{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98773", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.369Z", "datePublished": "2026-10-18T15:48:09.093Z", "dateUpdated": "2026-10-30T12:39:41.890Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:39:41.890Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: cdc-acm: skip URB restart in port_shutdown if disconnected\n\nacm_port_shutdown() is called from the tty-port machinery whenever the\nlast user closes the port. acm_disconnect() sets acm->disconnected and\ncalls tty_port_tty_vhangup(), which eventually triggers port_shutdown().\nAt that point acm_disconnect() has already called acm_poison_urbs() and\nis about to free the control and read URBs.\n\nHowever, acm_port_shutdown() unconditionally calls acm_unpoison_urbs()\nand, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the\nctrlurb and all read URBs. If the concurrent acm_disconnect() then\nfrees those URBs and their DMA buffers while they are in-flight, the\nresult is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback()\naccessing the freed DMA memory.\n\nFix by checking acm->disconnected after draining the delayed anchor and\nreturning early: if we are in a disconnect path the URBs must remain\npoisoned and must not be resubmitted.\n\nThe early return is placed after the delayed-anchor drain loop because\nthat loop only cancels write-side accounting (wb->use = false and\nautopm counter) and does not touch the hardware path."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/class/cdc-acm.c"], "versions": [{"version": "d826061aa64cb28089bf4c73e301dd7928662b84", "lessThan": "d97da42e9de577dc827d4e8866e6971deefe2d9c", "status": "affected", "versionType": "git"}, {"version": "8fb82e3555a7d56a05d8ef0edee9859f889c0860", "lessThan": "d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0", "status": "affected", "versionType": "git"}, {"version": "603d5a7110832e10165d21f9a1486399457177de", "lessThan": "9742905d9ed5bf23ebe4c100dec80b6bc50fb522", "status": "affected", "versionType": "git"}, {"version": "5d29d7ff8679e5a525f22da467ba33c042e8029b", "lessThan": "a0ed07b5bbb2d8fcef86810453216070691816e7", "status": "affected", "versionType": "git"}, {"version": "f58752ebcb35e156c85cd1a82d6579c7af3b9023", "lessThan": "420ca35af891d33522cc08504768ccd60a4c450a", "status": "affected", "versionType": "git"}, {"version": "f58752ebcb35e156c85cd1a82d6579c7af3b9023", "lessThan": "dc614d6bc991740d41d5a99ac7765c4b675dda88", "status": "affected", "versionType": "git"}, {"version": "283f8162cc3c82086537cbc7dc01870dbeb07a91", "status": "affected", "versionType": "git"}, {"version": "f77f10bc76c2da86b4248269472f6d971e37828b", "status": "affected", "versionType": "git"}, {"version": "6.1.175", "lessThan": "6.1.191", "status": "affected", "versionType": "semver"}, {"version": "6.6.136", "lessThan": "6.6.160", "status": "affected", "versionType": "semver"}, {"version": "6.12.83", "lessThan": "6.12.113", "status": "affected", "versionType": "semver"}, {"version": "6.18.24", "lessThan": "6.18.56", "status": "affected", "versionType": "semver"}, {"version": "6.19.14", "lessThan": "6.20", "status": "affected", "versionType": "semver"}, {"version": "7.0.1", "lessThan": "7.1", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/class/cdc-acm.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.175", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.136", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.83", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.24", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d97da42e9de577dc827d4e8866e6971deefe2d9c"}, {"url": "https://git.kernel.org/stable/c/d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0"}, {"url": "https://git.kernel.org/stable/c/9742905d9ed5bf23ebe4c100dec80b6bc50fb522"}, {"url": "https://git.kernel.org/stable/c/a0ed07b5bbb2d8fcef86810453216070691816e7"}, {"url": "https://git.kernel.org/stable/c/420ca35af891d33522cc08504768ccd60a4c450a"}, {"url": "https://git.kernel.org/stable/c/dc614d6bc991740d41d5a99ac7765c4b675dda88"}], "title": "USB: cdc-acm: skip URB restart in port_shutdown if disconnected", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/usb/class/cdc-acm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d97da42e9de577dc827d4e8866e6971deefe2d9c", "status": "affected", "version": "d826061aa64cb28089bf4c73e301dd7928662b84", "versionType": "git"}, {"lessThan": "d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0", "status": "affected", "version": "8fb82e3555a7d56a05d8ef0edee9859f889c0860", "versionType": "git"}, {"lessThan": "9742905d9ed5bf23ebe4c100dec80b6bc50fb522", "status": "affected", "version": "603d5a7110832e10165d21f9a1486399457177de", "versionType": "git"}, {"lessThan": "a0ed07b5bbb2d8fcef86810453216070691816e7", "status": "affected", "version": "5d29d7ff8679e5a525f22da467ba33c042e8029b", "versionType": "git"}, {"lessThan": "420ca35af891d33522cc08504768ccd60a4c450a