{"id":"DEBIAN-CVE-2024-26631","details":"In the Linux kernel, the following vulnerability has been resolved:  ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work  idev-\u003emc_ifc_count can be written over without proper locking.  Originally found by syzbot [1], fix this issue by encapsulating calls to mld_ifc_stop_work() (and mld_gq_stop_work() for good measure) with mutex_lock() and mutex_unlock() accordingly as these functions should only be called with mc_lock per their declarations.  [1] BUG: KCSAN: data-race in ipv6_mc_down / mld_ifc_work  write to 0xffff88813a80c832 of 1 bytes by task 3771 on cpu 0:  mld_ifc_stop_work net/ipv6/mcast.c:1080 [inline]  ipv6_mc_down+0x10a/0x280 net/ipv6/mcast.c:2725  addrconf_ifdown+0xe32/0xf10 net/ipv6/addrconf.c:3949  addrconf_notify+0x310/0x980  notifier_call_chain kernel/notifier.c:93 [inline]  raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461  __dev_notify_flags+0x205/0x3d0  dev_change_flags+0xab/0xd0 net/core/dev.c:8685  do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916  rtnl_group_changelink net/core/rtnetlink.c:3458 [inline]  __rtnl_newlink net/core/rtnetlink.c:3717 [inline]  rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754  rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558  netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545  rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576  netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]  netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368  netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910  ...  write to 0xffff88813a80c832 of 1 bytes by task 22 on cpu 1:  mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653  process_one_work kernel/workqueue.c:2627 [inline]  process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700  worker_thread+0x525/0x730 kernel/workqueue.c:2781  ...","modified":"2026-09-15T09:03:04.698075903Z","published":"2024-03-18T11:15:09.483Z","upstream":["CVE-2024-26631"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-26631"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.76-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26631.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26631.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.15-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-26631.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}