CVE-2026-31701: linux
Vulnerability summary
CVE-2026-31701 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 47 · Related 46Timeline
- 01-05-2026PublishedVulnerability first disclosed.
- 14-06-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
+0.04 pp
From 0.12% on 22-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu154 products
- linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-27.27
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1008.8
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard6 products
- linux-aws-6.18< 6.18.31-r0
- linux-azure-6.18< 6.18.31-r0 | < 6.18.24-r1
- linux-gcp-6.18< 6.18.31-r0
- linux-qemu-6.18< 6.18.24-r3
- linux-qemu-rc< 7.1_rc3-r0
Linux2 products
- linux≥ 4dd821dcbfcecf7af6a08370b0b217cde2818acf, < 493b3a682ededc804555755f5d2193201339612d | ≥ cadf1d8e9ddcd74584ec961aeac14ac549b261d8, < dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e | ≥ 237f3faf0177bdde728fa3106d730d806436aa4d, < ac7345f68cda6989016d85d63f7b244c064aa8f6 | ≥ 4507a8b9b30344c5ddd8219945f446d47e966a6d, < f6634af5de728a46792f674a66d7843570cb68f7 | ≥ a3f9314752dbb6f6aa1f0f2b4c58243bda800738, < 1d9be95aee6c6246a21752e60c9519902649f482 | ≥ b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c, < 6473ed16df1fe88051140611b3eb9a49be7f429e | ≥ b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c, < 59b622a043cffc58b7638cd85ae6c30a0904f8e6 | ≥ b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c, < 80bb50e2d459213cccff3111d5ef98ed4238c0d5 | 3993edf44d3df7b6e8c753eac6ac8783473fcbab | ebad462eec93b0f701dfe4de98990e7355283801 | dd0de8cb708951cebf727aa045e8242ba651bb52 | ≥ 5.10.231, < 5.10.258 | ≥ 5.15.174, < 5.15.209 | ≥ 6.1.120, < 6.1.175 | ≥ 6.6.64, < 6.6.136 | ≥ 6.12.2, < 6.12.84 | ≥ 4.19.325, < 4.20 | ≥ 5.4.287, < 5.5 | ≥ 6.11.11, < 6.12 | 6.13
- linux_kernelEOL≥ 6.13, < 6.18.25 | ≥ 6.19, < 7.0.2 | 6.13 | 7.1:rc1 | 7.1:rc2
Debian1 product
- linux< 6.1.176-1 | < 6.12.85-1 | < 7.0.3-1
4 vendors · 163 products
