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CVE-2026-45895

quota: fix livelock between quotactl and freeze_super

Description

In the Linux kernel, the following vulnerability has been resolved: quota: fix livelock between quotactl and freeze_super When a filesystem is frozen, quotactl_block() enters a retry loop waiting for the filesystem to thaw. It acquires s_umount, checks the freeze state, drops s_umount and uses sb_start_write() - sb_end_write() pair to wait for the unfreeze. However, this retry loop can trigger a livelock issue, specifically on kernels with preemption disabled. The mechanism is as follows: 1. freeze_super() sets SB_FREEZE_WRITE and calls sb_wait_write(). 2. sb_wait_write() calls percpu_down_write(), which initiates synchronize_rcu(). 3. Simultaneously, quotactl_block() spins in its retry loop, immediately executing the sb_start_write() - sb_end_write() pair. 4. Because the kernel is non-preemptible and the loop contains no scheduling points, quotactl_block() never yields the CPU. This prevents that CPU from reaching an RCU quiescent state. 5. synchronize_rcu() in the freezer thread waits indefinitely for the quotactl_block() CPU to report a quiescent state. 6. quotactl_block() spins indefinitely waiting for the freezer to advance, which it cannot do as it is blocked on the RCU sync. This results in a hang of the freezer process and 100% CPU usage by the quota process. While this can occur intermittently on multi-core systems, it is reliably reproducing on a node with the following script, running both the freezer and the quota toggle on the same CPU: # mkfs.ext4 -O quota /dev/sda 2g && mkdir a_mount # mount /dev/sda -o quota,usrquota,grpquota a_mount # taskset -c 3 bash -c "while true; do xfs_freeze -f a_mount; \ xfs_freeze -u a_mount; done" & # taskset -c 3 bash -c "while true; do quotaon a_mount; \ quotaoff a_mount; done" & Adding cond_resched() to the retry loop fixes the issue. It acts as an RCU quiescent state, allowing synchronize_rcu() in percpu_down_write() to complete.

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-45895, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.16% · top 95% of all CVEs (9 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 576215cffdefc1f0ceebffd87abb390926e6b037 – < 37ccd48cf35f3c8b9f2ea961a7b486b91eb71a82
    • affected 576215cffdefc1f0ceebffd87abb390926e6b037 – < 414259caf81a397563fc9baca9c0ef856c4a97cf
    • affected 576215cffdefc1f0ceebffd87abb390926e6b037 – < 02bb1500f1479750e6557c8044f6a2d7e9d30c12
    • affected 576215cffdefc1f0ceebffd87abb390926e6b037 – < 53b2314b26b6640a3657cc924de63a1a8f26ac4d
    • affected 576215cffdefc1f0ceebffd87abb390926e6b037 – < 77449e453dfc006ad738dec55374c4cbc056fd39

  • Linux · Linux

    • affected 6.5
    • unaffected < 6.5
    • unaffected 6.6.128 – ≤ 6.6.*
    • unaffected 6.12.75 – ≤ 6.12.*
    • unaffected 6.18.14 – ≤ 6.18.*
    • unaffected 6.19.4 – ≤ 6.19.*
    • unaffected 7.0 – ≤ *

References

5

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .