CVE-2026-53050High· 7.8▾ TwilightIn 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_rele…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.1%
0.1% → 0.1%
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.
linux_kernel >= 4.19.297, < 4.20linux_kernel >= 5.4.259, < 5.5linux_kernel >= 5.10.199, < 5.10.258linux_kernel >= 5.15.136, < 5.15.209linux_kernel >= 6.1.59, < 6.1.175linux_kernel >= 6.5.8, < 6.6linux_kernel >= 6.6.1, < 6.6.141linux_kernel >= 6.7, < 6.12.91linux_kernel >= 6.13, < 6.18.33linux_kernel >= 6.19, < 7.0.10linux_kernel = 6.6Upgrade past the affected range:
linux_kernel 7.0.10Connected by shared product, vendor, weakness, or advisory.
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