CVE-2023-52798 is a use-after-free vulnerability in the Linux kernel's ath11k Wi-Fi driver, affecting DFS radar-event handling in drivers/net/wireless/ath/ath11k/wmi.c. Code invoking ath11k_mac_get_ar_by_pdev_id() accessed RCU-protected active physical-device data without an RCU read-side critical section, risking access to data after it had been freed. The flaw was introduced in Linux kernel 5.6.
Upstream fixes mark the affected operation as an RCU read-side critical section and are available in kernel versions 5.10.202, 5.15.140, 6.1.64, 6.5.13, 6.6.3, and 6.7 and later stable releases. Red Hat rated the issue Low severity with a CVSS v3.1 score of 4.4, requiring local access and high privileges; RHEL 8 is fixed through RHSA-2024:7000, while RHEL 6 and 7 are unaffected and fixes for certain RHEL 8/9 real-time and RHEL 9 kernels were deferred.

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Red Hat issued RHSA-2024:7000 to fix CVE-2023-52798 in the Red Hat Enterprise Linux 8 kernel. Red Hat rated the use-after-free issue Low severity with a CVSS v3.1 score of 4.4; fixes for RHEL 8 kernel-rt and RHEL 9 kernel variants were deferred.
The Linux kernel CVE team published CVE-2023-52798 for the ath11k DFS radar-event locking issue. Fixes were made available in stable kernel versions 5.10.202, 5.15.140, 6.1.64, 6.5.13, 6.6.3, and 6.7.
The ath11k DFS radar-event handling flaw was introduced in Linux kernel version 5.6 by commit d5c65159f289. The code accessed RCU-protected active physical-device data without an RCU read-side critical section, creating a potential use-after-free condition.
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