CVE-2025-39955 (GCVE-0-2025-39955)
Vulnerability from cvelistv5 – Published: 2025-10-09 09:47 – Updated: 2026-09-08 08:42
VLAI
EPSS
VEX
Title
tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().
Summary
In the Linux kernel, the following vulnerability has been resolved:
tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect().
syzbot reported the splat below where a socket had tcp_sk(sk)->fastopen_rsk
in the TCP_ESTABLISHED state. [0]
syzbot reused the server-side TCP Fast Open socket as a new client before
the TFO socket completes 3WHS:
1. accept()
2. connect(AF_UNSPEC)
3. connect() to another destination
As of accept(), sk->sk_state is TCP_SYN_RECV, and tcp_disconnect() changes
it to TCP_CLOSE and makes connect() possible, which restarts timers.
Since tcp_disconnect() forgot to clear tcp_sk(sk)->fastopen_rsk, the
retransmit timer triggered the warning and the intended packet was not
retransmitted.
Let's call reqsk_fastopen_remove() in tcp_disconnect().
[0]:
WARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))
Modules linked in:
CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))
Code: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 <0f> 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e
RSP: 0018:ffffc900002f8d40 EFLAGS: 00010293
RAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017
RDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400
RBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8
R10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540
R13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0
FS: 0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0
Call Trace:
<IRQ>
tcp_write_timer (net/ipv4/tcp_timer.c:738)
call_timer_fn (kernel/time/timer.c:1747)
__run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372)
timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135)
tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035)
__walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1))
tmigr_handle_remote (kernel/time/timer_migration.c:1096)
handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)
irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696)
sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35))
</IRQ>
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
Assigner
References
9 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 7ec092a91ff351dcde89c23e795b73a328274db6
(git)
Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < a4378dedd6e07e62f2fccb17d78c9665718763d0 (git) Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 33a4fdf0b4a25f8ce65380c3b0136b407ca57609 (git) Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 17d699727577814198d744d6afe54735c6b54c99 (git) Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < dfd06131107e7b699ef1e2a24ed2f7d17c917753 (git) Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < fa4749c065644af4db496b338452a69a3e5147d9 (git) Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < ae313d14b45eca7a6bb29cb9bf396d977e7d28fb (git) Affected: 8336886f786fdacbc19b719c1f7ea91eb70706d4 , < 45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01 (git) |
guessed | |
| Linux | Linux |
Affected:
3.7
Unaffected: 0 , < 3.7 (semver) Unaffected: 5.4.300 , ≤ 5.4.* (semver) Unaffected: 5.10.245 , ≤ 5.10.* (semver) Unaffected: 5.15.194 , ≤ 5.15.* (semver) Unaffected: 6.1.154 , ≤ 6.1.* (semver) Unaffected: 6.6.108 , ≤ 6.6.* (semver) Unaffected: 6.12.49 , ≤ 6.12.* (semver) Unaffected: 6.16.9 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-39955",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-10T20:41:49.740642Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-11T18:44:16.576Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"affected": [
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "V3.1.6",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "V3.1.6",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "V3.1.6",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "V3.1.6",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
"vendor": "Siemens",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "V3.1.6",
"versionType": "custom"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-08T08:42:36.220Z",
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP"
},
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
}
],
"x_adpType": "supplier"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/ipv4/tcp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7ec092a91ff351dcde89c23e795b73a328274db6",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "a4378dedd6e07e62f2fccb17d78c9665718763d0",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "33a4fdf0b4a25f8ce65380c3b0136b407ca57609",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "17d699727577814198d744d6afe54735c6b54c99",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "dfd06131107e7b699ef1e2a24ed2f7d17c917753",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "fa4749c065644af4db496b338452a69a3e5147d9",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "ae313d14b45eca7a6bb29cb9bf396d977e7d28fb",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
},
{
"lessThan": "45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01",
"status": "affected",
