CVE-2026-98175
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: cancel reconnect work in clean_demultiplex_info() clean_demultiplex_info() cancels server->echo delayed work but not server->reconnect, which can cause a use-after-free when the demultiplex thread exits while a reconnect work is still queued: cifs_demultiplex_thread() cifs_readv_from_socket() cifs_reconnect() __cifs_reconnect() cifs_queue_server_reconn() mod_delayed_work(cifsiod_wq, &server->reconnect, 0) clean_demultiplex_info() cancel_delayed_work_sync(&server->echo) // echo canceled // reconnect NOT canceled kfree_sensitive(server) // server freed ...later, on cifsiod_wq: smb2_reconnect_server() server->srv_count // UAF read of freed server Fix this by canceling server->reconnect delayed work in clean_demultiplex_info() before the server is freed, the same way cifs_put_tcp_session() already does.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-10-06 09:17:59.477000
Last modified
2026-10-19 10:18:17.840000
View original CVE JSON
{
"id": "CVE-2026-98175",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-06T09:17:59.477",
"lastModified": "2026-10-19T10:18:17.840",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: cancel reconnect work in clean_demultiplex_info()\n\nclean_demultiplex_info() cancels server->echo delayed work but not\nserver->reconnect, which can cause a use-after-free when the\ndemultiplex thread exits while a reconnect work is still queued:\n\n cifs_demultiplex_thread()\n cifs_readv_from_socket()\n cifs_reconnect()\n __cifs_reconnect()\n cifs_queue_server_reconn()\n mod_delayed_work(cifsiod_wq, &server->reconnect, 0)\n clean_demultiplex_info()\n cancel_delayed_work_sync(&server->echo) // echo canceled\n // reconnect NOT canceled\n kfree_sensitive(server) // server freed\n\n ...later, on cifsiod_wq:\n\n smb2_reconnect_server()\n server->srv_count // UAF read of freed server\n\nFix this by canceling server->reconnect delayed work in\nclean_demultiplex_info() before the server is freed, the same way\ncifs_put_tcp_session() already does."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/smb/client/connect.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
"lessThan": "180380272f116dbd2b0354c5c7872e112e519149",
"versionType": "git",
"status": "affected"
},
{
"version": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
"lessThan": "e3f6a779433d13aafb5edab59e4f9313051e8a52",
"versionType": "git",
"status": "affected"
},
{
"version": "53e0e11efe9289535b060a51d4cf37c25e0d0f2b",
"lessThan": "7ab9ceedd860216fb97f2d8574cbe58b8906f42a",
"versionType": "git",
"status": "affected"
},
{
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"versionType": "git",
"status": "affected"
},
{
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"lessThan": "c65eae6f61d1778ff7a82e4aae4080e26f486af1",
"versionType": "git",
"status": "affected"
},
{
"version": "e008a962311a875a828cbae54b43285858aaa6c8",
"versionType": "git",
"status": "affected"
},
{
"version": "123b228a09b90b50b0a9d6eb8294cf0c42efc029",
"versionType": "git",
"status": "affected"
},
{
"version": "0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9",
"versionType": "git",
"status": "affected"
},
{
"version": "d0d2a4c82942e2f51e4984beea1f7e5a994bd06c",
"versionType": "git",
"status": "affected"
},
{
"version": "15a12fbbf365a483b1c19f9caeb707b3bea77e10",
"versionType": "git",
"status": "affected"
},
{
"version": "f0b715409cb9cf7e21e690f9b163047739761962",
"versionType": "git",
"status": "affected"
},
{
"version": "ff04da387c10b6bf7b510392742c8cd46c130fd6",
"versionType": "git",
"status": "affected"
},
{
"version": "48f9526f4dcb4b132fe0dc2450835311e3b013a6",
"versionType": "git",
"status": "affected"
},
{
"version": "3.10.107",
"lessThan": "3.11",
"versionType": "semver",
"status": "affected"
},
{
"version": "3.12.70",
"lessThan": "3.13",
"versionType": "semver",
"status": "affected"
},
{
"version": "3.16.42",
"lessThan": "3.17",
"versionType": "semver",
"status": "affected"
},
{
"version": "3.18.47",
"lessThan": "3.19",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.1.38",
"lessThan": "4.2",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.4.40",
"lessThan": "4.5",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.8.16",
"lessThan": "4.9",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.9.1",
"lessThan": "4.10",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/smb/client/connect.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "4.10",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.10",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.54",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.8",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.6,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}