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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-26773

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

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Status
Published
Published
Updated
Assigning organization
Linux

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < 21f8cfe79f776287459343e9cfa6055af61328eaaffected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < 260fc96283c0f594de18a1b045faf6d8fb42874daffected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < 927794a02169778c9c2e7b25c768ab3ea8c1dc03affected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < 4c21fa60a6f4606f6214a38f50612b17b2f738f5affected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < f97e75fa4e12b0aa0224e83fcbda8853ac2adf36affected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < 0184747b552d6b5a14db3b7fcc3b792ce64dedd1affected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < a2576ae9a35c078e488f2c573e9e6821d651fbbeaffected
  • 163a203ddb36c36d4a1c942aececda0cc8d06aa7 to < 4530b3660d396a646aad91a787b6ab37cf604b53affected

Linux Linux

Default version status: affected

  • 3.12affected
  • 0 to < 3.12unaffected
  • 4.19.308 to ≤ 4.19.*unaffected
  • 5.4.270 to ≤ 5.4.*unaffected
  • 5.10.211 to ≤ 5.10.*unaffected
  • 5.15.150 to ≤ 5.15.*unaffected
  • 6.1.80 to ≤ 6.1.*unaffected
  • 6.6.19 to ≤ 6.6.*unaffected
  • 6.7.7 to ≤ 6.7.*unaffected
  • 6.8 to ≤ *unaffected

References