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PUBLISHED

CVE-2024-26773

ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-03

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found() Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group

Product status

Default status
unaffected

1da177e4c3f4 before 21f8cfe79f77
affected

1da177e4c3f4 before 260fc96283c0
affected

1da177e4c3f4 before 927794a02169
affected

1da177e4c3f4 before 4c21fa60a6f4
affected

1da177e4c3f4 before f97e75fa4e12
affected

1da177e4c3f4 before 0184747b552d
affected

1da177e4c3f4 before a2576ae9a35c
affected

1da177e4c3f4 before 4530b3660d39
affected

Default status
affected

4.19.308
unaffected

5.4.270
unaffected

5.10.211
unaffected

5.15.150
unaffected

6.1.80
unaffected

6.6.19
unaffected

6.7.7
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea

https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d

https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03

https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5

https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36

https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1

https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe

https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53

cve.org CVE-2024-26773

nvd.nist.gov CVE-2024-26773

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