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CERTFR-2026-AVI-0288
Vulnerability from certfr_avis - Published: 2026-03-13 - Updated: 2026-03-13
De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Elles permettent à un attaquant de provoquer un contournement de la politique de sécurité et un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "SUSE Linux Micro 6.2",
"product": {
"name": "N/A",
"vendor": {
"name": "SUSE",
"scada": false
}
}
},
{
"description": "SUSE Linux Enterprise Server for SAP Applications 16.0",
"product": {
"name": "N/A",
"vendor": {
"name": "SUSE",
"scada": false
}
}
},
{
"description": "SUSE Linux Enterprise Server 16.0",
"product": {
"name": "N/A",
"vendor": {
"name": "SUSE",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2025-40186",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40186"
},
{
"name": "CVE-2025-39698",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-39698"
},
{
"name": "CVE-2025-40130",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40130"
},
{
"name": "CVE-2025-40129",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40129"
},
{
"name": "CVE-2025-39742",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-39742"
},
{
"name": "CVE-2025-38352",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38352"
}
],
"initial_release_date": "2026-03-13T00:00:00",
"last_revision_date": "2026-03-13T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0288",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-03-13T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans le noyau Linux de SUSE. Elles permettent \u00e0 un attaquant de provoquer un contournement de la politique de s\u00e9curit\u00e9 et un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans le noyau Linux de SUSE",
"vendor_advisories": [
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20643-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620643-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20634-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620634-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20636-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620636-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20637-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620637-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20645-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620645-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20635-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620635-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20648-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620648-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20644-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620644-1"
},
{
"published_at": "2026-03-04",
"title": "Bulletin de s\u00e9curit\u00e9 SUSE SUSE-SU-2026:20646-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-202620646-1"
}
]
}
CVE-2025-38352 (GCVE-0-2025-38352)
Vulnerability from cvelistv5 – Published: 2025-07-22 08:04 – Updated: 2026-08-05 12:01
VLAI
EPSS
VEX
Title
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
Summary
In the Linux kernel, the following vulnerability has been resolved:
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
If an exiting non-autoreaping task has already passed exit_notify() and
calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent
or debugger right after unlock_task_sighand().
If a concurrent posix_cpu_timer_del() runs at that moment, it won't be
able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or
lock_task_sighand() will fail.
Add the tsk->exit_state check into run_posix_cpu_timers() to fix this.
This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because
exit_task_work() is called before exit_notify(). But the check still
makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail
anyway in this case.
Severity
7.8 (High)
7.4 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
12 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 78a4b8e3795b31dae58762bc091bb0f4f74a2200
(git)
Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < c076635b3a42771ace7d276de8dc3bc76ee2ba1b (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 2f3daa04a9328220de46f0d5c919a6c0073a9f0b (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 764a7a5dfda23f69919441f2eac2a83e7db6e5bb (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < c29d5318708e67ac13c1b6fc1007d179fb65b4d7 (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 460188bc042a3f40f72d34b9f7fc6ee66b0b757b (git) Affected: 0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < f90fff1e152dedf52b932240ebbd670d83330eca (git) |
|
| Linux | Linux |
Affected:
2.6.36
Unaffected: 0 , < 2.6.36 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.94 , ≤ 6.6.* (semver) Unaffected: 6.12.34 , ≤ 6.12.* (semver) Unaffected: 6.15.3 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
{
"containers": {
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"metrics": [
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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}
},
{
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"timestamp": "2025-09-05T03:55:31.566379Z",
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},
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}
},
{
"other": {
"content": {
"dateAdded": "2025-09-04",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352"
},
"type": "kev"
}
}
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}
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"providerMetadata": {
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},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352"
},
{
"tags": [
"exploit"
],
"url": "https://github.com/farazsth98/chronomaly"
}
],
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2025-11-03T17:37:02.965Z",
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"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
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}
],
"title": "CVE Program Container"
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"cna": {
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{
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"versions": [
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{
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{
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"versions": [
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"version": "2.6.36"
},
{
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"status": "unaffected",
"version": "0",
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},
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{
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"status": "unaffected",
"version": "5.15.186",
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{
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"status": "unaffected",
"version": "6.6.94",
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"status": "unaffected",
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{
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"status": "unaffected",
"version": "6.15.3",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix"
}
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}
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()\n\nIf an exiting non-autoreaping task has already passed exit_notify() and\ncalls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent\nor debugger right after unlock_task_sighand().\n\nIf a concurrent posix_cpu_timer_del() runs at that moment, it won\u0027t be\nable to detect timer-\u003eit.cpu.firing != 0: cpu_timer_task_rcu() and/or\nlock_task_sighand() will fail.\n\nAdd the tsk-\u003eexit_state check into run_posix_cpu_timers() to fix this.\n\nThis fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because\nexit_task_work() is called before exit_notify(). But the check still\nmakes sense, task_work_add(\u0026tsk-\u003eposix_cputimers_work.work) will fail\nanyway in this case."
}
],
"metrics": [
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is reached purely through local syscalls \u2014 `timer_create`/`timer_settime`/`timer_delete` (or `clock_nanosleep`) plus `ptrace`/`waitpid` to control task reaping \u2014 with the trigger arriving via the local timer tick. There is no network-facing path into posix-cpu-timers.\nAC:L - The attacker controls both sides of the race: it arms the CPU timer expiry, chooses the precise moment of `release_task()` by calling `waitpid()` from its own parent/tracer, and issues the concurrent `timer_delete()` from a sibling thread \u2014 retryable in a tight loop and widenable by queueing up to 20 timers on the firing list. Real-world exploitation of this exact bug confirms it is reliably winnable.\nPR:L - No capability or permission check exists anywhere on the path \u2014 `validate_clock_permissions()`/`pid_for_clock()` gate only on thread-group/pid existence, and `grep` for `capable`/`CAP_` in both posix-timers files returns nothing. Any unprivileged local user, including a seccomp-confined Android app UID, can reach it.\nUI:N - The attacker\u0027s own processes and threads perform every step \u2014 creating the timer, exiting the traced thread, reaping it, and deleting the timer. No victim action of any kind is needed.\nS:U - The use-after-free corrupts kernel heap objects and escalates within the kernel\u0027s own security authority, which is standard kernel privilege escalation. No hypervisor, IOMMU, or other security-authority boundary is crossed.\nC:H - The freed `struct sigqueue` is linked into the signal pending list by `send_sigqueue()` and later copied out to userspace through `dequeue_signal()`/`rt_sigtimedwait()`, disclosing whatever now occupies the reclaimed slab object \u2014 an effectively arbitrary kernel-memory read. The `do_cpu_nanosleep()` variant additionally exposes reclaimed kernel stack.\nI:H - `send_sigqueue()` writes into the freed object (`q-\u003einfo.si_overrun++`) and performs a `list_add_tail()` linked-list insertion on attacker-resprayable memory, followed by a double free on dequeue \u2014 a classic controlled-write primitive leading to full privilege escalation, as demonstrated by in-the-wild exploitation of this flaw.\nA:H - Even without successful exploitation the race causes `BUG_ON(!(q-\u003eflags \u0026 SIGQUEUE_PREALLOC))` in `send_sigqueue()`, `WARN_ON_ONCE()` in the delete path, list corruption, and a double free \u2014 any of which oops or panic the kernel. Spinning the race is trivially repeatable as a denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:01:20.234Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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{
"url": "https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb"
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{
"url": "https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff"
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{
"url": "https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b"
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{
"url": "https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca"
}
],
"title": "posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()",
"x_generator": {
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}
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"cveId": "CVE-2025-38352",
"datePublished": "2025-07-22T08:04:25.277Z",
"dateReserved": "2025-04-16T04:51:24.006Z",
"dateUpdated": "2026-08-05T12:01:20.234Z",
"state": "PUBLISHED"
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CVE-2025-39698 (GCVE-0-2025-39698)
Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-08-05 12:04
VLAI
EPSS
VEX
Title
io_uring/futex: ensure io_futex_wait() cleans up properly on failure
Summary
In the Linux kernel, the following vulnerability has been resolved:
io_uring/futex: ensure io_futex_wait() cleans up properly on failure
The io_futex_data is allocated upfront and assigned to the io_kiocb
async_data field, but the request isn't marked with REQ_F_ASYNC_DATA
at that point. Those two should always go together, as the flag tells
io_uring whether the field is valid or not.
Additionally, on failure cleanup, the futex handler frees the data but
does not clear ->async_data. Clear the data and the flag in the error
path as well.
Thanks to Trend Micro Zero Day Initiative and particularly ReDress for
reporting this.
Severity
7.8 (High)
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-672 - Operation on a Resource after Expiration or Release
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
194bb58c6090e39bd7d9b9c888a079213628e1f6 , < d9f93172820a53ab42c4b0e5e65291f4f9d00ad2
(git)
Affected: 194bb58c6090e39bd7d9b9c888a079213628e1f6 , < d34c04152df517c59979b4bf2a47f491e06d3256 (git) Affected: 194bb58c6090e39bd7d9b9c888a079213628e1f6 , < 508c1314b342b78591f51c4b5dadee31a88335df (git) |
|
| Linux | Linux |
Affected:
6.7
Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.44 , ≤ 6.12.* (semver) Unaffected: 6.16.4 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
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CVE-2025-39742 (GCVE-0-2025-39742)
Vulnerability from cvelistv5 – Published: 2025-09-11 16:52 – Updated: 2026-05-12 12:06
VLAI
EPSS
VEX
Title
RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
Summary
In the Linux kernel, the following vulnerability has been resolved:
RDMA: hfi1: fix possible divide-by-zero in find_hw_thread_mask()
The function divides number of online CPUs by num_core_siblings, and
later checks the divider by zero. This implies a possibility to get
and divide-by-zero runtime error. Fix it by moving the check prior to
division. This also helps to save one indentation level.
Severity
No CVSS data available.
Assigner
References
12 references
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
b094a36f90975373c3a241839869217a65f17d81 , < 9bba1a9994c523b44db64f63b564b4719ea2b7ef
(git)
Affected: b094a36f90975373c3a241839869217a65f17d81 , < 1a7cf828ed861de5be1aff99e10f114b363c19d3 (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < 9d3211cb61a0773a2440d0a0698c1e6e7429f907 (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < 4b4317b0d758ff92ba96f4e448a8992a6fe607bf (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < 89fdac333a17ed990b41565630ef4791782e02f5 (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < 9b05e91afe948ed819bf87d7ba0fccf451ed79a6 (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < 31d0599a23efdbfe579bfbd1eb8f8c942f13744d (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < ac53f377393cc85156afdc90b636e84e544a6f96 (git) Affected: b094a36f90975373c3a241839869217a65f17d81 , < 59f7d2138591ef8f0e4e4ab5f1ab674e8181ad3a (git) |
|
| Linux | Linux |
Affected:
4.8
Unaffected: 0 , < 4.8 (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) |
|
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
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CVE-2025-40129 (GCVE-0-2025-40129)
Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-08-05 12:07
VLAI
EPSS
VEX
Title
sunrpc: fix null pointer dereference on zero-length checksum
Summary
In the Linux kernel, the following vulnerability has been resolved:
sunrpc: fix null pointer dereference on zero-length checksum
In xdr_stream_decode_opaque_auth(), zero-length checksum.len causes
checksum.data to be set to NULL. This triggers a NPD when accessing
checksum.data in gss_krb5_verify_mic_v2(). This patch ensures that
the value of checksum.len is not less than XDR_UNIT.
Severity
7.5 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
0653028e8f1c97fec30710813a001ad8a2ec34f4 , < 81cec07d303186d0d8c623ef8b5ecd3b81e94cf6
(git)
Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < affc03d44921f493deaae1d33151e3067a6f9f8f (git) Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < ab9a70cd2386a0d70c164b0905dd66bc9af52e77 (git) Affected: 0653028e8f1c97fec30710813a001ad8a2ec34f4 , < 6df164e29bd4e6505c5a2e0e5f1e1f6957a16a42 (git) |
|
| Linux | Linux |
Affected:
6.3
Unaffected: 0 , < 6.3 (semver) Unaffected: 6.6.112 , ≤ 6.6.* (semver) Unaffected: 6.12.53 , ≤ 6.12.* (semver) Unaffected: 6.17.3 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
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CVE-2025-40130 (GCVE-0-2025-40130)
Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-05-11 21:43
VLAI
EPSS
VEX
Title
scsi: ufs: core: Fix data race in CPU latency PM QoS request handling
Summary
In the Linux kernel, the following vulnerability has been resolved:
scsi: ufs: core: Fix data race in CPU latency PM QoS request handling
The cpu_latency_qos_add/remove/update_request interfaces lack internal
synchronization by design, requiring the caller to ensure thread safety.
The current implementation relies on the 'pm_qos_enabled' flag, which is
insufficient to prevent concurrent access and cannot serve as a proper
synchronization mechanism. This has led to data races and list
corruption issues.
A typical race condition call trace is:
[Thread A]
ufshcd_pm_qos_exit()
--> cpu_latency_qos_remove_request()
--> cpu_latency_qos_apply();
--> pm_qos_update_target()
--> plist_del <--(1) delete plist node
--> memset(req, 0, sizeof(*req));
--> hba->pm_qos_enabled = false;
[Thread B]
ufshcd_devfreq_target
--> ufshcd_devfreq_scale
--> ufshcd_scale_clks
--> ufshcd_pm_qos_update <--(2) pm_qos_enabled is true
--> cpu_latency_qos_update_request
--> pm_qos_update_target
--> plist_del <--(3) plist node use-after-free
Introduces a dedicated mutex to serialize PM QoS operations, preventing
data races and ensuring safe access to PM QoS resources, including sysfs
interface reads.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
2777e73fc154e2e87233bdcc0e2402b33815198e , < d9df61afb8d23c475f1be3c714da2c34c156ab01
(git)
Affected: 2777e73fc154e2e87233bdcc0e2402b33815198e , < 79dde5f7dc7c038eec903745dc1550cd4139980e (git) |
|
| Linux | Linux |
Affected:
6.9
Unaffected: 0 , < 6.9 (semver) Unaffected: 6.17.3 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
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CVE-2025-40186 (GCVE-0-2025-40186)
Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2026-08-05 12:08
VLAI
EPSS
VEX
Title
tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
Summary
In the Linux kernel, the following vulnerability has been resolved:
tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
syzbot reported the splat below in tcp_conn_request(). [0]
If a listener is close()d while a TFO socket is being processed in
tcp_conn_request(), inet_csk_reqsk_queue_add() does not set reqsk->sk
and calls inet_child_forget(), which calls tcp_disconnect() for the
TFO socket.
After the cited commit, tcp_disconnect() calls reqsk_fastopen_remove(),
where reqsk_put() is called due to !reqsk->sk.
Then, reqsk_fastopen_remove() in tcp_conn_request() decrements the
last req->rsk_refcnt and frees reqsk, and __reqsk_free() at the
drop_and_free label causes the refcount underflow for the listener
and double-free of the reqsk.
Let's remove reqsk_fastopen_remove() in tcp_conn_request().
Note that other callers make sure tp->fastopen_rsk is not NULL.
[0]:
refcount_t: underflow; use-after-free.
