{"id":"CVE-2026-98006","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: Decoupling ep1_in_urb in caiaq dev\n\nThe epq_in_urb object belonging to the caiaq device is coupled within\nthe struct snd_usb_caiaqdev","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: Decoupling ep1_in_urb in caiaq dev\n\nThe epq_in_urb object belonging to the caiaq device is coupled within\nthe struct snd_usb_caiaqdev. After usb_submit_urb…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < a3bbd2845bc7188ae18548a591da1067af997e80","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < fbfbad728da2e95d6560e43266895de5c8e844b3","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < dbd3effcbdb85394d3c4bd5ee9df785a44303333","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 671037b282eb7fe477136bd0130ffd9029eb8668","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < d6dd3c915b0d02457711d8fbaa60efc52144557f","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 0c1b907d5db2f3508375776e5b78d69591aa5626","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < d41e6c1533f09b27fc562260d41417490d2b6084","Linux >= 523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 402a9d6aab7ac787ab075adeb562c3db8b8f564b","Linux 2.6.22"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:23.490","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98006","references":[{"url":"https://git.kernel.org/stable/c/0c1b907d5db2f3508375776e5b78d69591aa5626","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/402a9d6aab7ac787ab075adeb562c3db8b8f564b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/671037b282eb7fe477136bd0130ffd9029eb8668","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a3bbd2845bc7188ae18548a591da1067af997e80","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d41e6c1533f09b27fc562260d41417490d2b6084","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d6dd3c915b0d02457711d8fbaa60efc52144557f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dbd3effcbdb85394d3c4bd5ee9df785a44303333","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fbfbad728da2e95d6560e43266895de5c8e844b3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98006.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98006"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541304"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98006"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98006"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98006.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00177,"epssPercentile":0.07163,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.861Z","slug":"CVE-2026-98006","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: Decoupling ep1_in_urb in caiaq dev\n\nThe epq_in_urb object belonging to the caiaq device is coupled within\nthe struct snd_usb_caiaqdev. After usb_submit_urb(epq_in_urb, GFP_KERNEL)\nexecutes successfully, epq_in_urb is successfully added to the urbp_list\nqueue of the dummy HCD driver (userspace specifies dummy_hcd as the HCD\nlayer driver for the caiaq USB device).\n\nWhen init_card() calls snd_usb_caiaq_send_command() which subsequently\nfails due to a timeout, and proceeds to call snd_card_free() to release\nthe card, the embedded ep1_in_urb object is also freed. When the dummy\nHCD driver detects that the URB has been unlinked, it returns the URB\n(by usb_hcd_giveback_urb()), which triggers [1].\n\nDecouple the ep1_in_urb object from the struct snd_usb_caiaqdev and switch\nto using a pointer instead. Separately allocate and manage the memory for\nep1_in_urb to prevent the release of the snd_card memory object from\ninterfering with it.\n\nmidi_out_urb has the same issue as ep1_in_urb and is handled in the same\nway.\n\n[1]\nBUG: KASAN: slab-use-after-free in usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96\nWrite of size 4 at addr ffff88803cee1050 by task ktimers/1/29\nCall Trace:\n usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96\n dummy_timer+0xaac/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:2019\n __run_hrtimer kernel/time/hrtimer.c:2067 [inline]\n __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2124\n hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2141\n\nAllocated by task 36:\n snd_card_new+0x7b/0x110 sound/core/init.c:184\n create_card sound/usb/caiaq/device.c:429 [inline]\n snd_probe+0x236/0x1af0 sound/usb/caiaq/device.c:544\n\nFreed by task 36:\n snd_card_free_when_closed sound/core/init.c:630 [inline]\n snd_card_free+0x138/0x1d0 sound/core/init.c:662\n snd_probe+0x162b/0x1af0 sound/usb/caiaq/device.c:553\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98006.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212519,"id":"CVE-2026-98006","ts":1790668196340,"field":"cvss","old":null,"new":"5.5"},{"seq":212518,"id":"CVE-2026-98006","ts":1790668196340,"field":"severity","old":"none","new":"medium"}]}