"version": "8336886f786fdacbc19b719c1f7ea91eb70706d4",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv4/tcp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"lessThan": "3.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.300",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.245",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.194",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.154",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.108",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.49",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.300",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.245",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.194",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.154",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.108",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.49",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.9",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17",
"versionStartIncluding": "3.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().\n\nsyzbot reported the splat below where a socket had tcp_sk(sk)-\u003efastopen_rsk\nin the TCP_ESTABLISHED state. [0]\n\nsyzbot reused the server-side TCP Fast Open socket as a new client before\nthe TFO socket completes 3WHS:\n\n 1. accept()\n 2. connect(AF_UNSPEC)\n 3. connect() to another destination\n\nAs of accept(), sk-\u003esk_state is TCP_SYN_RECV, and tcp_disconnect() changes\nit to TCP_CLOSE and makes connect() possible, which restarts timers.\n\nSince tcp_disconnect() forgot to clear tcp_sk(sk)-\u003efastopen_rsk, the\nretransmit timer triggered the warning and the intended packet was not\nretransmitted.\n\nLet\u0027s call reqsk_fastopen_remove() in tcp_disconnect().\n\n[0]:\nWARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\nModules linked in:\nCPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\nCode: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 \u003c0f\u003e 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e\nRSP: 0018:ffffc900002f8d40 EFLAGS: 00010293\nRAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017\nRDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400\nRBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8\nR10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540\nR13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0\nFS: 0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0\nCall Trace:\n \u003cIRQ\u003e\n tcp_write_timer (net/ipv4/tcp_timer.c:738)\n call_timer_fn (kernel/time/timer.c:1747)\n __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372)\n timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135)\n tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035)\n __walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1))\n tmigr_handle_remote (kernel/time/timer_migration.c:1096)\n handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)\n irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35))\n \u003c/IRQ\u003e"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:39:39.433Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7ec092a91ff351dcde89c23e795b73a328274db6"
},
{
"url": "https://git.kernel.org/stable/c/a4378dedd6e07e62f2fccb17d78c9665718763d0"
},
{
"url": "https://git.kernel.org/stable/c/33a4fdf0b4a25f8ce65380c3b0136b407ca57609"
},
{
"url": "https://git.kernel.org/stable/c/17d699727577814198d744d6afe54735c6b54c99"
},
{
"url": "https://git.kernel.org/stable/c/dfd06131107e7b699ef1e2a24ed2f7d17c917753"
},
{
"url": "https://git.kernel.org/stable/c/fa4749c065644af4db496b338452a69a3e5147d9"
},
{
"url": "https://git.kernel.org/stable/c/ae313d14b45eca7a6bb29cb9bf396d977e7d28fb"
},
{
"url": "https://git.kernel.org/stable/c/45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01"
}
],
"title": "tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39955",
"datePublished": "2025-10-09T09:47:33.556Z",
"dateReserved": "2025-04-16T07:20:57.149Z",
"dateUpdated": "2026-09-08T08:42:36.220Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2025-39955",
"date": "2026-09-16",
"epss": "0.00157",
"percentile": "0.05284"
},
"microsoft_vex": {
"current_release_date": "2025-10-10T01:02:17.000Z",
"cve": "CVE-2025-39955",
"id": "msrc_CVE-2025-39955",
"initial_release_date": "2025-10-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "2",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39955.json",
"version": "1"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39955\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-09T10:15:36.220\",\"lastModified\":\"2026-07-14T13:17:51.527\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().\\n\\nsyzbot reported the splat below where a socket had tcp_sk(sk)-\u003efastopen_rsk\\nin the TCP_ESTABLISHED state. [0]\\n\\nsyzbot reused the server-side TCP Fast Open socket as a new client before\\nthe TFO socket completes 3WHS:\\n\\n 1. accept()\\n 2. connect(AF_UNSPEC)\\n 3. connect() to another destination\\n\\nAs of accept(), sk-\u003esk_state is TCP_SYN_RECV, and tcp_disconnect() changes\\nit to TCP_CLOSE and makes connect() possible, which restarts timers.\\n\\nSince tcp_disconnect() forgot to clear tcp_sk(sk)-\u003efastopen_rsk, the\\nretransmit timer triggered the warning and the intended packet was not\\nretransmitted.\\n\\nLet\u0027s call reqsk_fastopen_remove() in tcp_disconnect().