Release Date: | 2024-04-03 |
In the Linux kernel, the following vulnerability has been resolved:\next4: fix double-free of blocks due to wrong extents moved_len\nIn ext4_move_extents(), moved_len is only updated when all moves are\nsuccessfully executed, and only discards orig_inode and donor_inode\npreallocations when moved_len is not zero. When the loop fails to exit\nafter successfully moving some extents, moved_len is not updated and\nremains at 0, so it does not discard the preallocations.\nIf the moved extents overlap with the preallocated extents, the\noverlapped extents are freed twice in ext4_mb_release_inode_pa() and\next4_process_freed_data() (as described in commit 94d7c16cbbbd ('ext4:\nFix double-free of blocks with EXT4_IOC_MOVE_EXT')), and bb_free is\nincremented twice. Hence when trim is executed, a zero-division bug is\ntriggered in mb_update_avg_fragment_size() because bb_free is not zero\nand bb_fragments is zero.\nTherefore, update move_len after each extent move to avoid the issue.
See more information about CVE-2024-26704 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.
Base Score: | 5.5 | CVSS Vector: | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Attack Vector: | Local network | Attack Complexity: | Low |
Privileges Required: | Low | User Interaction: | None |
Scope: | Unchanged | Confidentiality Impact: | None |
Integrity Impact: | None | Availability Impact: | High |
Platform | Errata | Release Date |
Oracle Linux version 6 (kernel-uek) | ELSA-2024-12606 | 2024-09-02 |
Oracle Linux version 7 (kernel-uek) | ELSA-2024-12606 | 2024-09-02 |
Oracle Linux version 8 (kernel) | ELSA-2024-5101 | 2024-08-08 |
Oracle VM version 3 (kernel-uek) | OVMSA-2024-0011 | 2024-09-03 |
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