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.

Weaknesses 1

Affected Products 4

References 5

• git.kernel.org https://git.kernel.org/stable/c/0090d6e1b210551e63cf43958dc7a1ec942cdde9
  Patch
• git.kernel.org https://git.kernel.org/stable/c/092571ef9a812566c8f2c9038d9c2a64c49788d6
  Patch
• git.kernel.org https://git.kernel.org/stable/c/17765964703b88d8befd899f8501150bb7e07e43
  Patch
• git.kernel.org https://git.kernel.org/stable/c/a0cc006f4214b87e70983c692e05bb36c59b5752
  Patch
• lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
  Mailing ListThird Party Advisory

Remediation

• git.kernel.org https://git.kernel.org/stable/c/0090d6e1b210551e63cf43958dc7a1ec942cdde9
  Patch
• git.kernel.org https://git.kernel.org/stable/c/092571ef9a812566c8f2c9038d9c2a64c49788d6
  Patch
• git.kernel.org https://git.kernel.org/stable/c/17765964703b88d8befd899f8501150bb7e07e43
  Patch
• git.kernel.org https://git.kernel.org/stable/c/a0cc006f4214b87e70983c692e05bb36c59b5752
  Patch