364937550a7b3e2592629c2a68753ac020b28 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/30d490bb2c4cd220e7dedf862ab6a09eb5dcbad5 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7563f69caa9143a491d5f26e563255c734751545 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/873ced7f345e99f7ee16f9ff226515580332ecc4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/ba59b96d8d21dc8729fca44a022ca5919c1848c9 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/eeb95774bc79268e2b78ebf01d8781560b5bd671 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-72223; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72223; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-72223; retrieved 2026-11-06; source updated Not reported

Revision: bc840a57cf44e44e116ee7bfcd20ce71d74ebb8e20d31fc122510c73259c7715

Canonical: https://y2.dev/cve/CVE-2026-72223

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