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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Nov 3, 2025

btrfs: zoned: fix use-after-free due to race with dev replace

CVE-2024-39496

Description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: zoned: fix use-after-free due to race with dev replace

While loading a zone's info during creation of a block group, we can race with a device replace operation and then trigger a use-after-free on the device that was just replaced (source device of the replace operation).

This happens because at btrfs_load_zone_info() we extract a device from the chunk map into a local variable and then use the device while not under the protection of the device replace rwsem. So if there's a device replace operation happening when we extract the device and that device is the source of the replace operation, we will trigger a use-after-free if before we finish using the device the replace operation finishes and frees the device.

Fix this by enlarging the critical section under the protection of the device replace rwsem so that all uses of the device are done inside the critical section.

Affected products

48

Patches

4
a0cc006f4214
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
092571ef9a81
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
0090d6e1b210
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
17765964703b
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

4

News mentions

0

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