CVE-2024-56670

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-56670", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T15:00:39.844Z", "datePublished": "2024-12-27T15:06:31.611Z", "dateUpdated": "2026-05-11T20:56:58.889Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:56:58.889Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer\n\nConsidering that in some extreme cases,\nwhen u_serial driver is accessed by multiple threads,\nThread A is executing the open operation and calling the gs_open,\nThread B is executing the disconnect operation and calling the\ngserial_disconnect function,The port->port_usb pointer will be set to NULL.\n\nE.g.\n Thread A Thread B\n gs_open() gadget_unbind_driver()\n gs_start_io() composite_disconnect()\n gs_start_rx() gserial_disconnect()\n ... ...\n spin_unlock(&port->port_lock)\n status = usb_ep_queue() spin_lock(&port->port_lock)\n spin_lock(&port->port_lock) port->port_usb = NULL\n gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock)\n Crash\n\nThis causes thread A to access a null pointer (port->port_usb is null)\nwhen calling the gs_free_requests function, causing a crash.\n\nIf port_usb is NULL, the release request will be skipped as it\nwill be done by gserial_disconnect.\n\nSo add a null pointer check to gs_start_io before attempting\nto access the value of the pointer port->port_usb.\n\nCall trace:\n gs_start_io+0x164/0x25c\n gs_open+0x108/0x13c\n tty_open+0x314/0x638\n chrdev_open+0x1b8/0x258\n do_dentry_open+0x2c4/0x700\n vfs_open+0x2c/0x3c\n path_openat+0xa64/0xc60\n do_filp_open+0xb8/0x164\n do_sys_openat2+0x84/0xf0\n __arm64_sys_openat+0x70/0x9c\n invoke_syscall+0x58/0x114\n el0_svc_common+0x80/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x38/0x68"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/u_serial.c"], "versions": [{"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "4efdfdc32d8d6307f968cd99f1db64468471bab1", "status": "affected", "versionType": "git"}, {"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "28b3c03a6790de1f6f2683919ad657840f0f0f58", "status": "affected", "versionType": "git"}, {"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "1247e1df086aa6c17ab53cd1bedce70dd7132765", "status": "affected", "versionType": "git"}, {"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "c83213b6649d22656b3a4e92544ceeea8a2c6c07", "status": "affected", "versionType": "git"}, {"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "8ca07a3d18f39b1669927ef536e485787e856df6", "status": "affected", "versionType": "git"}, {"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44", "status": "affected", "versionType": "git"}, {"version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/u_serial.c"], "versions": [{"version": "2.6.27", "status": "affected"}, {"version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.288", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.232", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.175", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.121", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.67", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.6", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "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": "2.6.27", "versionEndExcluding": "5.4.288"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.10.232"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.121"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.67"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4efdfdc32d8d6307f968cd99f1db64468471bab1"}, {"url": "https://git.kernel.org/stable/c/28b3c03a6790de1f6f2683919ad657840f0f0f58"}, {"url": "https://git.kernel.org/stable/c/1247e1df086aa6c17ab53cd1bedce70dd7132765"}, {"url": "https://git.kernel.org/stable/c/c83213b6649d22656b3a4e92544ceeea8a2c6c07"}, {"url": "https://git.kernel.org/stable/c/8ca07a3d18f39b1669927ef536e485787e856df6"}, {"url": "https://git.kernel.org/stable/c/dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44"}, {"url": "https://git.kernel.org/stable/c/4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b"}], "title": "usb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2024-56670", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-10-01T19:59:37.791870Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:09.242Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:52:17.369Z"}}]}}

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{"title": "usb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "4efdfdc32d8d6307f968cd99f1db64468471bab1", "versionType": "git"}, {"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "28b3c03a6790de1f6f2683919ad657840f0f0f58", "versionType": "git"}, {"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "1247e1df086aa6c17ab53cd1bedce70dd7132765", "versionType": "git"}, {"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "c83213b6649d22656b3a4e92544ceeea8a2c6c07", "versionType": "git"}, {"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "8ca07a3d18f39b1669927ef536e485787e856df6", "versionType": "git"}, {"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44", "versionType": "git"}, {"status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "lessThan": "4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b", "versionType": "git"}], "programFiles": ["drivers/usb/gadget/function/u_serial.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.27", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.288", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.232", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.175", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.121", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.67", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.6", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/usb/gadget/function/u_serial.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4efdfdc32d8d6307f968cd99f1db64468471bab1"}, {"url": "https://git.kernel.org/stable/c/28b3c03a6790de1f6f2683919ad657840f0f0f58"}, {"url": "https://git.kernel.org/stable/c/1247e1df086aa6c17ab53cd1bedce70dd7132765"}, {"url": "https://git.kernel.org/stable/c/c83213b6649d22656b3a4e92544ceeea8a2c6c07"}, {"url": "https://git.kernel.org/stable/c/8ca07a3d18f39b1669927ef536e485787e856df6"}, {"url": "https://git.kernel.org/stable/c/dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44"}, {"url": "https://git.kernel.org/stable/c/4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer\n\nConsidering that in some extreme cases,\nwhen u_serial driver is accessed by multiple threads,\nThread A is executing the open operation and calling the gs_open,\nThread B is executing the disconnect operation and calling the\ngserial_disconnect function,The port->port_usb pointer will be set to NULL.\n\nE.g.\n Thread A Thread B\n gs_open() gadget_unbind_driver()\n gs_start_io() composite_disconnect()\n gs_start_rx() gserial_disconnect()\n ... ...\n spin_unlock(&port->port_lock)\n status = usb_ep_queue() spin_lock(&port->port_lock)\n spin_lock(&port->port_lock) port->port_usb = NULL\n gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock)\n Crash\n\nThis causes thread A to access a null pointer (port->port_usb is null)\nwhen calling the gs_free_requests function, causing a crash.\n\nIf port_usb is NULL, the release request will be skipped as it\nwill be done by gserial_disconnect.\n\nSo add a null pointer check to gs_start_io before attempting\nto access the value of the pointer port->port_usb.\n\nCall trace:\n gs_start_io+0x164/0x25c\n gs_open+0x108/0x13c\n tty_open+0x314/0x638\n chrdev_open+0x1b8/0x258\n do_dentry_open+0x2c4/0x700\n vfs_open+0x2c/0x3c\n path_openat+0xa64/0xc60\n do_filp_open+0xb8/0x164\n do_sys_openat2+0x84/0xf0\n __arm64_sys_openat+0x70/0x9c\n invoke_syscall+0x58/0x114\n el0_svc_common+0x80/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x38/0x68"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.288", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.232", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.175", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.121", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.67", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.6", "versionStartIncluding": "2.6.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "2.6.27"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T10:01:40.207Z"}}}, "cveMetadata": {"cveId": "CVE-2024-56670", "state": "PUBLISHED", "dateUpdated": "2025-10-01T20:07:09.242Z", "dateReserved": "2024-12-27T15:00:39.844Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-12-27T15:06:31.611Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

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"c1dca562be8ada614ef193aa246c6f8705bcd6b9", "versionType": "git"}, {"lessThan": "dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44", "status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "versionType": "git"}, {"lessThan": "4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b", "status": "affected", "version": "c1dca562be8ada614ef193aa246c6f8705bcd6b9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/usb/gadget/function/u_serial.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"lessThan": "2.6.27", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.288", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.232", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.175", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.121", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.67", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6E124544-1BF2-4F82-8695-47BCE74E1600", "versionEndExcluding": "5.4.288", "versionStartIncluding": "2.6.27", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0B975945-2894-4433-BA59-0988B75B4C12", "versionEndExcluding": "5.10.232", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7A1F3620-6900-4852-9229-C3527377EBDA", "versionEndExcluding": "5.15.175", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D8DA16A0-9C6E-493E-90EE-309A34901477", "versionEndExcluding": "6.1.121", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BF4F2CD1-2CA6-4D6B-9B0C-57C3C4D6544A", "versionEndExcluding": "6.6.67", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0CB1A9BB-F95E-43DD-A2FD-147912FD91E5", "versionEndExcluding": "6.12.6", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer\n\nConsidering that in some extreme cases,\nwhen u_serial driver is accessed by multiple threads,\nThread A is executing the open operation and calling the gs_open,\nThread B is executing the disconnect operation and calling the\ngserial_disconnect function,The port->port_usb pointer will be set to NULL.\n\nE.g.\n Thread A Thread B\n gs_open() gadget_unbind_driver()\n gs_start_io() composite_disconnect()\n gs_start_rx() gserial_disconnect()\n ... ...