180 lines
10 KiB
JSON
180 lines
10 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-2026-64265",
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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": "2026-07-19T15:36:31.774Z",
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"datePublished": "2026-07-25T08:49:14.548Z",
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"dateUpdated": "2026-08-17T04:52:19.015Z"
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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": "2026-08-17T04:52:19.015Z"
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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: clear intr_entry in fuse_resend and fuse_remove_pending_req\n\nWhen fuse_resend() moves a request from fpq->processing back to\nfiq->pending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq->interrupts. If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq->interrupts. When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq->pending and frees it\nvia the refcount path, also without cleaning intr_entry. The\nstale intr_entry causes use-after-free when fuse_read_interrupt()\niterates fiq->interrupts:\n - list_del_init(&req->intr_entry) -> UAF write on freed slab\n - req->in.h.unique -> UAF read, data leaked to userspace\n\nRemove intr_entry from fiq->interrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq->pending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction."
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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 - The vulnerability is reached through local filesystem, signal, and read/write syscalls involving an attached /dev/fuse descriptor. No network or physical input directly reaches the vulnerable functions.\nAC:L - A malicious FUSE daemon can deterministically withhold a request, signal its client, issue FUSE_NOTIFY_RESEND, deliver a fatal signal, and read the stale interrupt. Polling permits synchronization without depending on an uncontrollable race.\nPR:L - Normal FUSE supports user-namespace and non-privileged mounts, while opening the FUSE device has no kernel capability check. An ordinary user can control both the daemon and client processes in a reasonable deployment.\nUI:N - All triggering operations can be performed programmatically by attacker-controlled daemon and client processes. No separate victim must mount or access the filesystem.\nS:U - Exploitation compromises the same kernel security authority in which the vulnerable FUSE code executes. This is a standard local kernel privilege escalation rather than a guest-to-host boundary escape.\nC:H - fuse_read_interrupt() reads req->in.h.unique from freed slab memory and copies it to userspace. Slab reuse or cache merging can expose replacement-object contents through this UAF read.\nI:H - list_del_init() interprets freed or reused intr_entry pointers as live list links and writes through them as well as into the freed object. Heap grooming can leverage this memory corruption for arbitrary writes or control-flow compromise.\nA:H - The stale list pointers and UAF writes can corrupt kernel queues or slab objects and cause an oops or panic. The attacker can repeat the deterministic trigger sequence."
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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.c"
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],
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"versions": [
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{
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"version": "760eac73f9f69aa28fcb3050b4946c2dcc656d12",
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"lessThan": "1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c",
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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": "760eac73f9f69aa28fcb3050b4946c2dcc656d12",
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"lessThan": "7366e6f4d2b4c7002b13fb01219e83679dad4127",
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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": "760eac73f9f69aa28fcb3050b4946c2dcc656d12",
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"lessThan": "893479015cb6442fd389d3b553ab3036c9541715",
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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": "760eac73f9f69aa28fcb3050b4946c2dcc656d12",
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"lessThan": "f8fce75fedf73ac72aa09163deb8f4291fdcaad2",
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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.c"
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],
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"versions": [
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{
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"version": "6.9",
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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": "6.9",
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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": "6.12.96",
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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": "6.18.39",
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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": "6.9",
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"versionEndExcluding": "6.12.96"
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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": "6.9",
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"versionEndExcluding": "6.18.39"
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},
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.9",
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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": "6.9",
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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/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c"
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},
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{
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"url": "https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127"
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},
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{
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"url": "https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715"
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},
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{
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"url": "https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2"
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}
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],
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"title": "fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |