{"cve":"CVE-2026-23203","nvd":{"published":"2026-02-14T17:15:58.177","modified":"2026-06-17T10:21:05.570","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: cpsw_new: Execute ndo_set_rx_mode callback in a work queue\n\nCommit 1767bb2d47b7 (\"ipv6: mcast: Don't hold RTNL for\nIPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP.\") removed the RTNL lock for\nIPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP operations. However, this\nchange triggered the following call trace on my BeagleBone Black board:\n  WARNING: net/8021q/vlan_core.c:236 at vlan_for_each+0x120/0x124, CPU#0: rpcbind/496\n  RTNL: assertion failed at net/8021q/vlan_core.c (236)\n  Modules linked in:\n  CPU: 0 UID: 997 PID: 496 Comm: rpcbind Not tainted 6.19.0-rc6-next-20260122-yocto-standard+ #8 PREEMPT\n  Hardware name: Generic AM33XX (Flattened Device Tree)\n  Call trace:\n   unwind_backtrace from show_stack+0x28/0x2c\n   show_stack from dump_stack_lvl+0x30/0x38\n   dump_stack_lvl from __warn+0xb8/0x11c\n   __warn from warn_slowpath_fmt+0x130/0x194\n   warn_slowpath_fmt from vlan_for_each+0x120/0x124\n   vlan_for_each from cpsw_add_mc_addr+0x54/0xd8\n   cpsw_add_mc_addr from __hw_addr_ref_sync_dev+0xc4/0xec\n   __hw_addr_ref_sync_dev from __dev_mc_add+0x78/0x88\n   __dev_mc_add from igmp6_group_added+0x84/0xec\n   igmp6_group_added from __ipv6_dev_mc_inc+0x1fc/0x2f0\n   __ipv6_dev_mc_inc from __ipv6_sock_mc_join+0x124/0x1b4\n   __ipv6_sock_mc_join from do_ipv6_setsockopt+0x84c/0x1168\n   do_ipv6_setsockopt from ipv6_setsockopt+0x88/0xc8\n   ipv6_setsockopt from do_sock_setsockopt+0xe8/0x19c\n   do_sock_setsockopt from __sys_setsockopt+0x84/0xac\n   __sys_setsockopt from ret_fast_syscall+0x0/0x5\n\nThis trace occurs because vlan_for_each() is called within\ncpsw_ndo_set_rx_mode(), which expects the RTNL lock to be held.\nSince modifying vlan_for_each() to operate without the RTNL lock is not\nstraightforward, and because ndo_set_rx_mode() is invoked both with and\nwithout the RTNL lock across different code paths, simply adding\nrtnl_lock() in cpsw_ndo_set_rx_mode() is not a viable solution.\n\nTo resolve this issue, we opt to execute the actual processing within\na work queue, following the approach used by the icssg-prueth driver.","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":[],"references":["https://git.kernel.org/stable/c/c0b5dc73a38f954e780f93a549b8fe225235c07a","https://git.kernel.org/stable/c/d5b3a669866977dc87fd56fcf00a70df1536d258"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:23:35.260773158+00:00"},"epss":{"cve":"CVE-2026-23203","score":0.00116,"percentile":0.0161,"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."]}