{"id":"CVE-2025-38727","title":"netlink: avoid infinite retry looping in netlink_unicast()","summary":"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's read memory allocation\nconstraints. Firstly, it has:\n\n  rmem < R…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 9da025150b7c14a8390fc06aea314c0a4011e82c < 47d49fd07f86d1f55ea1083287303d237e9e0922","Linux >= c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 < 6bee383ff83352a693d03efdf27cdd80742f71b2","Linux >= fd69af06101090eaa60b3d216ae715f9c0a58e5b < f324959ad47e62e3cadaffa65d3cff790fb48529","Linux >= 76602d8e13864524382b0687dc32cd8f19164d5a < d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e","Linux >= 55baecb9eb90238f60a8350660d6762046ebd3bd < 346c820ef5135cf062fa3473da955ef8c5fb6929","Linux >= 4b8e18af7bea92f8b7fb92d40aeae729209db250 < 44ddd7b1ae0b7edb2c832eb16798c827a05e58f0","Linux >= cd7ff61bfffd7000143c42bbffb85eeb792466d6 < 78fcd69d55c5f11d7694c547eca767a1cfd38ec4","Linux >= ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc < e8edc7de688791a337c068693f22e8d8b869df71","Linux >= ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc < 759dfc7d04bab1b0b86113f1164dc1fec192b859","Linux >= 5.4.296 < 5.4.297","Linux >= 5.10.240 < 5.10.241","Linux >= 5.15.189 < 5.15.190","Linux >= 6.1.146 < 6.1.149","Linux >= 6.6.99 < 6.6.103","Linux >= 6.12.39 < 6.12.43","Linux >= 6.15.7 < 6.15.11","Linux 6.16"],"published":"2025-09-04","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:42:01.494Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38727","references":[{"url":"https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922"},{"url":"https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2"},{"url":"https://git.kernel.org/stable/c/f324959ad47e62e3cadaffa65d3cff790fb48529"},{"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"}],"tags":["cve.org"],"epss":0.00165,"epssPercentile":0.06214,"ingestedAt":"2026-09-08T15:33:26.997Z","slug":"CVE-2025-38727","body":"## Overview\n\nIn 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's read memory allocation\nconstraints. Firstly, it has:\n\n  rmem < READ_ONCE(sk->sk_rcvbuf)\n\nto check if the just increased rmem value fits into the socket's receive\nbuffer. If not, it proceeds and tries to wait for the memory under:\n\n  rmem + skb->truesize > READ_ONCE(sk->sk_rcvbuf)\n\nThe checks don't cover the case when skb->truesize + sk->sk_rmem_alloc is\nequal to sk->sk_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  <IRQ>\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  </IRQ>\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).\n\n## Affected\n\n- `Linux >= 9da025150b7c14a8390fc06aea314c0a4011e82c < 47d49fd07f86d1f55ea1083287303d237e9e0922`\n- `Linux >= c4ceaac5c5ba0b992ee1dc88e2a02421549e5c98 < 6bee383ff83352a693d03efdf27cdd80742f71b2`\n- `Linux >= fd69af06101090eaa60b3d216ae715f9c0a58e5b < f324959ad47e62e3cadaffa65d3cff790fb48529`\n- `Linux >= 76602d8e13864524382b0687dc32cd8f19164d5a < d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e`\n- `Linux >= 55baecb9eb90238f60a8350660d6762046ebd3bd < 346c820ef5135cf062fa3473da955ef8c5fb6929`\n- `Linux >= 4b8e18af7bea92f8b7fb92d40aeae729209db250 < 44ddd7b1ae0b7edb2c832eb16798c827a05e58f0`\n- `Linux >= cd7ff61bfffd7000143c42bbffb85eeb792466d6 < 78fcd69d55c5f11d7694c547eca767a1cfd38ec4`\n- `Linux >= ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc < e8edc7de688791a337c068693f22e8d8b869df71`\n- `Linux >= ae8f160e7eb24240a2a79fc4c815c6a0d4ee16cc < 759dfc7d04bab1b0b86113f1164dc1fec192b859`\n- `Linux >= 5.4.296 < 5.4.297`\n- `Linux >= 5.10.240 < 5.10.241`\n- `Linux >= 5.15.189 < 5.15.190`\n- `Linux >= 6.1.146 < 6.1.149`\n- `Linux >= 6.6.99 < 6.6.103`\n- `Linux >= 6.12.39 < 6.12.43`\n- `Linux >= 6.15.7 < 6.15.11`\n- `Linux 6.16`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}