# CVE-2025-38190: atm: Revert atm_account_tx() if copy_from_iter_full() fails.

Status: published. Published: 2025-07-04. Updated: 2026-11-05.

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

atm: Revert atm_account_tx() if copy_from_iter_full() fails.

In vcc_sendmsg(), we account skb->truesize to sk->sk_wmem_alloc by
atm_account_tx().

It is expected to be reverted by atm_pop_raw() later called by
vcc->dev->ops->send(vcc, skb).

However, vcc_sendmsg() misses the same revert when copy_from_iter_full()
fails, and then we will leak a socket.

Let's factorise the revert part as atm_return_tx() and call it in
the failure path.

Note that the corresponding sk_wmem_alloc operation can be found in
alloc_tx() as of the blamed commit.

  $ git blame -L:alloc_tx net/atm/common.c c55fa3cccbc2c~

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 5e0d00992118e234ebf29d5145c1cc920342777e (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < c12430edd92fd49a4800b0f3fb395b50cb16bcc1 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 287b4f085d2ca3375cf1ee672af27410c64777e8 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 2252c539c43f9a1431a7e8b34e3c18e9dd77a96d (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 3902205eadf35db59dbc2186c2a98b9e6182efa5 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 3d828519bd69bfcaabdd942a872679617ef06739 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 7d6bc28cfe5c8e3a279b4b4bdeed6698b2702685 (affected, git); ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2; < 7851263998d4269125fd6cb3fdbfc7c6db853859 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.12 (affected); ≥ 0; < 2.6.12 (unaffected, semver); ≥ 5.4.295; ≤ 5.4.* (unaffected, semver); ≥ 5.10.239; ≤ 5.10.* (unaffected, semver); ≥ 5.15.186; ≤ 5.15.* (unaffected, semver); ≥ 6.1.142; ≤ 6.1.* (unaffected, semver); ≥ 6.6.95; ≤ 6.6.* (unaffected, semver); ≥ 6.12.35; ≤ 6.12.* (unaffected, semver); ≥ 6.15.4; ≤ 6.15.* (unaffected, semver); ≥ 6.16; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-05; percentile 9.99%

- 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/5e0d00992118e234ebf29d5145c1cc920342777e (CNA: Linux)

- https://git.kernel.org/stable/c/c12430edd92fd49a4800b0f3fb395b50cb16bcc1 (CNA: Linux)

- https://git.kernel.org/stable/c/287b4f085d2ca3375cf1ee672af27410c64777e8 (CNA: Linux)

- https://git.kernel.org/stable/c/2252c539c43f9a1431a7e8b34e3c18e9dd77a96d (CNA: Linux)

- https://git.kernel.org/stable/c/3902205eadf35db59dbc2186c2a98b9e6182efa5 (CNA: Linux)

- https://git.kernel.org/stable/c/3d828519bd69bfcaabdd942a872679617ef06739 (CNA: Linux)

- https://git.kernel.org/stable/c/7d6bc28cfe5c8e3a279b4b4bdeed6698b2702685 (CNA: Linux)

- https://git.kernel.org/stable/c/7851263998d4269125fd6cb3fdbfc7c6db853859 (CNA: Linux)

- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html (ADP: CVE)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2025-38190; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-38190; retrieved 2026-11-05; source updated Not reported

Revision: d0bbefa4d42cdf4a6f9275d4af44e6b090ae4c1a8b4e67bc67fafda6e101866a

Canonical: https://y2.dev/cve/CVE-2025-38190

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