CVE-2023-54021

Summary

In the Linux kernel, the following vulnerability has been resolved:

ext4: set goal start correctly in ext4_mb_normalize_request

We need to set ac_g_ex to notify the goal start used in ext4_mb_find_by_goal. Set ac_g_ex instead of ac_f_ex in ext4_mb_normalize_request. Besides we should assure goal start is in range [first_data_block, blocks_count) as ext4_mb_initialize_context does.

[ Added a check to make sure size is less than ar->pright; otherwise we could end up passing an underflowed value of ar->pright - size to ext4_get_group_no_and_offset(), which will trigger a BUG_ON later on.

  • TYT ]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < 2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530affected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < 390eee955d4de4662db5e3e9e9a9eae020432cb7affected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < cee78217a7ae72d11c2e21e1a5263b8044489823affected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < 3ca3005b502ca8ea87d6a344323b179b48c4e4a3affected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < bc4a3e1d07a86ae5845321d371190244acacb2f2affected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < c6bee8970075b256fc1b07bf4873049219380818affected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < abb330ffaa3a0ae7ce632e28c9260b461c01f19faffected
LinuxLinuxc9de560ded61faa5b754137b7753da252391c55a < b07ffe6927c75d99af534d685282ea188d9f71a6affected
LinuxLinux2.6.25affected
LinuxLinux0 < 2.6.25unaffected
LinuxLinux4.14.316 <= 4.14.*unaffected
LinuxLinux4.19.284 <= 4.19.*unaffected
LinuxLinux5.4.244 <= 5.4.*unaffected
LinuxLinux5.10.181 <= 5.10.*unaffected
LinuxLinux5.15.113 <= 5.15.*unaffected
LinuxLinux6.1.30 <= 6.1.*unaffected
LinuxLinux6.3.4 <= 6.3.*unaffected
LinuxLinux6.4 <= *unaffected

Weaknesses

References