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CVE-2023-53641— wifi: ath9k: hif_usb: fix memory leak of remain_skbs

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于hif_usb模块在设备去初始化或挂起时未释放remain_skbs内存，可能导致内存泄漏。

AI Predicted 3.3 Difficulty: Moderate EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fb9987d0f748c983bb795a86f47522313f701a08< 6719e3797ec52cd144c8a5ba8aaab36674800585 affected
fb9987d0f748c983bb795a86f47522313f701a08< d9899318660791141ea6002fda5577b2c5d7386e affected
fb9987d0f748c983bb795a86f47522313f701a08< 320d760a35273aa815d58b57e4fd9ba5279a3489 affected
fb9987d0f748c983bb795a86f47522313f701a08< 59073060fe0950c6ecbe12bdc06469dcac62128d affected
fb9987d0f748c983bb795a86f47522313f701a08< 9b9356a3014123f0ce4b50d9278c1265173150ab affected
fb9987d0f748c983bb795a86f47522313f701a08< f0931fc8f4b6847c72e170d2326861c0a081d680 affected
fb9987d0f748c983bb795a86f47522313f701a08< 8f02d538878c9b1501f624595eb22ee4e5e0ff84 affected
fb9987d0f748c983bb795a86f47522313f701a08< 7654cc03eb699297130b693ec34e25f77b17c947 affected
… +10 more rows
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I. Basic Information for CVE-2023-53641

Vulnerability Information
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Vulnerability Title
wifi: ath9k: hif_usb: fix memory leak of remain_skbs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于hif_usb模块在设备去初始化或挂起时未释放remain_skbs内存，可能导致内存泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux fb9987d0f748c983bb795a86f47522313f701a08 ~ 6719e3797ec52cd144c8a5ba8aaab36674800585 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2023-53641

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III. Intelligence Information for CVE-2023-53641

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Patches & Fixes for CVE-2023-53641 (8)

Same Patch Batch · Linux · 2025-10-07 · 118 CVEs total

CVE-2023-53629 9.8 CRITICAL fs: dlm: fix use after free in midcomms commit
CVE-2023-53630 8.8 HIGH iommufd: Fix unpinning of pages when an access is present
CVE-2023-53676 8.8 HIGH scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()
CVE-2023-53675 8.8 HIGH scsi: ses: Fix possible desc_ptr out-of-bounds accesses
CVE-2023-53673 8.8 HIGH Bluetooth: hci_event: call disconnect callback before deleting conn
CVE-2023-53679 8.3 HIGH wifi: mt7601u: fix an integer underflow
CVE-2023-53635 8.2 HIGH netfilter: conntrack: fix wrong ct->timeout value
CVE-2022-50555 7.8 HIGH tipc: fix a null-ptr-deref in tipc_topsrv_accept
CVE-2023-53659 7.8 HIGH iavf: Fix out-of-bounds when setting channels on remove
CVE-2023-53619 7.8 HIGH netfilter: conntrack: Avoid nf_ct_helper_hash uses after free
CVE-2023-53643 7.8 HIGH nvme-tcp: don't access released socket during error recovery
CVE-2023-53660 7.8 HIGH bpf, cpumap: Handle skb as well when clean up ptr_ring
CVE-2023-53645 7.8 HIGH bpf: Make bpf_refcount_acquire fallible for non-owning refs
CVE-2023-53646 7.8 HIGH drm/i915/perf: add sentinel to xehp_oa_b_counters
CVE-2023-53669 7.8 HIGH tcp: fix skb_copy_ubufs() vs BIG TCP
CVE-2023-53626 7.8 HIGH ext4: fix possible double unlock when moving a directory
CVE-2023-53627 7.8 HIGH scsi: hisi_sas: Grab sas_dev lock when traversing the members of sas_dev.list
CVE-2022-50528 7.8 HIGH drm/amdkfd: Fix memory leakage
CVE-2023-53683 7.8 HIGH fs: hfsplus: remove WARN_ON() from hfsplus_cat_{read,write}_inode()
CVE-2022-50543 7.8 HIGH RDMA/rxe: Fix mr->map double free

Showing top 20 of 118 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53641

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