Answer in brief
CVE-2024-26631 records a High severity (CVSS 7.8) vulnerability in ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work. 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.
CVSS is 7.8. 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 | >=07a7a183f22cf1e3ce5ed336fe62a6248a2f6738 <75ddcd741d2a30696f5893bc71a9d28f4ef22311 || >=2d9a93b4902be6a5504b5941dd15e9cd776aadca <62b3387beef11738eb6ce667601a28fa089fa02c || >=2d9a93b4902be6a5504b5941dd15e9cd776aadca <380540bb06bb1d1b12bdc947d1b8f56cda6b5663 || >=2d9a93b4902be6a5504b5941dd15e9cd776aadca <3cc283fd16fba72e2cefe3a6f48d7a36b0438900 || >=2d9a93b4902be6a5504b5941dd15e9cd776aadca <3bb5849675ae1d592929798a2b37ea450879c855 || >=2d9a93b4902be6a5504b5941dd15e9cd776aadca <2e7ef287f07c74985f1bf2858bedc62bd9ebf155 | 75ddcd741d2a30696f5893bc71a9d28f4ef22311, 62b3387beef11738eb6ce667601a28fa089fa02c, 380540bb06bb1d1b12bdc947d1b8f56cda6b5663, 3cc283fd16fba72e2cefe3a6f48d7a36b0438900, 3bb5849675ae1d592929798a2b37ea450879c855, 2e7ef287f07c74985f1bf2858bedc62bd9ebf155 |
| Linux/Linuxgeneric | 5.13 | Not reported |
Published upstream
Mar 18, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work idev->mc_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 ...
Quoted source text, attributed separately from HOL analysis.