CVE-2023-53641: In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: hif_usb: fix memory leak of remain_skbs hif_dev->remain_skb is allocated and…

PriorityP419medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.15%

4.3th percentile

In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: hif_usb: fix memory leak of remain_skbs hif_dev->remain_skb is allocated and used exclusively in ath9k_hif_usb_rx_stream(). It is implied that an allocated remain_skb is processed and subsequently freed (in error paths) only during the next call of ath9k_hif_usb_rx_stream(). So, if the urbs are deallocated between those two calls due to the device deinitialization or suspend, it is possible that ath9k_hif_usb_rx_stream() is not called next time and the allocated remain_skb is leaked. Our local Syzkaller instance was able to trigger that. remain_skb makes sense when receiving two consecutive urbs which are logically linked together, i.e. a specific data field from the first skb indicates a cached skb to be allocated, memcpy'd with some data and subsequently processed in the next call to ath9k_hif_usb_rx_stream(). Urbs deallocation supposedly makes that link irrelevant so we need to free the cached skb in those cases. Fix the leak by introducing a function to explicitly free remain_skb (if it is not NULL) when the rx urbs have been deallocated. remain_skb is NULL when it has not been allocated at all (hif_dev struct is kzalloced) or when it has been processed in next call to ath9k_hif_usb_rx_stream(). Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Affected

21 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.37-1 (bookworm)	linux 6.1.37-1 (bookworm)
linux	linux	—	—
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < 6719e3797ec52cd144c8a5ba8aaab36674800585	6719e3797ec52cd144c8a5ba8aaab36674800585
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < d9899318660791141ea6002fda5577b2c5d7386e	d9899318660791141ea6002fda5577b2c5d7386e
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < 320d760a35273aa815d58b57e4fd9ba5279a3489	320d760a35273aa815d58b57e4fd9ba5279a3489
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < 59073060fe0950c6ecbe12bdc06469dcac62128d	59073060fe0950c6ecbe12bdc06469dcac62128d
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < 9b9356a3014123f0ce4b50d9278c1265173150ab	9b9356a3014123f0ce4b50d9278c1265173150ab
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < f0931fc8f4b6847c72e170d2326861c0a081d680	f0931fc8f4b6847c72e170d2326861c0a081d680
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < 8f02d538878c9b1501f624595eb22ee4e5e0ff84	8f02d538878c9b1501f624595eb22ee4e5e0ff84
linux	linux	>= fb9987d0f748c983bb795a86f47522313f701a08 < 7654cc03eb699297130b693ec34e25f77b17c947	7654cc03eb699297130b693ec34e25f77b17c947
linux	linux_kernel	>= 0 < 5.10.191-1	5.10.191-1
linux	linux_kernel	>= 0 < 6.1.37-1	6.1.37-1
linux	linux_kernel	>= 0 < 6.3.7-1	6.3.7-1
linux	linux_kernel	>= 0 < 6.3.7-1	6.3.7-1
linux	linux_kernel	>= 2.6.35 < 4.19.283	4.19.283
linux	linux_kernel	>= 4.20 < 5.4.243	5.4.243
linux	linux_kernel	>= 5.11 < 5.15.111	5.15.111
linux	linux_kernel	>= 5.16 < 6.1.28	6.1.28
linux	linux_kernel	>= 5.5 < 5.10.180	5.10.180
linux	linux_kernel	>= 6.2 < 6.2.15	6.2.15
linux	linux_kernel	>= 6.3 < 6.3.2	6.3.2

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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