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CVE-2026-31701— ALSA: caiaq: take a reference on the USB device in create_card()

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caiaq驱动未对USB设备引用计数，可能导致在USB设备释放后访问cdev->chip.dev导致释放后重用。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.16% · P5

Affected Version Matrix 29

VendorProduct Version RangeStatus
Linux Linux 4dd821dcbfcecf7af6a08370b0b217cde2818acf< 493b3a682ededc804555755f5d2193201339612d affected
cadf1d8e9ddcd74584ec961aeac14ac549b261d8< dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e affected
237f3faf0177bdde728fa3106d730d806436aa4d< ac7345f68cda6989016d85d63f7b244c064aa8f6 affected
4507a8b9b30344c5ddd8219945f446d47e966a6d< f6634af5de728a46792f674a66d7843570cb68f7 affected
a3f9314752dbb6f6aa1f0f2b4c58243bda800738< 1d9be95aee6c6246a21752e60c9519902649f482 affected
b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c< 6473ed16df1fe88051140611b3eb9a49be7f429e affected
b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c< 59b622a043cffc58b7638cd85ae6c30a0904f8e6 affected
b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c< 80bb50e2d459213cccff3111d5ef98ed4238c0d5 affected
… +21 more rows
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I. Basic Information for CVE-2026-31701

Vulnerability Information
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Vulnerability Title
ALSA: caiaq: take a reference on the USB device in create_card()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: take a reference on the USB device in create_card() The caiaq driver stores a pointer to the parent USB device in cdev->chip.dev but never takes a reference on it. The card's private_free callback, snd_usb_caiaq_card_free(), can run asynchronously via snd_card_free_when_closed() after the USB device has already been disconnected and freed, so any access to cdev->chip.dev in that path dereferences a freed usb_device. On top of the refcounting issue, the current card_free implementation calls usb_reset_device(cdev->chip.dev). A reset in a free callback is inappropriate: the device is going away, the call takes the device lock in a teardown context, and the reset races with the disconnect path that the callback is already cleaning up after. Take a reference on the USB device in create_card() with usb_get_dev(), drop it with usb_put_dev() in the free callback, and remove the usb_reset_device() call.
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caiaq驱动未对USB设备引用计数，可能导致在USB设备释放后访问cdev->chip.dev导致释放后重用。
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 4dd821dcbfcecf7af6a08370b0b217cde2818acf ~ 493b3a682ededc804555755f5d2193201339612d -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-31701

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III. Intelligence Information for CVE-2026-31701

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Patches & Fixes for CVE-2026-31701 (8)

Same Patch Batch · Linux · 2026-05-01 · 146 CVEs total

CVE-2026-43011 9.8 CRITICAL net/x25: Fix potential double free of skb
CVE-2026-43037 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
CVE-2026-31705 9.8 CRITICAL ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
CVE-2026-43038 9.8 CRITICAL ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
CVE-2026-43039 9.8 CRITICAL net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
CVE-2026-31718 9.8 CRITICAL ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger
CVE-2026-43018 8.8 HIGH Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
CVE-2026-31773 8.8 HIGH Bluetooth: SMP: derive legacy responder STK authentication from MITM state
CVE-2026-31739 8.8 HIGH crypto: tegra - Add missing CRYPTO_ALG_ASYNC
CVE-2026-31735 8.8 HIGH iommupt: Fix short gather if the unmap goes into a large mapping
CVE-2026-31717 8.8 HIGH ksmbd: validate owner of durable handle on reconnect
CVE-2026-43048 8.8 HIGH HID: core: Mitigate potential OOB by removing bogus memset()
CVE-2026-31709 8.8 HIGH smb: client: validate the whole DACL before rewriting it in cifsacl
CVE-2026-31706 8.8 HIGH ksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()
CVE-2026-31712 8.3 HIGH ksmbd: require minimum ACE size in smb_check_perm_dacl()
CVE-2026-31771 8.1 HIGH Bluetooth: hci_event: move wake reason storage into validated event handlers
CVE-2026-31779 8.1 HIGH wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()
CVE-2026-43051 8.1 HIGH HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq
CVE-2026-31708 8.1 HIGH smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
CVE-2026-31695 7.8 HIGH wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31701

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