- 5.5MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 13 months later
· 13 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < 6719e3797ec52cd144c8a5ba8aaab36674800585
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < d9899318660791141ea6002fda5577b2c5d7386e
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < 320d760a35273aa815d58b57e4fd9ba5279a3489
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < 59073060fe0950c6ecbe12bdc06469dcac62128d
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < 9b9356a3014123f0ce4b50d9278c1265173150ab
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < f0931fc8f4b6847c72e170d2326861c0a081d680
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < 8f02d538878c9b1501f624595eb22ee4e5e0ff84
- affected fb9987d0f748c983bb795a86f47522313f701a08 – < 7654cc03eb699297130b693ec34e25f77b17c947
- affected 2.6.35
- unaffected < 2.6.35
- unaffected 4.19.283 – ≤ 4.19.*
- unaffected 5.4.243 – ≤ 5.4.*
- unaffected 5.10.180 – ≤ 5.10.*
- unaffected 5.15.111 – ≤ 5.15.*
- unaffected 6.1.28 – ≤ 6.1.*
- unaffected 6.2.15 – ≤ 6.2.*
- unaffected 6.3.2 – ≤ 6.3.*
- unaffected 6.4 – ≤ *
References
References8
- https://git.kernel.org/stable/c/6719e3797ec52cd144c8a5ba8aaab36674800585 (opens in a new tab)
- https://git.kernel.org/stable/c/d9899318660791141ea6002fda5577b2c5d7386e (opens in a new tab)
- https://git.kernel.org/stable/c/320d760a35273aa815d58b57e4fd9ba5279a3489 (opens in a new tab)
- https://git.kernel.org/stable/c/59073060fe0950c6ecbe12bdc06469dcac62128d (opens in a new tab)
- https://git.kernel.org/stable/c/9b9356a3014123f0ce4b50d9278c1265173150ab (opens in a new tab)
- https://git.kernel.org/stable/c/f0931fc8f4b6847c72e170d2326861c0a081d680 (opens in a new tab)
- https://git.kernel.org/stable/c/8f02d538878c9b1501f624595eb22ee4e5e0ff84 (opens in a new tab)
- https://git.kernel.org/stable/c/7654cc03eb699297130b693ec34e25f77b17c947 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-31996 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-53641)Record last updated .