CVE-2025-38727

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-09-05. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

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: 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

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).

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
5.0%
KEV
Not listed

Published

September 4, 2025

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated Jul 19, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4327-1] linux security update

https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f324959ad47e62e3cadaffa65d3cff790fb48529
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e8edc7de688791a337c068693f22e8d8b869df71
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d42b71a34f6b8a2d5c53df81169b03b8d8b5cf4e
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/78fcd69d55c5f11d7694c547eca767a1cfd38ec4
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/759dfc7d04bab1b0b86113f1164dc1fec192b859
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6bee383ff83352a693d03efdf27cdd80742f71b2
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/44ddd7b1ae0b7edb2c832eb16798c827a05e58f0
generic

netlink: avoid infinite retry looping in netlink_unicast() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/346c820ef5135cf062fa3473da955ef8c5fb6929

Vendor Advisories for CVE-2025-38727(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-intel-iotg-5.15 (5.15.0.1090.90) @ jammy2026-05-21ubuntu
ubuntulinux-tools-aws-edge (5.15.0.1095.102~20.04.1) @ focal2026-05-21ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1098.96) @ jammy2026-05-21ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1059 (5.15.0-1059.63) @ jammy2026-05-21ubuntu
ubuntulinux-tools-realtime-5.15 (5.15.0.1094.98) @ jammy2026-05-21ubuntu
ubuntulinux-tools-kvm-5.15 (5.15.0.1089.85) @ jammy2026-05-21ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1089.87) @ jammy2026-05-21ubuntu
linuxKernel @ 5.4.297—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(7)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 124 total refreshes for this CVE.

  1. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-23 02:55 UTCEG score recompute
  3. 2026-07-22 14:07 UTCEPSS rescore
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  16. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  17. 2026-07-14 13:11 UTCMITRE cvelistV5
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Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-38727?
CVE-2025-38727 is a medium vulnerability published on September 4, 2025. 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 < READONCE(sk->skrcvbuf) to check if the just increased rmem value…
When was CVE-2025-38727 disclosed?
CVE-2025-38727 was first published in the National Vulnerability Database on September 4, 2025, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-38727 actively exploited?
CVE-2025-38727 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-38727?
CVE-2025-38727 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-38727?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-38727, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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