CVE-2024-26773

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < 21f8cfe79f776287459343e9cfa6055af61328eaaffected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < 260fc96283c0f594de18a1b045faf6d8fb42874daffected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < 927794a02169778c9c2e7b25c768ab3ea8c1dc03affected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < 4c21fa60a6f4606f6214a38f50612b17b2f738f5affected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < f97e75fa4e12b0aa0224e83fcbda8853ac2adf36affected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < 0184747b552d6b5a14db3b7fcc3b792ce64dedd1affected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < a2576ae9a35c078e488f2c573e9e6821d651fbbeaffected
LinuxLinux163a203ddb36c36d4a1c942aececda0cc8d06aa7 < 4530b3660d396a646aad91a787b6ab37cf604b53affected
LinuxLinux3.12affected
LinuxLinux0 < 3.12unaffected
LinuxLinux4.19.308 <= 4.19.*unaffected
LinuxLinux5.4.270 <= 5.4.*unaffected
LinuxLinux5.10.211 <= 5.10.*unaffected
LinuxLinux5.15.150 <= 5.15.*unaffected
LinuxLinux6.1.80 <= 6.1.*unaffected
LinuxLinux6.6.19 <= 6.6.*unaffected
LinuxLinux6.7.7 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References