CVE-2026-52975 (GCVE-0-2026-52975)
Vulnerability from cvelistv5
Published
2026-06-24 16:28
Modified
2026-08-05 12:32
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bonding: 3ad: implement proper RCU rules for port->aggregator syzbot found a data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler [1] which hints at lack of proper RCU implementation. Add __rcu qualifier to port->aggregator, and add proper RCU API. [1] BUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler write to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0: ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline] bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385 worker_thread+0x58a/0x780 kernel/workqueue.c:3466 kthread+0x22a/0x280 kernel/kthread.c:436 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1: __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline] bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881 bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853 rtnl_link_info_fill net/core/rtnetlink.c:906 [inline] rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927 rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168 rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453 rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline] rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495 __dev_notify_flags+0x76/0x390 net/core/dev.c:9790 netif_change_flags+0xac/0xd0 net/core/dev.c:9823 do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180 rtnl_group_changelink net/core/rtnetlink.c:3813 [inline] __rtnl_newlink net/core/rtnetlink.c:3981 [inline] rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff88813cf5c400 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
References
Impacted products
Vendor Product Version
Linux Linux Version: 47e91f56008b43e1365e8d1d4a6813fe8a33b6f6
Version: 47e91f56008b43e1365e8d1d4a6813fe8a33b6f6
Version: 47e91f56008b43e1365e8d1d4a6813fe8a33b6f6
Version: 47e91f56008b43e1365e8d1d4a6813fe8a33b6f6
Version: 47e91f56008b43e1365e8d1d4a6813fe8a33b6f6
Version: 47e91f56008b43e1365e8d1d4a6813fe8a33b6f6
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_3ad.c",
            "drivers/net/bonding/bond_main.c",
            "drivers/net/bonding/bond_netlink.c",
            "drivers/net/bonding/bond_procfs.c",
            "drivers/net/bonding/bond_sysfs_slave.c",
            "include/net/bond_3ad.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ba2272be04f0cb1e74e1e355ff32ef95df280731",
              "status": "affected",
              "version": "47e91f56008b43e1365e8d1d4a6813fe8a33b6f6",
              "versionType": "git"
            },
            {
              "lessThan": "3b7265b3a82f40d2357c4004b26eb794a095b186",
              "status": "affected",
              "version": "47e91f56008b43e1365e8d1d4a6813fe8a33b6f6",
              "versionType": "git"
            },
            {
              "lessThan": "5fb9ea4e8ebf514d92df2b6c9d0db25ba02ac735",
              "status": "affected",
              "version": "47e91f56008b43e1365e8d1d4a6813fe8a33b6f6",
              "versionType": "git"
            },
            {
              "lessThan": "c169c5837525ad842df6a542facf52b6f866a519",
              "status": "affected",
              "version": "47e91f56008b43e1365e8d1d4a6813fe8a33b6f6",
              "versionType": "git"
            },
            {
              "lessThan": "78f409fd34fe9de2b24ad8e9dca1b4608a48ed3d",
              "status": "affected",
              "version": "47e91f56008b43e1365e8d1d4a6813fe8a33b6f6",
              "versionType": "git"
            },
            {
              "lessThan": "c4f050ce06c56cfb5993268af4a5cb66ed1cd04e",
              "status": "affected",
              "version": "47e91f56008b43e1365e8d1d4a6813fe8a33b6f6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_3ad.c",
            "drivers/net/bonding/bond_main.c",
            "drivers/net/bonding/bond_netlink.c",
            "drivers/net/bonding/bond_procfs.c",
            "drivers/net/bonding/bond_sysfs_slave.c",
            "include/net/bond_3ad.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: 3ad: implement proper RCU rules for port-\u003eaggregator\n\nsyzbot found a data-race in bond_3ad_get_active_agg_info /\nbond_3ad_state_machine_handler [1] which hints at lack of proper\nRCU implementation.\n\nAdd __rcu qualifier to port-\u003eaggregator, and add proper RCU API.