{"id":"DEBIAN-CVE-2026-23124","details":"In the Linux kernel, the following vulnerability has been resolved:  ipv6: annotate data-race in ndisc_router_discovery()  syzbot found that ndisc_router_discovery() could read and write in6_dev-\u003era_mtu without holding a lock [1]  This looks fine, IFLA_INET6_RA_MTU is best effort.  Add READ_ONCE()/WRITE_ONCE() to document the race.  Note that we might also reject illegal MTU values (mtu \u003c IPV6_MIN_MTU || mtu \u003e skb-\u003edev-\u003emtu) in a future patch.  [1] BUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery  read to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1:   ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558   ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841   icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989   ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438   ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489   NF_HOOK include/linux/netfilter.h:318 [inline]   ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500   ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590   dst_input include/net/dst.h:474 [inline]   ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79 ...  write to 0xffff888119809c20 of 4 bytes by task 25816 on cpu 0:   ndisc_router_discovery+0x155a/0x1c90 net/ipv6/ndisc.c:1559   ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841   icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989   ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438   ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489   NF_HOOK include/linux/netfilter.h:318 [inline]   ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500   ip6_mc_input+0x27c/0x470 net/ipv6/ip6_input.c:590   dst_input include/net/dst.h:474 [inline]   ip6_rcv_finish+0x336/0x340 net/ipv6/ip6_input.c:79 ...  value changed: 0x00000000 -\u003e 0xe5400659","modified":"2026-08-27T23:05:55.763156428Z","published":"2026-02-14T15:16:07.633Z","upstream":["CVE-2026-23124"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-23124"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.162-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","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","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23124.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.69-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23124.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.18.8-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-23124.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}