{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-52894", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52894", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2024-08-21T06:10:34.120Z", "updatedAt": "2026-05-11T19:35:02.622Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()\n\nIn Google internal bug 265639009 we've received an (as yet) unreproducible\ncrash report from an aarch64 GKI 5.10.149-android13 running device.\n\nAFAICT the source code is at:\n https://android.googlesource.com/kernel/common/+/refs/tags/ASB-2022-12-05_13-5.10\n\nThe call stack is:\n ncm_close() -> ncm_notify() -> ncm_do_notify()\nwith the crash at:\n ncm_do_notify+0x98/0x270\nCode: 79000d0b b9000a6c f940012a f9400269 (b9405d4b)\n\nWhich I believe disassembles to (I don't know ARM assembly, but it looks sane enough to me...):\n\n // halfword (16-bit) store presumably to event->wLength (at offset 6 of struct usb_cdc_notification)\n 0B 0D 00 79 strh w11, [x8, #6]\n\n // word (32-bit) store presumably to req->Length (at offset 8 of struct usb_request)\n 6C 0A 00 B9 str w12, [x19, #8]\n\n // x10 (NULL) was read here from offset 0 of valid pointer x9\n // IMHO we're reading 'cdev->gadget' and getting NULL\n // gadget is indeed at offset 0 of struct usb_composite_dev\n 2A 01 40 F9 ldr x10, [x9]\n\n // loading req->buf pointer, which is at offset 0 of struct usb_request\n 69 02 40 F9 ldr x9, [x19]\n\n // x10 is null, crash, appears to be attempt to read cdev->gadget->max_speed\n 4B 5D 40 B9 ldr w11, [x10, #0x5c]\n\nwhich seems to line up with ncm_do_notify() case NCM_NOTIFY_SPEED code fragment:\n\n event->wLength = cpu_to_le16(8);\n req->length = NCM_STATUS_BYTECOUNT;\n\n /* SPEED_CHANGE data is up/down speeds in bits/sec */\n data = req->buf + sizeof *event;\n data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));\n\nMy analysis of registers and NULL ptr deref crash offset\n (Unable to handle kernel NULL pointer dereference at virtual address 000000000000005c)\nheavily suggests that the crash is due to 'cdev->gadget' being NULL when executing:\n data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));\nwhich calls:\n ncm_bitrate(NULL)\nwhich then calls:\n gadget_is_superspeed(NULL)\nwhich reads\n ((struct usb_gadget *)NULL)->max_speed\nand hits a panic.\n\nAFAICT, if I'm counting right, the offset of max_speed is indeed 0x5C.\n(remember there's a GKI KABI reservation of 16 bytes in struct work_struct)\n\nIt's not at all clear to me how this is all supposed to work...\nbut returning 0 seems much better than panic-ing...", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "fef6b29671b66dfb71f17e337c1ad14b5a2cedae" }, { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "63d161f29cd39c050e8873aa36e0c9fc013bb763" }, { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "a21da7f7aae618c785f7e4a275d43c06dc8412b6" }, { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "e92c70059178da751e5af7de02384b7dfadb5ec7" }, { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "a69c8dfb85b44be9cc223be07d35cc3a9baefbea" }, { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "09e4507ec8ef2d44da6ba4092b8ee2d81f216497" }, { "version": "1650113888fe7b7e16604a5019c32dd3ddeb3af2", "status": "affected", "versionType": "git", "lessThan": "c6ec929595c7443250b2a4faea988c62019d5cd2" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.9" }, { "version": "4.14.304", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.271", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.230", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.165", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.90", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }