CVE-2026-53050

Description

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.

CVSS breakdown

Affected products

• Linux / Linux22c06bf1f99ec3ec16b1a81342becba4c59a1f16 – 2bdc80f4619411e5bd4a3ef23f51e14021ed457c
• Linux / Linux56e96b38d2f7cd95b3c30eb70decac7233915e0a – f9438cb8c8ec3adc84b2b450a3aab0123d074c3b
• Linux / Linux12a820a9923c11e8e898da9f82c8aded70cdcd16 – ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a
• Linux / Linux869b6ea1609f655a43251bf41757aa44e5350a8f – 6678dde265708003c2b42551af4a2e3cb05decd5
• Linux / Linux869b6ea1609f655a43251bf41757aa44e5350a8f – 61e25f664dc2a08299e07d84c85776abc2350f75
• Linux / Linux869b6ea1609f655a43251bf41757aa44e5350a8f – fdd424d7c35633ac577fd87d1b043d1b8a6cd350
• Linux / Linux869b6ea1609f655a43251bf41757aa44e5350a8f – 82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1
• Linux / Linux869b6ea1609f655a43251bf41757aa44e5350a8f – e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d
• Linux / Linuxbb7e3a019b52d829949d02b64ebab37838148fbf – bb7e3a019b52d829949d02b64ebab37838148fbf
• Linux / Linux061a18239ced5eb086967a2b4451cb1cc5ce0702 – 061a18239ced5eb086967a2b4451cb1cc5ce0702
• Linux / Linux2a1ddddba6541143c8f73962f3021f1789114284 – 2a1ddddba6541143c8f73962f3021f1789114284
• Linux / Linux5.10.199 – 5.10.258
• Linux / Linux5.15.136 – 5.15.209
• Linux / Linux6.1.59 – 6.1.175
• Linux / Linux4.19.297 – 4.20
• Linux / Linux5.4.259 – 5.5
• Linux / Linux6.5.8 – 6.6
• Linux / Linux6.6 – 6.6
• Linux / Linux0 – 6.6
• Linux / Linux5.10.258 – 5.10.*
• Linux / Linux5.15.209 – 5.15.*
• Linux / Linux6.1.175 – 6.1.*
• Linux / Linux6.6.141 – 6.6.*
• Linux / Linux6.12.91 – 6.12.*
• Linux / Linux6.18.33 – 6.18.*
• Linux / Linux7.0.10 – 7.0.*
• Linux / Linux7.1 – *

References

• MISChttps://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457c
• MISChttps://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3b
• MISChttps://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a
• MISChttps://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5
• MISChttps://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75
• MISChttps://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350
• MISChttps://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1
• MISChttps://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d