248 lines
13 KiB
JSON
248 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98764",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.368Z",
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"datePublished": "2026-10-18T15:47:56.225Z",
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"dateUpdated": "2026-10-30T12:39:33.311Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:39:33.311Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix NULL pointer dereference in FUNCTIONFS_ENDPOINT_DESC\n\nWhen user space sets up FunctionFS with only full-speed descriptors\n(e.g., flags = FUNCTIONFS_HAS_FS_DESC) and the gadget operates at a\nhigher speed (such as USB_SPEED_HIGH or USB_SPEED_SUPER),\nconfig_ep_by_speed() detects that the function lacks descriptors for\nthe current speed, logs a warning, and falls back to full-speed\ndescriptors. The endpoint is then successfully enabled via\nusb_ep_enable(), and epfile->ep becomes valid.\n\nHowever, when user space subsequently issues the FUNCTIONFS_ENDPOINT_DESC\nioctl to query the endpoint descriptor, ffs_epfile_ioctl() selects the\ndescriptor index solely based on gadget->speed:\n\n\tswitch (epfile->ffs->gadget->speed) {\n\tcase USB_SPEED_SUPER:\n\tcase USB_SPEED_SUPER_PLUS:\n\t\tdesc_idx = 2;\n\t\tbreak;\n\tcase USB_SPEED_HIGH:\n\t\tdesc_idx = 1;\n\t\tbreak;\n\tdefault:\n\t\tdesc_idx = 0;\n\t}\n\tdesc = epfile->ep->descs[desc_idx];\n\tmemcpy(&desc1, desc, desc->bLength);\n\nBecause user space only supplied full-speed descriptors,\nepfile->ep->descs[1] is NULL. Dereferencing desc->bLength triggers an\nimmediate kernel NULL pointer dereference panic.\n\nFix this by falling back through lower speed descriptors if the current\nspeed descriptor was not supplied, matching the fallback logic in\nconfig_ep_by_speed() and historical f_fs behavior. If still missing,\nfall back to epfile->ep->ep->desc (the active descriptor), and return\n-EINVAL safely if no valid descriptor is found. In addition, mark desc\nas const to match struct usb_ep::desc and avoid discarding qualifiers."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/function/f_fs.c"
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],
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"versions": [
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "c5f452e057df6ef89300523d13ad6833bfd199cd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "e5b9d6bb2a8906a1188c9a90cc8d102de3f07cad",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "7ef0ad5f462fa95bc4c6647d097d7c0384245b9c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "06ac8609d6d185ac18c1d6a6a8a9b99e398bd124",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "7811d8e26c77f8eea79e22d0d14c67ec0658b348",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "35ab269602e1f7c4c0fe6ea3477264bea77eced3",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "c559a353410939c0884e83bdb0e2420a986ac53b",
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"lessThan": "9cd072788c76595529eb38f42bf94d23852f8534",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/function/f_fs.c"
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],
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"versions": [
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{
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"version": "3.18",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.18",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.113",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.56",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.10",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "5.10.273"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "5.15.224"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.6.160"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.12.113"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "6.18.56"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "7.2.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.18",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c5f452e057df6ef89300523d13ad6833bfd199cd"
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},
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{
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"url": "https://git.kernel.org/stable/c/e5b9d6bb2a8906a1188c9a90cc8d102de3f07cad"
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},
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{
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"url": "https://git.kernel.org/stable/c/7ef0ad5f462fa95bc4c6647d097d7c0384245b9c"
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},
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{
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"url": "https://git.kernel.org/stable/c/06ac8609d6d185ac18c1d6a6a8a9b99e398bd124"
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},
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{
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"url": "https://git.kernel.org/stable/c/9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3"
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},
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{
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"url": "https://git.kernel.org/stable/c/7811d8e26c77f8eea79e22d0d14c67ec0658b348"
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},
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{
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"url": "https://git.kernel.org/stable/c/35ab269602e1f7c4c0fe6ea3477264bea77eced3"
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},
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{
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"url": "https://git.kernel.org/stable/c/9cd072788c76595529eb38f42bf94d23852f8534"
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}
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],
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"title": "usb: gadget: f_fs: Fix NULL pointer dereference in FUNCTIONFS_ENDPOINT_DESC",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |