FKIE_CVE-2025-38727
Vulnerability from fkie_nvd - Published: 2025-09-04 16:15 - Updated: 2026-07-14 13:17
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
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.4.296 | |
| linux | linux_kernel | 5.10.240 | |
| linux | linux_kernel | 5.15.189 | |
| linux | linux_kernel | 6.16 | |
| linux | linux_kernel | 6.16 | |
| linux | linux_kernel | 6.16 | |
| debian | debian_linux | 11.0 |
{
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{
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{
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},
{
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}
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],
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},
{
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{
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"product": "SIMATIC CN 4100",
"vendor": "Siemens",
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{
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"status": "affected",
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]
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{
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{
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{
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},
{
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{
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"vendor": "Siemens",
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}
]
},
{
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"vendor": "Siemens",
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{
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}
]
},
{
"defaultStatus": "unknown",
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"vendor": "Siemens",
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}
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},
{
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"vendor": "Siemens",
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"status": "affected",
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"versionType": "custom"
}
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},
{
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"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
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{
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"status": "affected",
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"versionType": "custom"
}
]
},
{
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"vendor": "Siemens",
"versions": [
{
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"status": "affected",
"version": "V3.1.6",
"versionType": "custom"
}
]
}
],
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
}
],
"configurations": [
{
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"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)."
}
],
"id": "CVE-2025-38727",
"lastModified": "2026-07-14T13:17:46.373",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-09-04T16:15:42.713",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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],
"url": "https://git.kernel.org/stable/c/346c820ef5135cf062fa3473da955ef8c5fb6929"
},
{
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},
{
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"url": "https://git.kernel.org/stable/c/47d49fd07f86d1f55ea1083287303d237e9e0922"
},
{
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],
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},
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},
{
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"url": "https://git.kernel.org/stable/c/78fcd69d55c5f11d7694c547eca767a1cfd38ec4"
},
{
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},
{
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"tags": [
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],
"url": "https://git.kernel.org/stable/c/e8edc7de688791a337c068693f22e8d8b869df71"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f324959ad47e62e3cadaffa65d3cff790fb48529"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
},
{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-835"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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