WARNING: CPU: 12 PID: 5563 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28)
Modules linked in:
CPU: 12 UID: 0 PID: 5563 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:refcount_warn_saturate (lib/refcount.c:28)
Code: ab e8 8e b4 98 ff 0f 0b c3 cc cc cc cc cc 80 3d a4 e4 d6 01 00 75 9c c6 05 9b e4 d6 01 01 48 c7 c7 e8 df fb ab e8 6a b4 98 ff <0f> 0b e9 03 5b 76 00 cc 80 3d 7d e4 d6 01 00 0f 85 74 ff ff ff c6
RSP: 0018:ffffa79fc0304a98 EFLAGS: 00010246
RAX: d83af4db1c6b3900 RBX: ffff9f65c7a69020 RCX: d83af4db1c6b3900
RDX: 0000000000000000 RSI: 00000000ffff7fff RDI: ffffffffac78a280
RBP: 000000009d781b60 R08: 0000000000007fff R09: ffffffffac6ca280
R10: 0000000000017ffd R11: 0000000000000004 R12: ffff9f65c7b4f100
R13: ffff9f65c7d23c00 R14: ffff9f65c7d26000 R15: ffff9f65c7a64ef8
FS: 00007f9f962176c0(0000) GS:ffff9f65fcf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000180 CR3: 000000000dbbe006 CR4: 0000000000372ef0
Call Trace:
<IRQ>
tcp_conn_request (./include/linux/refcount.h:400 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/sock.h:1965 ./include/net/request_sock.h:131 net/ipv4/tcp_input.c:7301)
tcp_rcv_state_process (net/ipv4/tcp_input.c:6708)
tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1670)
tcp_v6_rcv (net/ipv6/tcp_ipv6.c:1906)
ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438)
ip6_input (net/ipv6/ip6_input.c:500)
ipv6_rcv (net/ipv6/ip6_input.c:311)
__netif_receive_skb (net/core/dev.c:6104)
process_backlog (net/core/dev.c:6456)
__napi_poll (net/core/dev.c:7506)
net_rx_action (net/core/dev.c:7569 net/core/dev.c:7696)
handle_softirqs (kernel/softirq.c:579)
do_softirq (kernel/softirq.c:480)
</IRQ>
Severity
8.1 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
7ec092a91ff351dcde89c23e795b73a328274db6 , < e359b742eac1eac75cff4e38ee2e8cea492acd9b
(git)
Affected: a4378dedd6e07e62f2fccb17d78c9665718763d0 , < ff6a8883f96a5bc74241ce5b3d431a6dcfa2124d (git) Affected: 33a4fdf0b4a25f8ce65380c3b0136b407ca57609 , < eb85ad5f23268d64b037bfb545cbcba3752f90c7 (git) Affected: 17d699727577814198d744d6afe54735c6b54c99 , < 643a94b0cf767325e953591c212be2eb826b9d7f (git) Affected: dfd06131107e7b699ef1e2a24ed2f7d17c917753 , < 422c1c173c39bbbae1e0eaaf8aefe40b2596233b (git) Affected: fa4749c065644af4db496b338452a69a3e5147d9 , < c11ace909e873118295e9eb22dc8c58b0b50eb32 (git) Affected: 45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01 , < 64dc47a13aa3d9daf7cec29b44dca8e22a6aea15 (git) Affected: 45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01 , < 2e7cbbbe3d61c63606994b7ff73c72537afe2e1c (git) Affected: ae313d14b45eca7a6bb29cb9bf396d977e7d28fb (git) Affected: 5.4.300 , < 5.4.301 (semver) Affected: 5.10.245 , < 5.10.246 (semver) Affected: 5.15.194 , < 5.15.195 (semver) Affected: 6.1.154 , < 6.1.157 (semver) Affected: 6.6.108 , < 6.6.113 (semver) Affected: 6.12.49 , < 6.12.54 (semver) Affected: 6.16.9 , < 6.17 (semver) |
|
| Linux | Linux |
Affected:
6.17
Unaffected: 0 , < 6.17 (semver) Unaffected: 5.4.301 , ≤ 5.4.* (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.195 , ≤ 5.15.* (semver) Unaffected: 6.1.157 , ≤ 6.1.* (semver) Unaffected: 6.6.113 , ≤ 6.6.* (semver) Unaffected: 6.12.54 , ≤ 6.12.* (semver) Unaffected: 6.17.4 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
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"versionType": "git"
},
{
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"status": "affected",
"version": "a4378dedd6e07e62f2fccb17d78c9665718763d0",
"versionType": "git"
},
{
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"status": "affected",
"version": "33a4fdf0b4a25f8ce65380c3b0136b407ca57609",
"versionType": "git"
},
{
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"status": "affected",
"version": "17d699727577814198d744d6afe54735c6b54c99",
"versionType": "git"
},
{
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"status": "affected",
"version": "dfd06131107e7b699ef1e2a24ed2f7d17c917753",
"versionType": "git"
},
{
"lessThan": "c11ace909e873118295e9eb22dc8c58b0b50eb32",
"status": "affected",
"version": "fa4749c065644af4db496b338452a69a3e5147d9",
"versionType": "git"
},
{
"lessThan": "64dc47a13aa3d9daf7cec29b44dca8e22a6aea15",
"status": "affected",
"version": "45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01",
"versionType": "git"
},
{
"lessThan": "2e7cbbbe3d61c63606994b7ff73c72537afe2e1c",
"status": "affected",
"version": "45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01",
"versionType": "git"
},
{
"status": "affected",
"version": "ae313d14b45eca7a6bb29cb9bf396d977e7d28fb",
"versionType": "git"
},
{
"lessThan": "5.4.301",
"status": "affected",
"version": "5.4.300",
"versionType": "semver"
},
{
"lessThan": "5.10.246",
"status": "affected",
"version": "5.10.245",
"versionType": "semver"
},
{
"lessThan": "5.15.195",
"status": "affected",
"version": "5.15.194",
"versionType": "semver"
},
{
"lessThan": "6.1.157",
"status": "affected",
"version": "6.1.154",
"versionType": "semver"
},
{
"lessThan": "6.6.113",
"status": "affected",
"version": "6.6.108",
"versionType": "semver"
},
{
"lessThan": "6.12.54",
"status": "affected",
"version": "6.12.49",
"versionType": "semver"
},
{
"lessThan": "6.17",
"status": "affected",
"version": "6.16.9",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv4/tcp_input.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"lessThan": "6.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.301",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.195",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.113",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.54",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.301",
"versionStartIncluding": "5.4.300",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.246",
"versionStartIncluding": "5.10.245",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.195",
"versionStartIncluding": "5.15.194",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.157",
"versionStartIncluding": "6.1.154",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.113",
"versionStartIncluding": "6.6.108",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.54",
"versionStartIncluding": "6.12.49",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.4",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "6.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.16.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Don\u0027t call reqsk_fastopen_remove() in tcp_conn_request().\n\nsyzbot reported the splat below in tcp_conn_request(). [0]\n\nIf a listener is close()d while a TFO socket is being processed in\ntcp_conn_request(), inet_csk_reqsk_queue_add() does not set reqsk-\u003esk\nand calls inet_child_forget(), which calls tcp_disconnect() for the\nTFO socket.\n\nAfter the cited commit, tcp_disconnect() calls reqsk_fastopen_remove(),\nwhere reqsk_put() is called due to !reqsk-\u003esk.\n\nThen, reqsk_fastopen_remove() in tcp_conn_request() decrements the\nlast req-\u003ersk_refcnt and frees reqsk, and __reqsk_free() at the\ndrop_and_free label causes the refcount underflow for the listener\nand double-free of the reqsk.\n\nLet\u0027s remove reqsk_fastopen_remove() in tcp_conn_request().\n\nNote that other callers make sure tp-\u003efastopen_rsk is not NULL.