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PUBLISHED

CVE-2024-26601

ext4: regenerate buddy after block freeing failed if under fc replay

Reserved:2024-02-19
Published:2024-02-24
Updated:2024-04-04

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: regenerate buddy after block freeing failed if under fc replay This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks(), fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.

Product status

Default status
unaffected

0983142c5f17 before 94ebf71bddbc
affected

6bd97bf273bd before c1317822e2de
affected

6bd97bf273bd before 78327acd4cdc
affected

6bd97bf273bd before ea42d6cffb0d
affected

6bd97bf273bd before 6b0d48647935
affected

6bd97bf273bd before c9b528c35795
affected

Default status
affected

5.11
affected

Any version before 5.11
unaffected

5.10.211
unaffected

5.15.150
unaffected

6.1.78
unaffected

6.6.17
unaffected

6.7.5
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a

https://git.kernel.org/stable/c/c1317822e2de80e78f137d3a2d99febab1b80326

https://git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4

https://git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb

https://git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581

https://git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e

cve.org CVE-2024-26601

nvd.nist.gov CVE-2024-26601

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