CVE-2024-36962 (GCVE-0-2024-36962)
Vulnerability from cvelistv5
Published
2024-06-03 07:50
Modified
2025-05-04 09:12
Severity ?
6.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ks8851: Queue RX packets in IRQ handler instead of disabling BHs Currently the driver uses local_bh_disable()/local_bh_enable() in its IRQ handler to avoid triggering net_rx_action() softirq on exit from netif_rx(). The net_rx_action() could trigger this driver .start_xmit callback, which is protected by the same lock as the IRQ handler, so calling the .start_xmit from netif_rx() from the IRQ handler critical section protected by the lock could lead to an attempt to claim the already claimed lock, and a hang. The local_bh_disable()/local_bh_enable() approach works only in case the IRQ handler is protected by a spinlock, but does not work if the IRQ handler is protected by mutex, i.e. this works for KS8851 with Parallel bus interface, but not for KS8851 with SPI bus interface. Remove the BH manipulation and instead of calling netif_rx() inside the IRQ handler code protected by the lock, queue all the received SKBs in the IRQ handler into a queue first, and once the IRQ handler exits the critical section protected by the lock, dequeue all the queued SKBs and push them all into netif_rx(). At this point, it is safe to trigger the net_rx_action() softirq, since the netif_rx() call is outside of the lock that protects the IRQ handler.
References
Impacted products
Vendor Product Version
Linux Linux Version: 492337a4fbd1421b42df684ee9b34be2a2722540
Version: cba376eb036c2c20077b41d47b317d8218fe754f
Version: 49d5d70538b6b8f2a3f8f1ac30c1f921d4a0929b
Version: be0384bf599cf1eb8d337517feeb732d71f75a6f
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   Linux Linux Version: 6.1.87   ≤
Version: 6.6.28   ≤
Version: 6.8.7   ≤
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