CVE-2025-38727 (GCVE-0-2025-38727)
Vulnerability from cvelistv5
Published
2025-09-04 15:33
Modified
2025-09-04 15:33
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netlink: avoid infinite retry looping in netlink_unicast() netlink_attachskb() checks for the socket's read memory allocation constraints. Firstly, it has: rmem < READ_ONCE(sk->sk_rcvbuf) to check if the just increased rmem value fits into the socket's receive buffer. If not, it proceeds and tries to wait for the memory under: rmem + skb->truesize > READ_ONCE(sk->sk_rcvbuf) The checks don't cover the case when skb->truesize + sk->sk_rmem_alloc is equal to sk->sk_rcvbuf. Thus the function neither successfully accepts these conditions, nor manages to reschedule the task - and is called in retry loop for indefinite time which is caught as: rcu: INFO: rcu_sched self-detected stall on CPU rcu: 0-....: (25999 ticks this GP) idle=ef2/1/0x4000000000000000 softirq=262269/262269 fqs=6212 (t=26000 jiffies g=230833 q=259957) NMI backtrace for cpu 0 CPU: 0 PID: 22 Comm: kauditd Not tainted 5.10.240 #68 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc42 04/01/2014 Call Trace: <IRQ> dump_stack lib/dump_stack.c:120 nmi_cpu_backtrace.cold lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace lib/nmi_backtrace.c:62 rcu_dump_cpu_stacks kernel/rcu/tree_stall.h:335 rcu_sched_clock_irq.cold kernel/rcu/tree.c:2590 update_process_times kernel/time/timer.c:1953 tick_sched_handle kernel/time/tick-sched.c:227 tick_sched_timer kernel/time/tick-sched.c:1399 __hrtimer_run_queues kernel/time/hrtimer.c:1652 hrtimer_interrupt kernel/time/hrtimer.c:1717 __sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 asm_call_irq_on_stack arch/x86/entry/entry_64.S:808 </IRQ> netlink_attachskb net/netlink/af_netlink.c:1234 netlink_unicast net/netlink/af_netlink.c:1349 kauditd_send_queue kernel/audit.c:776 kauditd_thread kernel/audit.c:897 kthread kernel/kthread.c:328 ret_from_fork arch/x86/entry/entry_64.S:304 Restore the original behavior of the check which commit in Fixes accidentally missed when restructuring the code. Found by Linux Verification Center (linuxtesting.org).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/346c820ef5135cf062fa3473da955ef8c5fb6929
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44ddd7b1ae0b7edb2c832eb16798c827a05e58f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/759dfc7d04bab1b0b86113f1164dc1fec192b859
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78fcd69d55c5f11d7694c547eca767a1cfd38ec4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8edc7de688791a337c068693f22e8d8b869df71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f324959ad47e62e3cadaffa65d3cff790fb48529
Impacted products
Vendor Product Version
Linux Linux Version: 9da025150b7c14a8390fc06aea314c0a4011e82c
Version: c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98
Version: fd69af06101090eaa60b3d216ae715f9c0a58e5b
Version: 76602d8e13864524382b0687dc32cd8f19164d5a
Version: 55baecb9eb90238f60a8350660d6762046ebd3bd
Version: 4b8e18af7bea92f8b7fb92d40aeae729209db250
Version: cd7ff61bfffd7000143c42bbffb85eeb792466d6
Version: ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc
Version: ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc
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   Linux Linux Version: 6.16
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{
  "containers": {
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          "vendor": "Linux",
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              "version": "6.16.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "5.4.296",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "5.10.241",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: avoid infinite retry looping in netlink_unicast()\n\nnetlink_attachskb() checks for the socket\u0027s read memory allocation\nconstraints. Firstly, it has:\n\n  rmem \u003c READ_ONCE(sk-\u003esk_rcvbuf)\n\nto check if the just increased rmem value fits into the socket\u0027s receive\nbuffer. If not, it proceeds and tries to wait for the memory under:\n\n  rmem + skb-\u003etruesize \u003e READ_ONCE(sk-\u003esk_rcvbuf)\n\nThe checks don\u0027t cover the case when skb-\u003etruesize + sk-\u003esk_rmem_alloc is\nequal to sk-\u003esk_rcvbuf. Thus the function neither successfully accepts\nthese conditions, nor manages to reschedule the task - and is called in\nretry loop for indefinite time which is caught as:\n\n  rcu: INFO: rcu_sched self-detected stall on CPU\n  rcu:     0-....: (25999 ticks this GP) idle=ef2/1/0x4000000000000000 softirq=262269/262269 fqs=6212\n  (t=26000 jiffies g=230833 q=259957)\n  NMI backtrace for cpu 0\n  CPU: 0 PID: 22 Comm: kauditd Not tainted 5.10.240 #68\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc42 04/01/2014\n  Call Trace:\n  \u003cIRQ\u003e\n  dump_stack lib/dump_stack.c:120\n  nmi_cpu_backtrace.cold lib/nmi_backtrace.c:105\n  nmi_trigger_cpumask_backtrace lib/nmi_backtrace.c:62\n  rcu_dump_cpu_stacks kernel/rcu/tree_stall.h:335\n  rcu_sched_clock_irq.cold kernel/rcu/tree.c:2590\n  update_process_times kernel/time/timer.c:1953\n  tick_sched_handle kernel/time/tick-sched.c:227\n  tick_sched_timer kernel/time/tick-sched.c:1399\n  __hrtimer_run_queues kernel/time/hrtimer.c:1652\n  hrtimer_interrupt kernel/time/hrtimer.c:1717\n  __sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113\n  asm_call_irq_on_stack arch/x86/entry/entry_64.S:808\n  \u003c/IRQ\u003e\n\n  netlink_attachskb net/netlink/af_netlink.c:1234\n  netlink_unicast net/netlink/af_netlink.c:1349\n  kauditd_send_queue kernel/audit.c:776\n  kauditd_thread kernel/audit.c:897\n  kthread kernel/kthread.c:328\n  ret_from_fork arch/x86/entry/entry_64.S:304\n\nRestore the original behavior of the check which commit in Fixes\naccidentally missed when restructuring the code.\n\nFound by Linux Verification Center (linuxtesting.org)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-04T15:33:25.286Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922"
        },
        {
          "url": "https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2"
        },
        {
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        },
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          "url": "https://git.kernel.org/stable/c/d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e"
        },
        {
          "url": "https://git.kernel.org/stable/c/346c820ef5135cf062fa3473da955ef8c5fb6929"
        },
        {
          "url": "https://git.kernel.org/stable/c/44ddd7b1ae0b7edb2c832eb16798c827a05e58f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/78fcd69d55c5f11d7694c547eca767a1cfd38ec4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8edc7de688791a337c068693f22e8d8b869df71"
        },
        {
          "url": "https://git.kernel.org/stable/c/759dfc7d04bab1b0b86113f1164dc1fec192b859"
        }
      ],
      "title": "netlink: avoid infinite retry looping in netlink_unicast()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38727",
    "datePublished": "2025-09-04T15:33:25.286Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-09-04T15:33:25.286Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38727\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-04T16:15:42.713\",\"lastModified\":\"2025-09-05T17:47:24.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetlink: avoid infinite retry looping in netlink_unicast()\\n\\nnetlink_attachskb() checks for the socket\u0027s read memory allocation\\nconstraints. Firstly, it has:\\n\\n  rmem \u003c READ_ONCE(sk-\u003esk_rcvbuf)\\n\\nto check if the just increased rmem value fits into the socket\u0027s receive\\nbuffer. If not, it proceeds and tries to wait for the memory under:\\n\\n  rmem + skb-\u003etruesize \u003e READ_ONCE(sk-\u003esk_rcvbuf)\\n\\nThe checks don\u0027t cover the case when skb-\u003etruesize + sk-\u003esk_rmem_alloc is\\nequal to sk-\u003esk_rcvbuf. Thus the function neither successfully accepts\\nthese conditions, nor manages to reschedule the task - and is called in\\nretry loop for indefinite time which is caught as:\\n\\n  rcu: INFO: rcu_sched self-detected stall on CPU\\n  rcu:     0-....: (25999 ticks this GP) idle=ef2/1/0x4000000000000000 softirq=262269/262269 fqs=6212\\n  (t=26000 jiffies g=230833 q=259957)\\n  NMI backtrace for cpu 0\\n  CPU: 0 PID: 22 Comm: kauditd Not tainted 5.10.240 #68\\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-4.fc42 04/01/2014\\n  Call Trace:\\n  \u003cIRQ\u003e\\n  dump_stack lib/dump_stack.c:120\\n  nmi_cpu_backtrace.cold lib/nmi_backtrace.c:105\\n  nmi_trigger_cpumask_backtrace lib/nmi_backtrace.c:62\\n  rcu_dump_cpu_stacks kernel/rcu/tree_stall.h:335\\n  rcu_sched_clock_irq.cold kernel/rcu/tree.c:2590\\n  update_process_times kernel/time/timer.c:1953\\n  tick_sched_handle kernel/time/tick-sched.c:227\\n  tick_sched_timer kernel/time/tick-sched.c:1399\\n  __hrtimer_run_queues kernel/time/hrtimer.c:1652\\n  hrtimer_interrupt kernel/time/hrtimer.c:1717\\n  __sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113\\n  asm_call_irq_on_stack arch/x86/entry/entry_64.S:808\\n  \u003c/IRQ\u003e\\n\\n  netlink_attachskb net/netlink/af_netlink.c:1234\\n  netlink_unicast net/netlink/af_netlink.c:1349\\n  kauditd_send_queue kernel/audit.c:776\\n  kauditd_thread kernel/audit.c:897\\n  kthread kernel/kthread.c:328\\n  ret_from_fork arch/x86/entry/entry_64.S:304\\n\\nRestore the original behavior of the check which commit in Fixes\\naccidentally missed when restructuring the code.\\n\\nFound by Linux Verification Center (linuxtesting.org).\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/346c820ef5135cf062fa3473da955ef8c5fb6929\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44ddd7b1ae0b7edb2c832eb16798c827a05e58f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/759dfc7d04bab1b0b86113f1164dc1fec192b859\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78fcd69d55c5f11d7694c547eca767a1cfd38ec4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8edc7de688791a337c068693f22e8d8b869df71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f324959ad47e62e3cadaffa65d3cff790fb48529\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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