Vulnerabilities > CVE-2024-26974 - Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in multiple products
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: qat - resolve race condition during AER recovery During the PCI AER system's error recovery process, the kernel driver may encounter a race condition with freeing the reset_data structure's memory. If the device restart will take more than 10 seconds the function scheduling that restart will exit due to a timeout, and the reset_data structure will be freed. However, this data structure is used for completion notification after the restart is completed, which leads to a UAF bug. This results in a KFENCE bug notice. BUG: KFENCE: use-after-free read in adf_device_reset_worker+0x38/0xa0 [intel_qat] Use-after-free read at 0x00000000bc56fddf (in kfence-#142): adf_device_reset_worker+0x38/0xa0 [intel_qat] process_one_work+0x173/0x340 To resolve this race condition, the memory associated to the container of the work_struct is freed on the worker if the timeout expired, otherwise on the function that schedules the worker. The timeout detection can be done by checking if the caller is still waiting for completion or not by using completion_done() function.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions via Symbolic Links This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to her. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file she will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
References
- https://git.kernel.org/stable/c/0c2cf5142bfb634c0ef0a1a69cdf37950747d0be
- https://git.kernel.org/stable/c/0c2cf5142bfb634c0ef0a1a69cdf37950747d0be
- https://git.kernel.org/stable/c/226fc408c5fcd23cc4186f05ea3a09a7a9aef2f7
- https://git.kernel.org/stable/c/226fc408c5fcd23cc4186f05ea3a09a7a9aef2f7
- https://git.kernel.org/stable/c/4ae5a97781ce7d6ecc9c7055396535815b64ca4f
- https://git.kernel.org/stable/c/4ae5a97781ce7d6ecc9c7055396535815b64ca4f
- https://git.kernel.org/stable/c/7d42e097607c4d246d99225bf2b195b6167a210c
- https://git.kernel.org/stable/c/7d42e097607c4d246d99225bf2b195b6167a210c
- https://git.kernel.org/stable/c/8a5a7611ccc7b1fba8d933a9f22a2e76859d94dc
- https://git.kernel.org/stable/c/8a5a7611ccc7b1fba8d933a9f22a2e76859d94dc
- https://git.kernel.org/stable/c/8e81cd58aee14a470891733181a47d123193ba81
- https://git.kernel.org/stable/c/8e81cd58aee14a470891733181a47d123193ba81
- https://git.kernel.org/stable/c/bb279ead42263e9fb09480f02a4247b2c287d828
- https://git.kernel.org/stable/c/bb279ead42263e9fb09480f02a4247b2c287d828
- https://git.kernel.org/stable/c/d03092550f526a79cf1ade7f0dfa74906f39eb71
- https://git.kernel.org/stable/c/d03092550f526a79cf1ade7f0dfa74906f39eb71
- https://git.kernel.org/stable/c/daba62d9eeddcc5b1081be7d348ca836c83c59d7
- https://git.kernel.org/stable/c/daba62d9eeddcc5b1081be7d348ca836c83c59d7
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html