CVE-2026-53050
quota: Fix race of dquot_scan_active() with quota deactivation
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| 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) Other versions: unaffected |
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) Other versions: affected |
CNA: Linux |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.8 high |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CNA: Linux |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457cCNA: Linux
- https://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3bCNA: Linux
- https://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4aCNA: Linux
- https://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5CNA: Linux
- https://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75CNA: Linux
- https://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350CNA: Linux
- https://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1CNA: Linux
- https://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2dCNA: Linux
- https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlADP: siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP
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