CVE-2024-26631 (GCVE-0-2024-26631)

Vulnerability from cvelistv5 – Published: 2024-03-18 10:07 – Updated: 2026-05-11 20:01
VLAI
Title
ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work
Summary
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 ...
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 62b3387beef11738eb6ce667601a28fa089fa02c (git)
Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 380540bb06bb1d1b12bdc947d1b8f56cda6b5663 (git)
Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 3cc283fd16fba72e2cefe3a6f48d7a36b0438900 (git)
Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 3bb5849675ae1d592929798a2b37ea450879c855 (git)
Affected: 2d9a93b4902be6a5504b5941dd15e9cd776aadca , < 2e7ef287f07c74985f1bf2858bedc62bd9ebf155 (git)
Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.148 , ≤ 5.15.* (semver)
Unaffected: 6.1.75 , ≤ 6.1.* (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Originalmente encontrado por syzbot [1], solucione este problema encapsulando las llamadas a mld_ifc_stop_work() (y mld_gq_stop_work() por si acaso) con mutex_lock() y mutex_unlock() en consecuencia, ya que estas funciones solo deben llamarse con mc_lock seg\u00fan sus declaraciones. [1] ERROR: KCSAN: carrera de datos en ipv6_mc_down / mld_ifc_work escribir en 0xffff88813a80c832 de 1 bytes por tarea 3771 en la CPU 0: mld_ifc_stop_work net/ipv6/mcast.c:1080 [en l\u00ednea] 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 [en l\u00ednea] raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461 __dev_notify_flag s+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 [en l\u00ednea] __rtnl_newlink net/core/rtnetlink.c :3717 [en l\u00ednea] 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+0 x1c /0x20 net/core/rtnetlink.c:6576 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [en l\u00ednea] netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c :1910 ... escriba en 0xffff88813a80c832 de 1 bytes por tarea 22 en la CPU 1: mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653 Process_one_work kernel/workqueue.c:2627 [en l\u00ednea] Process_scheduled_works+0x5b8/0xa30 kernel/ workqueue.c:2700 trabajador_thread+0x525/0x730 kernel/workqueue.c:2781 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T06:52:50+00:00",
      "cve": "CVE-2024-26631",
      "id": "CVE-2024-26631",
      "initial_release_date": "2024-03-18T00:00:00+00:00",
      "product_status:fixed": "280",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "56",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26631.json",
      "version": "3"
    },
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kernel/notifier.c:461\\n __dev_notify_flags+0x205/0x3d0\\n dev_change_flags+0xab/0xd0 net/core/dev.c:8685\\n do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916\\n rtnl_group_changelink net/core/rtnetlink.c:3458 [inline]\\n __rtnl_newlink net/core/rtnetlink.c:3717 [inline]\\n rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754\\n rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558\\n netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545\\n rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576\\n netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]\\n netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368\\n netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910\\n ...\\n\\nwrite to 0xffff88813a80c832 of 1 bytes by task 22 on cpu 1:\\n mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653\\n process_one_work kernel/workqueue.c:2627 [inline]\\n process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700\\n worker_thread+0x525/0x730 kernel/workqueue.c:2781\\n ...\"}], 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      "cveMetadata": "{\"cveId\": \"CVE-2024-26631\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:01:08.891Z\", \"dateReserved\": \"2024-02-19T14:20:24.136Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-18T10:07:48.346Z\", \"assignerShortName\": \"Linux\"}",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.