CVE-2026-23124

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Feb 14, 2026
Source updated: Oct 19, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

ipv6: annotate data-race in ndisc_router_discovery()

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->ra_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 < IPV6_MIN_MTU || mtu > skb->dev->mtu) 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 -> 0xe5400659

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: unaffected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7	`affected`	git	4630897eb1a039b5d7b737b8dc9521d9d4b568b5	Unavailable	None listed
49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7	`affected`	git	2619499169fb1c2ac4974b0f2d87767fb543582b	Unavailable	None listed
49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7	`affected`	git	fad8f4ff7928f4d52a062ffdcffa484989c79c47	Unavailable	None listed
49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7	`affected`	git	2a2b9d25f801afecf2f83cacce98afa8fd73e3c9	Unavailable	None listed
49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7	`affected`	git	e3c1040252e598f7b4e33a42dc7c38519bc22428	Unavailable	None listed
49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7	`affected`	git	9a063f96d87efc3a6cc667f8de096a3d38d74bb5	Unavailable	None listed

Linux

Vendor: Linux
Product: Linux
Platforms: Unknown
Default status: affected

Linux · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
5.15	`affected`	Unavailable	Unavailable	Unavailable	None listed
0	`unaffected`	semver	5.15	Unavailable	None listed
5.15.199	`unaffected`	semver	Unavailable	5.15.*	None listed
6.1.162	`unaffected`	semver	Unavailable	6.1.*	None listed
6.6.122	`unaffected`	semver	Unavailable	6.6.*	None listed
6.12.68	`unaffected`	semver	Unavailable	6.12.*	None listed
6.18.8	`unaffected`	semver	Unavailable	6.18.*	None listed
6.19	`unaffected`	original_commit_for_fix	Unavailable	*	None listed