Answer in brief
CVE-2026-23124 records a Unknown severity vulnerability in ipv6: annotate data-race in ndisc_router_discovery(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 <4630897eb1a039b5d7b737b8dc9521d9d4b568b5 || >=49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 <2619499169fb1c2ac4974b0f2d87767fb543582b || >=49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 <fad8f4ff7928f4d52a062ffdcffa484989c79c47 || >=49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 <2a2b9d25f801afecf2f83cacce98afa8fd73e3c9 || >=49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 <e3c1040252e598f7b4e33a42dc7c38519bc22428 || >=49b99da2c9ce13ffcd93fe3a0f5670791c1d76f7 <9a063f96d87efc3a6cc667f8de096a3d38d74bb5 | 4630897eb1a039b5d7b737b8dc9521d9d4b568b5, 2619499169fb1c2ac4974b0f2d87767fb543582b, fad8f4ff7928f4d52a062ffdcffa484989c79c47, 2a2b9d25f801afecf2f83cacce98afa8fd73e3c9, e3c1040252e598f7b4e33a42dc7c38519bc22428, 9a063f96d87efc3a6cc667f8de096a3d38d74bb5 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Feb 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 19, 2026
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
Quoted source text, attributed separately from HOL analysis.