159 lines
8.6 KiB
JSON
159 lines
8.6 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-2026-64259",
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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": "2026-07-19T15:36:31.773Z",
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"datePublished": "2026-07-25T08:49:10.756Z",
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"dateUpdated": "2026-08-17T04:52:12.445Z"
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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": "2026-08-17T04:52:12.445Z"
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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\nfuse-uring: make a fuse_req on SQE commit only findable after memcpy\n\nBad userspace might try to trick us and send commit SQEs request\nunique / commit-id of requests that are not even send to\nfuse-server (io_uring_cmd_done() not called) yet.\n\nfuse_uring_commit_fetch() ends the fuse request when the ring entry\nhas a wrong state, but that could have caused a use-after-free\nwith the memcpy operations in fuse_uring_send_in_task().\nIn order to avoid such races the call of fuse_uring_add_to_pq()\nis moved after the copy operations and just before completing\nthe io-uring request - malicious userspace cannot find the request\nanymore until all prepration work in fuse-client/kernel is completed.\n\nThis also moves fuse_uring_add_to_pq() a bit up in the code to\navoid a forward declaration. Also not with a preparation commit,\nto make it easier to back port to older kernels."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Triggering requires local filesystem operations and IORING_OP_URING_CMD submissions on an associated /dev/fuse descriptor. Network peers cannot directly reach this commit path.\nAC:L - The attacker controls request generation, predictable sequential commit IDs, concurrent commit submission, and deferred io_uring task-work execution. Both sides of the race are attacker-controlled.\nPR:L - An ordinary user can create and operate a FUSE mount through fusermount or CAP_SYS_ADMIN in a user namespace; FUSE permits user-namespace mounts and this path has no init-namespace capability check.\nUI:N - The attacker can operate both the FUSE daemon and a client thread that generates requests, requiring no victim action.\nS:U - Exploitation compromises the host kernel within the same security authority and does not cross a VM, IOMMU, or comparable boundary.\nC:H - The freed request's argument pointers and copy sources are dereferenced while copying into attacker-controlled ring memory. Heap reclamation can therefore expose sensitive kernel memory.\nI:H - The use-after-free performs writes to reclaimed request memory through embedded spinlocks and request flags, providing exploitable heap corruption that may enable arbitrary writes or kernel code execution.\nA:H - The dangling request can cause invalid dereferences, corrupted request state, double completion, hangs, or a kernel panic."
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}
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]
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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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"fs/fuse/dev_uring.c"
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],
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"versions": [
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{
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"version": "c090c8abae4b6b77a1bee116aa6c385456ebef96",
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"lessThan": "e1711479e9068ea31b31353a702a51e639c3d059",
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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": "c090c8abae4b6b77a1bee116aa6c385456ebef96",
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"lessThan": "a635f427d57e2012102ae4886b48d8955c59fb86",
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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": "c090c8abae4b6b77a1bee116aa6c385456ebef96",
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"lessThan": "1efd3d474fc0ba74dfd984249bca78807d739812",
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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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"fs/fuse/dev_uring.c"
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],
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"versions": [
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{
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"version": "6.14",
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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": "6.14",
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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": "6.18.39",
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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": "7.1.4",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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": "6.14",
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"versionEndExcluding": "6.18.39"
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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": "6.14",
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"versionEndExcluding": "7.1.4"
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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": "6.14",
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"versionEndExcluding": "7.2"
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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/e1711479e9068ea31b31353a702a51e639c3d059"
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},
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{
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"url": "https://git.kernel.org/stable/c/a635f427d57e2012102ae4886b48d8955c59fb86"
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},
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{
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"url": "https://git.kernel.org/stable/c/1efd3d474fc0ba74dfd984249bca78807d739812"
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}
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],
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"title": "fuse-uring: make a fuse_req on SQE commit only findable after memcpy",
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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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} |