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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-26631

ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 ...

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 07a7a183f22cf1e3ce5ed336fe62a6248a2f6738 to < 75ddcd741d2a30696f5893bc71a9d28f4ef22311affected
  • 2d9a93b4902be6a5504b5941dd15e9cd776aadca to < 62b3387beef11738eb6ce667601a28fa089fa02caffected
  • 2d9a93b4902be6a5504b5941dd15e9cd776aadca to < 380540bb06bb1d1b12bdc947d1b8f56cda6b5663affected
  • 2d9a93b4902be6a5504b5941dd15e9cd776aadca to < 3cc283fd16fba72e2cefe3a6f48d7a36b0438900affected
  • 2d9a93b4902be6a5504b5941dd15e9cd776aadca to < 3bb5849675ae1d592929798a2b37ea450879c855affected
  • 2d9a93b4902be6a5504b5941dd15e9cd776aadca to < 2e7ef287f07c74985f1bf2858bedc62bd9ebf155affected

Linux Linux

Default version status: affected

  • 5.13affected
  • 0 to < 5.13unaffected
  • 5.15.148 to ≤ 5.15.*unaffected
  • 6.1.75 to ≤ 6.1.*unaffected
  • 6.6.14 to ≤ 6.6.*unaffected
  • 6.7.2 to ≤ 6.7.*unaffected
  • 6.8 to ≤ *unaffected

References