{"cve":"CVE-2022-50356","nvd":{"published":"2025-09-17T15:15:34.277","modified":"2026-06-17T05:23:18.910","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: sfb: fix null pointer access issue when sfb_init() fails\n\nWhen the default qdisc is sfb, if the qdisc of dev_queue fails to be\ninited during mqprio_init(), sfb_reset() is invoked to clear resources.\nIn this case, the q->qdisc is NULL, and it will cause gpf issue.\n\nThe process is as follows:\nqdisc_create_dflt()\n\tsfb_init()\n\t\ttcf_block_get()          --->failed, q->qdisc is NULL\n\t...\n\tqdisc_put()\n\t\t...\n\t\tsfb_reset()\n\t\t\tqdisc_reset(q->qdisc)    --->q->qdisc is NULL\n\t\t\t\tops = qdisc->ops\n\nThe following is the Call Trace information:\ngeneral protection fault, probably for non-canonical address\n0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN\nKASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]\nRIP: 0010:qdisc_reset+0x2b/0x6f0\nCall Trace:\n<TASK>\nsfb_reset+0x37/0xd0\nqdisc_reset+0xed/0x6f0\nqdisc_destroy+0x82/0x4c0\nqdisc_put+0x9e/0xb0\nqdisc_create_dflt+0x2c3/0x4a0\nmqprio_init+0xa71/0x1760\nqdisc_create+0x3eb/0x1000\ntc_modify_qdisc+0x408/0x1720\nrtnetlink_rcv_msg+0x38e/0xac0\nnetlink_rcv_skb+0x12d/0x3a0\nnetlink_unicast+0x4a2/0x740\nnetlink_sendmsg+0x826/0xcc0\nsock_sendmsg+0xc5/0x100\n____sys_sendmsg+0x583/0x690\n___sys_sendmsg+0xe8/0x160\n__sys_sendmsg+0xbf/0x160\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\nRIP: 0033:0x7f2164122d04\n</TASK>","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/2a3fc78210b9f0e85372a2435368962009f480fc","https://git.kernel.org/stable/c/723399af2795fb95687a531c9480464b5f489333","https://git.kernel.org/stable/c/c2e1e59d59fafe297779ceae1fe0e6fbebc3e745","https://git.kernel.org/stable/c/ded86c4191a3c17f8200d17a7d8a6f63b74554ae"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:10:08.713834912+00:00"},"epss":{"cve":"CVE-2022-50356","score":0.00208,"percentile":0.10883,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}