{"cve":"CVE-2025-38727","nvd":{"published":"2025-09-04T16:15:42.713","modified":"2026-10-19T21:10:00.160","status":"Modified","description":"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 < 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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-835"],"references":["https://git.kernel.org/stable/c/346c820ef5135cf062fa3473da955ef8c5fb6929","https://git.kernel.org/stable/c/44ddd7b1ae0b7edb2c832eb16798c827a05e58f0","https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922","https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2","https://git.kernel.org/stable/c/759dfc7d04bab1b0b86113f1164dc1fec192b859"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2025-38727","score":0.00171,"percentile":0.06415,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}