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CVE-2022-49995

writeback: avoid use-after-free after removing device

High7.8EPSS 0.26%
Published
Updated
Reserved
Assigned by
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: writeback: avoid use-after-free after removing device When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback. Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work. Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 14 months later

    Record updated

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-2022-49995, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.26% · top 83% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

Affected products

  • Linux · Linux

    • affected 45a2966fd64147518dc5bca25f447bd0fb5359ac – < f96b9f7c1676923bce871e728bb49c0dfa5013cc
    • affected 45a2966fd64147518dc5bca25f447bd0fb5359ac – < 9a6c710f3bc10bc9cc23e1c080b53245b7f9d5b7
    • affected 45a2966fd64147518dc5bca25f447bd0fb5359ac – < f87904c075515f3e1d8f4a7115869d3b914674fd

  • Linux · Linux

    • affected 5.15
    • unaffected < 5.15
    • unaffected 5.15.64 – ≤ 5.15.*
    • unaffected 5.19.6 – ≤ 5.19.*
    • unaffected 6.0 – ≤ *

References (3)

Sources

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

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Record last updated .