\n\n[1]\n\nBUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler\n\nwrite to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0:\n  ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline]\n  bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569\n  process_one_work kernel/workqueue.c:3302 [inline]\n  process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385\n  worker_thread+0x58a/0x780 kernel/workqueue.c:3466\n  kthread+0x22a/0x280 kernel/kthread.c:436\n  ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n\nread to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1:\n  __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline]\n  bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881\n  bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853\n  rtnl_link_info_fill net/core/rtnetlink.c:906 [inline]\n  rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927\n  rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168\n  rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453\n  rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline]\n  rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495\n  __dev_notify_flags+0x76/0x390 net/core/dev.c:9790\n  netif_change_flags+0xac/0xd0 net/core/dev.c:9823\n  do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180\n  rtnl_group_changelink net/core/rtnetlink.c:3813 [inline]\n  __rtnl_newlink net/core/rtnetlink.c:3981 [inline]\n  rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109\n  rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995\n  netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550\n  rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022\n  netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n  netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344\n  netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894\n  sock_sendmsg_nosec net/socket.c:787 [inline]\n  __sock_sendmsg net/socket.c:802 [inline]\n  ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698\n  ___sys_sendmsg+0x195/0x1e0 net/socket.c:2752\n  __sys_sendmsg net/socket.c:2784 [inline]\n  __do_sys_sendmsg net/socket.c:2789 [inline]\n  __se_sys_sendmsg net/socket.c:2787 [inline]\n  __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2787\n  x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47\n  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n  do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nvalue changed: 0x0000000000000000 -\u003e 0xffff88813cf5c400\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G        W           syzkaller #0 PREEMPT(full)\nTainted: [W]=WARN\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable paths are local bonding control/information paths such as rtnetlink, sysfs, and procfs racing with the 802.3ad workqueue. A remote packet alone is not sufficient for the complete race; a local attacker can exercise the reader and drive bond state changes.\nAC:L - A local attacker can create/configure an 802.3ad bond in a user/network namespace and repeatedly issue concurrent link queries while the bond workqueue updates port-\u003eaggregator. The race is attacker-influenced and does not depend on rare conditions outside the attacker\u0027s control.\nPR:L - Bond creation and many control operations require CAP_NET_ADMIN, but that is reachable by an unprivileged user inside a user namespace. RTM_GETLINK-style readers are even less restricted, but exploitation still assumes a local unprivileged user context.\nUI:N - No victim action is required once the attacker can run local commands or netlink requests. The attacker can trigger the relevant reader and writer activity directly.\nS:U - The impact remains within the kernel and the host networking subsystem security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is an RCU lifetime violation on port-\u003eaggregator, which points into per-slave ad_slave_info memory that can be cleared, freed, or reused. Treating the stale-pointer/UAF condition conservatively, it can expose kernel memory through groomed object reuse.\nI:H - A stale kernel pointer/UAF in attacker-controllable bonding state is a memory-safety issue that can plausibly be heap-groomed beyond a simple crash. Under the required overestimation rule, this supports high integrity impact.\nA:H - At minimum, racing dereferences of port-\u003eaggregator can lead to invalid pointer dereferences, inconsistent list traversal, oops, or panic. The vulnerability is therefore capable of causing a kernel-level denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:17.100Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ba2272be04f0cb1e74e1e355ff32ef95df280731"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b7265b3a82f40d2357c4004b26eb794a095b186"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fb9ea4e8ebf514d92df2b6c9d0db25ba02ac735"
        },
        {
          "url": "https://git.kernel.org/stable/c/c169c5837525ad842df6a542facf52b6f866a519"
        },
        {
          "url": "https://git.kernel.org/stable/c/78f409fd34fe9de2b24ad8e9dca1b4608a48ed3d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4f050ce06c56cfb5993268af4a5cb66ed1cd04e"
        }
      ],
      "title": "bonding: 3ad: implement proper RCU rules for port-\u003eaggregator",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52975",
    "datePublished": "2026-06-24T16:28:52.514Z",
    "dateReserved": "2026-06-09T07:44:35.376Z",
    "dateUpdated": "2026-08-05T12:32:17.100Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.