CVE-2025-38727 (GCVE-0-2025-38727)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:33 – Updated: 2025-11-03 17:41
VLAI?
Title
netlink: avoid infinite retry looping in netlink_unicast()
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).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9da025150b7c14a8390fc06aea314c0a4011e82c , < 47d49fd07f86d1f55ea1083287303d237e9e0922 (git)
Affected: c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 , < 6bee383ff83352a693d03efdf27cdd80742f71b2 (git)
Affected: fd69af06101090eaa60b3d216ae715f9c0a58e5b , < f324959ad47e62e3cadaffa65d3cff790fb48529 (git)
Affected: 76602d8e13864524382b0687dc32cd8f19164d5a , < d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e (git)
Affected: 55baecb9eb90238f60a8350660d6762046ebd3bd , < 346c820ef5135cf062fa3473da955ef8c5fb6929 (git)
Affected: 4b8e18af7bea92f8b7fb92d40aeae729209db250 , < 44ddd7b1ae0b7edb2c832eb16798c827a05e58f0 (git)
Affected: cd7ff61bfffd7000143c42bbffb85eeb792466d6 , < 78fcd69d55c5f11d7694c547eca767a1cfd38ec4 (git)
Affected: ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc , < e8edc7de688791a337c068693f22e8d8b869df71 (git)
Affected: ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc , < 759dfc7d04bab1b0b86113f1164dc1fec192b859 (git)
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    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "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)."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922"
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        {
          "url": "https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2"
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        },
        {
          "url": "https://git.kernel.org/stable/c/759dfc7d04bab1b0b86113f1164dc1fec192b859"
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      "title": "netlink: avoid infinite retry looping in netlink_unicast()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38727",
    "datePublished": "2025-09-04T15:33:25.286Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2025-11-03T17:41:56.297Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}


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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.



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