\n spin_unlock(&port->port_lock)\n status = usb_ep_queue() spin_lock(&port->port_lock)\n spin_lock(&port->port_lock) port->port_usb = NULL\n gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock)\n Crash\n\nThis causes thread A to access a null pointer (port->port_usb is null)\nwhen calling the gs_free_requests function, causing a crash.\n\nIf port_usb is NULL, the release request will be skipped as it\nwill be done by gserial_disconnect.\n\nSo add a null pointer check to gs_start_io before attempting\nto access the value of the pointer port->port_usb.\n\nCall trace:\n gs_start_io+0x164/0x25c\n gs_open+0x108/0x13c\n tty_open+0x314/0x638\n chrdev_open+0x1b8/0x258\n do_dentry_open+0x2c4/0x700\n vfs_open+0x2c/0x3c\n path_openat+0xa64/0xc60\n do_filp_open+0xb8/0x164\n do_sys_openat2+0x84/0xf0\n __arm64_sys_openat+0x70/0x9c\n invoke_syscall+0x58/0x114\n el0_svc_common+0x80/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x38/0x68"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: u_serial: soluciona el problema por el cual gs_start_io se bloqueaba debido al acceso a un puntero nulo. Teniendo en cuenta que en algunos casos extremos, cuando varios subprocesos acceden al controlador u_serial, el subproceso A ejecuta la operaci\u00f3n de apertura y llama a gs_open, el subproceso B ejecuta la operaci\u00f3n de desconexi\u00f3n y llama a la funci\u00f3n gserial_disconnect, el puntero port->port_usb se establecer\u00e1 en NULL. P. ej. Hilo A Hilo B gs_open() gadget_unbind_driver() gs_start_io() composite_disconnect() gs_start_rx() gserial_disconnect() ... ... spin_unlock(&port->port_lock) status = usb_ep_queue() spin_lock(&port->port_lock) spin_lock(&port->port_lock) port->port_usb = NULL gs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock) Bloqueo Esto hace que el hilo A acceda a un puntero nulo (port->port_usb es nulo) al llamar a la funci\u00f3n gs_free_requests, lo que provoca un bloqueo. Si port_usb es NULL, se omitir\u00e1 la solicitud de liberaci\u00f3n, ya que la realizar\u00e1 gserial_disconnect. Por lo tanto, agregue una verificaci\u00f3n de puntero nulo a gs_start_io antes de intentar acceder al valor del puntero port->port_usb. Rastreo de llamadas: gs_start_io+0x164/0x25c gs_open+0x108/0x13c tty_open+0x314/0x638 chrdev_open+0x1b8/0x258 do_dentry_open+0x2c4/0x700 vfs_open+0x2c/0x3c path_openat+0xa64/0xc60 do_filp_open+0xb8/0x164 do_sys_openat2+0x84/0xf0 __arm64_sys_openat+0x70/0x9c invocar_syscall+0x58/0x114 el0_svc_common+0x80/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x38/0x68"}], "id": "CVE-2024-56670", "lastModified": "2026-06-17T08:12:42.350", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-56670", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:59:37.791870Z", "version": "2.0.3"}}]}, "published": "2024-12-27T15:15:26.890", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1247e1df086aa6c17ab53cd1bedce70dd7132765"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/28b3c03a6790de1f6f2683919ad657840f0f0f58"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4efdfdc32d8d6307f968cd99f1db64468471bab1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8ca07a3d18f39b1669927ef536e485787e856df6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c83213b6649d22656b3a4e92544ceeea8a2c6c07"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: usb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer", "id": "2334569", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334569"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nusb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer\nConsidering that in some extreme cases,\nwhen u_serial driver is accessed by multiple threads,\nThread A is executing the open operation and calling the gs_open,\nThread B is executing the disconnect operation and calling the\ngserial_disconnect function,The port->port_usb pointer will be set to NULL.\nE.g.\nThread A Thread B\ngs_open() gadget_unbind_driver()\ngs_start_io() composite_disconnect()\ngs_start_rx() gserial_disconnect()\n... ...\nspin_unlock(&port->port_lock)\nstatus = usb_ep_queue() spin_lock(&port->port_lock)\nspin_lock(&port->port_lock) port->port_usb = NULL\ngs_free_requests(port->port_usb->in) spin_unlock(&port->port_lock)\nCrash\nThis causes thread A to access a null pointer (port->port_usb is null)\nwhen calling the gs_free_requests function, causing a crash.\nIf port_usb is NULL, the release request will be skipped as it\nwill be done by gserial_disconnect.\nSo add a null pointer check to gs_start_io before attempting\nto access the value of the pointer port->port_usb.\nCall trace:\ngs_start_io+0x164/0x25c\ngs_open+0x108/0x13c\ntty_open+0x314/0x638\nchrdev_open+0x1b8/0x258\ndo_dentry_open+0x2c4/0x700\nvfs_open+0x2c/0x3c\npath_openat+0xa64/0xc60\ndo_filp_open+0xb8/0x164\ndo_sys_openat2+0x84/0xf0\n__arm64_sys_openat+0x70/0x9c\ninvoke_syscall+0x58/0x114\nel0_svc_common+0x80/0xe0\ndo_el0_svc+0x1c/0x28\nel0_svc+0x38/0x68"], "name": "CVE-2024-56670", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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"}], "public_date": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56670\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56670\nhttps://lore.kernel.org/linux-cve-announce/2024122755-CVE-2024-56670-929d@gregkh/T"], "threat_severity": "Moderate"}

{}