CVE-2023-53641None▾ SunlitIn 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 allocate…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= fb9987d0f748c983bb795a86f47522313f701a08 < 6719e3797ec52cd144c8a5ba8aaab36674800585Linux >= fb9987d0f748c983bb795a86f47522313f701a08 < d9899318660791141ea6002fda5577b2c5d7386eLinux >= fb9987d0f748c983bb795a86f47522313f701a08 < 320d760a35273aa815d58b57e4fd9ba5279a3489Linux >= fb9987d0f748c983bb795a86f47522313f701a08 < 59073060fe0950c6ecbe12bdc06469dcac62128dLinux >= fb9987d0f748c983bb795a86f47522313f701a08 < 9b9356a3014123f0ce4b50d9278c1265173150abLinux >= fb9987d0f748c983bb795a86f47522313f701a08 < f0931fc8f4b6847c72e170d2326861c0a081d680Linux >= fb9987d0f748c983bb795a86f47522313f701a08 < 8f02d538878c9b1501f624595eb22ee4e5e0ff84Linux >= fb9987d0f748c983bb795a86f47522313f701a08 < 7654cc03eb699297130b693ec34e25f77b17c947Linux 2.6.35Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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