", "status": "affected", "version": "f58752ebcb35e156c85cd1a82d6579c7af3b9023", "versionType": "git"}, {"lessThan": "dc614d6bc991740d41d5a99ac7765c4b675dda88", "status": "affected", "version": "f58752ebcb35e156c85cd1a82d6579c7af3b9023", "versionType": "git"}, {"status": "affected", "version": "283f8162cc3c82086537cbc7dc01870dbeb07a91", "versionType": "git"}, {"status": "affected", "version": "f77f10bc76c2da86b4248269472f6d971e37828b", "versionType": "git"}, {"lessThan": "6.1.191", "status": "affected", "version": "6.1.175", "versionType": "semver"}, {"lessThan": "6.6.160", "status": "affected", "version": "6.6.136", "versionType": "semver"}, {"lessThan": "6.12.113", "status": "affected", "version": "6.12.83", "versionType": "semver"}, {"lessThan": "6.18.56", "status": "affected", "version": "6.18.24", "versionType": "semver"}, {"lessThan": "6.20", "status": "affected", "version": "6.19.14", "versionType": "semver"}, {"lessThan": "7.1", "status": "affected", "version": "7.0.1", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/usb/class/cdc-acm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: cdc-acm: skip URB restart in port_shutdown if disconnected\n\nacm_port_shutdown() is called from the tty-port machinery whenever the\nlast user closes the port. acm_disconnect() sets acm->disconnected and\ncalls tty_port_tty_vhangup(), which eventually triggers port_shutdown().\nAt that point acm_disconnect() has already called acm_poison_urbs() and\nis about to free the control and read URBs.\n\nHowever, acm_port_shutdown() unconditionally calls acm_unpoison_urbs()\nand, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the\nctrlurb and all read URBs. If the concurrent acm_disconnect() then\nfrees those URBs and their DMA buffers while they are in-flight, the\nresult is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback()\naccessing the freed DMA memory.\n\nFix by checking acm->disconnected after draining the delayed anchor and\nreturning early: if we are in a disconnect path the URBs must remain\npoisoned and must not be resubmitted.\n\nThe early return is placed after the delayed-anchor drain loop because\nthat loop only cancels write-side accounting (wb->use = false and\nautopm counter) and does not touch the hardware path."}], "id": "CVE-2026-98773", "lastModified": "2026-10-30T13:21:27.007", "metrics": {}, "published": "2026-10-18T16:17:31.223", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/420ca35af891d33522cc08504768ccd60a4c450a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9742905d9ed5bf23ebe4c100dec80b6bc50fb522"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a0ed07b5bbb2d8fcef86810453216070691816e7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d97da42e9de577dc827d4e8866e6971deefe2d9c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc614d6bc991740d41d5a99ac7765c4b675dda88"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: USB: cdc-acm: skip URB restart in port_shutdown if disconnected", "id": "2555078", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555078"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nUSB: cdc-acm: skip URB restart in port_shutdown if disconnected\nacm_port_shutdown() is called from the tty-port machinery whenever the\nlast user closes the port. acm_disconnect() sets acm->disconnected and\ncalls tty_port_tty_vhangup(), which eventually triggers port_shutdown().\nAt that point acm_disconnect() has already called acm_poison_urbs() and\nis about to free the control and read URBs.\nHowever, acm_port_shutdown() unconditionally calls acm_unpoison_urbs()\nand, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the\nctrlurb and all read URBs. If the concurrent acm_disconnect() then\nfrees those URBs and their DMA buffers while they are in-flight, the\nresult is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback()\naccessing the freed DMA memory.\nFix by checking acm->disconnected after draining the delayed anchor and\nreturning early: if we are in a disconnect path the URBs must remain\npoisoned and must not be resubmitted.\nThe early return is placed after the delayed-anchor drain loop because\nthat loop only cancels write-side accounting (wb->use = false and\nautopm counter) and does not touch the hardware path.", "A flaw was found in the Linux kernel's CDC ACM (Communications Device Class Abstract Control Model) USB driver. A timing race condition during device disconnection and port closure can lead to a use-after-free vulnerability when communication requests attempt to access already freed memory buffers. A local attacker could exploit this flaw to cause a Denial of Service (DoS) via a system crash or potentially achieve privilege escalation."], "name": "CVE-2026-98773", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98773\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98773\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98773.mbox"], "threat_severity": "Moderate"}