# CVE-2026-53050: quota: Fix race of dquot_scan_active() with quota deactivation

Status: published. Published: 2026-06-24. Updated: 2026-11-10.

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

quota: Fix race of dquot_scan_active() with quota deactivation

dquot_scan_active() can race with quota deactivation in
quota_release_workfn() like:

  CPU0 (quota_release_workfn)         CPU1 (dquot_scan_active)
  ==============================      ==============================
  spin_lock(&dq_list_lock);
  list_replace_init(
    &releasing_dquots, &rls_head);
    /* dquot X on rls_head,
       dq_count == 0,
       DQ_ACTIVE_B still set */
  spin_unlock(&dq_list_lock);
  synchronize_srcu(&dquot_srcu);
                                      spin_lock(&dq_list_lock);
                                      list_for_each_entry(dquot,
                                          &inuse_list, dq_inuse) {
                                        /* finds dquot X */
                                        dquot_active(X) -> true
                                        atomic_inc(&X->dq_count);
                                      }
                                      spin_unlock(&dq_list_lock);
  spin_lock(&dq_list_lock);
  dquot = list_first_entry(&rls_head);
  WARN_ON_ONCE(atomic_read(&dquot->dq_count));

The problem is not only a cosmetic one as under memory pressure the
caller of dquot_scan_active() can end up working on freed dquot.

Fix the problem by making sure the dquot is removed from releasing list
when we acquire a reference to it.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 22c06bf1f99ec3ec16b1a81342becba4c59a1f16; < 2bdc80f4619411e5bd4a3ef23f51e14021ed457c (affected, git); ≥ 56e96b38d2f7cd95b3c30eb70decac7233915e0a; < f9438cb8c8ec3adc84b2b450a3aab0123d074c3b (affected, git); ≥ 12a820a9923c11e8e898da9f82c8aded70cdcd16; < ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a (affected, git); ≥ 869b6ea1609f655a43251bf41757aa44e5350a8f; < 6678dde265708003c2b42551af4a2e3cb05decd5 (affected, git); ≥ 869b6ea1609f655a43251bf41757aa44e5350a8f; < 61e25f664dc2a08299e07d84c85776abc2350f75 (affected, git); ≥ 869b6ea1609f655a43251bf41757aa44e5350a8f; < fdd424d7c35633ac577fd87d1b043d1b8a6cd350 (affected, git); ≥ 869b6ea1609f655a43251bf41757aa44e5350a8f; < 82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1 (affected, git); ≥ 869b6ea1609f655a43251bf41757aa44e5350a8f; < e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d (affected, git); bb7e3a019b52d829949d02b64ebab37838148fbf (affected, git); 061a18239ced5eb086967a2b4451cb1cc5ce0702 (affected, git); 2a1ddddba6541143c8f73962f3021f1789114284 (affected, git); ≥ 5.10.199; < 5.10.258 (affected, semver); ≥ 5.15.136; < 5.15.209 (affected, semver); ≥ 6.1.59; < 6.1.175 (affected, semver); ≥ 4.19.297; < 4.20 (affected, semver); ≥ 5.4.259; < 5.5 (affected, semver); ≥ 6.5.8; < 6.6 (affected, semver). Source: CNA: Linux
- Linux / Linux: 6.6 (affected); ≥ 0; < 6.6 (unaffected, semver); ≥ 5.10.258; ≤ 5.10.* (unaffected, semver); ≥ 5.15.209; ≤ 5.15.* (unaffected, semver); ≥ 6.1.175; ≤ 6.1.* (unaffected, semver); ≥ 6.6.141; ≤ 6.6.* (unaffected, semver); ≥ 6.12.91; ≤ 6.12.* (unaffected, semver); ≥ 6.18.33; ≤ 6.18.* (unaffected, semver); ≥ 7.0.10; ≤ 7.0.* (unaffected, semver); ≥ 7.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: Linux

- CISA KEV: No listing in collected sources

- EPSS: 0.10% as of 2026-11-09; percentile 1.03%

- SSVC: Not available

- 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/2bdc80f4619411e5bd4a3ef23f51e14021ed457c (CNA: Linux)

- https://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3b (CNA: Linux)

- https://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a (CNA: Linux)

- https://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5 (CNA: Linux)

- https://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75 (CNA: Linux)

- https://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350 (CNA: Linux)

- https://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1 (CNA: Linux)

- https://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-53050; retrieved 2026-11-10; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-53050; retrieved 2026-11-10; source updated Not reported

Revision: 04de7f4056c2bb62a86931241eceffc334e4cca7b7deb4d47b0644517537b79f

Canonical: https://y2.dev/cve/CVE-2026-53050

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