\\n\\n[0]:\\nWARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\\nModules linked in:\\nCPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\nRIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\\nCode: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 \u003c0f\u003e 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e\\nRSP: 0018:ffffc900002f8d40 EFLAGS: 00010293\\nRAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017\\nRDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400\\nRBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8\\nR10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540\\nR13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0\\nFS: 0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000\\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0\\nCall Trace:\\n \u003cIRQ\u003e\\n tcp_write_timer (net/ipv4/tcp_timer.c:738)\\n call_timer_fn (kernel/time/timer.c:1747)\\n __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372)\\n timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135)\\n tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035)\\n __walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1))\\n tmigr_handle_remote (kernel/time/timer_migration.c:1096)\\n handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)\\n irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696)\\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35))\\n \u003c/IRQ\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"7ec092a91ff351dcde89c23e795b73a328274db6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"a4378dedd6e07e62f2fccb17d78c9665718763d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"33a4fdf0b4a25f8ce65380c3b0136b407ca57609\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"17d699727577814198d744d6afe54735c6b54c99\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"dfd06131107e7b699ef1e2a24ed2f7d17c917753\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"fa4749c065644af4db496b338452a69a3e5147d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"ae313d14b45eca7a6bb29cb9bf396d977e7d28fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8336886f786fdacbc19b719c1f7ea91eb70706d4\",\"lessThan\":\"45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.300\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.245\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.194\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.154\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.108\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.49\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.9\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-10T20:41:49.740642Z\",\"id\":\"CVE-2025-39955\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.7\",\"versionEndExcluding\":\"5.4.300\",\"matchCriteriaId\":\"EF3A9D25-ED48-454C-90BC-70C637BF3185\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.245\",\"matchCriteriaId\":\"B0E443AF-02FC-45A1-9CD7-3F80A65F1A15\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.194\",\"matchCriteriaId\":\"CF862263-DC8D-4324-A52A-DA1D7880B35A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.154\",\"matchCriteriaId\":\"E49CD91E-FC55-45B0-BB63-9AD5F5D70CAA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.108\",\"matchCriteriaId\":\"A7E8EAEE-7731-4996-9578-696255D61EA2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.49\",\"matchCriteriaId\":\"CAA033E9-A2C5-4976-A83E-9804D8FB827F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.9\",\"matchCriteriaId\":\"638DD910-1189-4F5E-98BF-2D436B695112\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"327D22EF-390B-454C-BD31-2ED23C998A1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C730CD9A-D969-4A8E-9522-162AAF7C0EE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"39982C4B-716E-4B2F-8196-FA301F47807D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"340BEEA9-D70D-4290-B502-FBB1032353B1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"47E4C5C0-079F-4838-971B-8C503D48FCC2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A4516A6-C12E-42A4-8C0E-68AEF3264504\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/17d699727577814198d744d6afe54735c6b54c99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/33a4fdf0b4a25f8ce65380c3b0136b407ca57609\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7ec092a91ff351dcde89c23e795b73a328274db6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a4378dedd6e07e62f2fccb17d78c9665718763d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ae313d14b45eca7a6bb29cb9bf396d977e7d28fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dfd06131107e7b699ef1e2a24ed2f7d17c917753\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fa4749c065644af4db496b338452a69a3e5147d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:25:34+00:00",
"cve": "CVE-2025-39955",
"id": "CVE-2025-39955",
"initial_release_date": "2025-10-09T00:00:00+00:00",
"product_status:fixed": "2416",
"product_status:known_affected": "22",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39955.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-13T23:39:09Z",
"cve": "CVE-2025-39955",
"id": "CVE-2025-39955",
"initial_release_date": "2025-10-09T23:23:12Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "723",
"product_status:known_not_affected": "6",
"product_status:recommended": "575",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39955",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39955.json",