\n\n[0]:\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 12 PID: 5563 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28)\nModules linked in:\nCPU: 12 UID: 0 PID: 5563 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025\nRIP: 0010:refcount_warn_saturate (lib/refcount.c:28)\nCode: ab e8 8e b4 98 ff 0f 0b c3 cc cc cc cc cc 80 3d a4 e4 d6 01 00 75 9c c6 05 9b e4 d6 01 01 48 c7 c7 e8 df fb ab e8 6a b4 98 ff \u003c0f\u003e 0b e9 03 5b 76 00 cc 80 3d 7d e4 d6 01 00 0f 85 74 ff ff ff c6\nRSP: 0018:ffffa79fc0304a98 EFLAGS: 00010246\nRAX: d83af4db1c6b3900 RBX: ffff9f65c7a69020 RCX: d83af4db1c6b3900\nRDX: 0000000000000000 RSI: 00000000ffff7fff RDI: ffffffffac78a280\nRBP: 000000009d781b60 R08: 0000000000007fff R09: ffffffffac6ca280\nR10: 0000000000017ffd R11: 0000000000000004 R12: ffff9f65c7b4f100\nR13: ffff9f65c7d23c00 R14: ffff9f65c7d26000 R15: ffff9f65c7a64ef8\nFS: 00007f9f962176c0(0000) GS:ffff9f65fcf00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000200000000180 CR3: 000000000dbbe006 CR4: 0000000000372ef0\nCall Trace:\n \u003cIRQ\u003e\n tcp_conn_request (./include/linux/refcount.h:400 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/sock.h:1965 ./include/net/request_sock.h:131 net/ipv4/tcp_input.c:7301)\n tcp_rcv_state_process (net/ipv4/tcp_input.c:6708)\n tcp_v6_do_rcv (net/ipv6/tcp_ipv6.c:1670)\n tcp_v6_rcv (net/ipv6/tcp_ipv6.c:1906)\n ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:438)\n ip6_input (net/ipv6/ip6_input.c:500)\n ipv6_rcv (net/ipv6/ip6_input.c:311)\n __netif_receive_skb (net/core/dev.c:6104)\n process_backlog (net/core/dev.c:6456)\n __napi_poll (net/core/dev.c:7506)\n net_rx_action (net/core/dev.c:7569 net/core/dev.c:7696)\n handle_softirqs (kernel/softirq.c:579)\n do_softirq (kernel/softirq.c:480)\n \u003c/IRQ\u003e"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable code is in the TCP/IP stack\u0027s inbound SYN-processing path (tcp_v6_rcv \u2192 tcp_rcv_state_process \u2192 tcp_conn_request), triggered by a received TCP Fast Open SYN packet from a remote peer.\nAC:H - Triggering requires the listener socket to transition out of TCP_LISTEN (a local close()/shutdown()) at the exact moment an inbound TFO SYN is being processed; a remote attacker cannot control the timing of that close, so success depends on conditions beyond their control.\nPR:N - The TFO SYN is processed pre-connection with no authentication; an unauthenticated remote attacker needs no privileges to reach tcp_conn_request().\nUI:N - The bug is triggered purely by network packet processing racing with a listener close; no victim interaction is required.\nS:U - The corruption stays within the kernel\u0027s own memory/security authority (request_sock slab and listener refcount); no VM/IOMMU/sandbox boundary is crossed.\nC:H - The refcount underflow yields a use-after-free/double-free of a request_sock, giving an attacker control over freed-object contents that can be leveraged to read adjacent kernel memory.\nI:H - The double-free/UAF is a heap-corruption primitive that can be groomed into an arbitrary-write / control-flow-hijack, so integrity impact is high.\nA:H - The refcount underflow and double-free reliably corrupt kernel memory and crash the kernel (oops/panic in softirq context), a high availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:08:24.563Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e359b742eac1eac75cff4e38ee2e8cea492acd9b"
},
{
"url": "https://git.kernel.org/stable/c/ff6a8883f96a5bc74241ce5b3d431a6dcfa2124d"
},
{
"url": "https://git.kernel.org/stable/c/eb85ad5f23268d64b037bfb545cbcba3752f90c7"
},
{
"url": "https://git.kernel.org/stable/c/643a94b0cf767325e953591c212be2eb826b9d7f"
},
{
"url": "https://git.kernel.org/stable/c/422c1c173c39bbbae1e0eaaf8aefe40b2596233b"
},
{
"url": "https://git.kernel.org/stable/c/c11ace909e873118295e9eb22dc8c58b0b50eb32"
},
{
"url": "https://git.kernel.org/stable/c/64dc47a13aa3d9daf7cec29b44dca8e22a6aea15"
},
{
"url": "https://git.kernel.org/stable/c/2e7cbbbe3d61c63606994b7ff73c72537afe2e1c"
}
],
"title": "tcp: Don\u0027t call reqsk_fastopen_remove() in tcp_conn_request().",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40186",
"datePublished": "2025-11-12T21:56:29.033Z",
"dateReserved": "2025-04-16T07:20:57.177Z",
"dateUpdated": "2026-08-05T12:08:24.563Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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.
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