"version": "51"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-07-14T12:43:08.999Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-39955\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:41:49.740642Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:38:46.298Z\"}}], \"cna\": {\"title\": \"tcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"7ec092a91ff351dcde89c23e795b73a328274db6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"a4378dedd6e07e62f2fccb17d78c9665718763d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"33a4fdf0b4a25f8ce65380c3b0136b407ca57609\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"17d699727577814198d744d6afe54735c6b54c99\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"dfd06131107e7b699ef1e2a24ed2f7d17c917753\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"fa4749c065644af4db496b338452a69a3e5147d9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"ae313d14b45eca7a6bb29cb9bf396d977e7d28fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8336886f786fdacbc19b719c1f7ea91eb70706d4\", \"lessThan\": \"45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/tcp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.300\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.245\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.194\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.108\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.49\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.16.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/tcp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7ec092a91ff351dcde89c23e795b73a328274db6\"}, {\"url\": \"https://git.kernel.org/stable/c/a4378dedd6e07e62f2fccb17d78c9665718763d0\"}, {\"url\": \"https://git.kernel.org/stable/c/33a4fdf0b4a25f8ce65380c3b0136b407ca57609\"}, {\"url\": \"https://git.kernel.org/stable/c/17d699727577814198d744d6afe54735c6b54c99\"}, {\"url\": \"https://git.kernel.org/stable/c/dfd06131107e7b699ef1e2a24ed2f7d17c917753\"}, {\"url\": \"https://git.kernel.org/stable/c/fa4749c065644af4db496b338452a69a3e5147d9\"}, {\"url\": \"https://git.kernel.org/stable/c/ae313d14b45eca7a6bb29cb9bf396d977e7d28fb\"}, {\"url\": \"https://git.kernel.org/stable/c/45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntcp: Clear tcp_sk(sk)-\u003efastopen_rsk in tcp_disconnect().\\n\\nsyzbot reported the splat below where a socket had tcp_sk(sk)-\u003efastopen_rsk\\nin the TCP_ESTABLISHED state. [0]\\n\\nsyzbot reused the server-side TCP Fast Open socket as a new client before\\nthe TFO socket completes 3WHS:\\n\\n 1. accept()\\n 2. connect(AF_UNSPEC)\\n 3. connect() to another destination\\n\\nAs of accept(), sk-\u003esk_state is TCP_SYN_RECV, and tcp_disconnect() changes\\nit to TCP_CLOSE and makes connect() possible, which restarts timers.\\n\\nSince tcp_disconnect() forgot to clear tcp_sk(sk)-\u003efastopen_rsk, the\\nretransmit timer triggered the warning and the intended packet was not\\nretransmitted.\\n\\nLet\u0027s call reqsk_fastopen_remove() in tcp_disconnect().\\n\\n[0]:\\nWARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\\nModules linked in:\\nCPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary)\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\nRIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7))\\nCode: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 \u003c0f\u003e 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e\\nRSP: 0018:ffffc900002f8d40 EFLAGS: 00010293\\nRAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017\\nRDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400\\nRBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8\\nR10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540\\nR13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0\\nFS: 0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000\\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0\\nCall Trace:\\n \u003cIRQ\u003e\\n tcp_write_timer (net/ipv4/tcp_timer.c:738)\\n call_timer_fn (kernel/time/timer.c:1747)\\n __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372)\\n timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135)\\n tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035)\\n __walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1))\\n tmigr_handle_remote (kernel/time/timer_migration.c:1096)\\n handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580)\\n irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696)\\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35))\\n \u003c/IRQ\u003e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.300\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.245\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.194\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.154\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.108\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.49\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.9\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:39:39.433Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-39955\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:43:08.999Z\", \"dateReserved\": \"2025-04-16T07:20:57.149Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-10-09T09:47:33.556Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…