159 lines
9.1 KiB
JSON
159 lines
9.1 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-2026-68387",
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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": "2026-07-30T09:28:09.388Z",
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"datePublished": "2026-08-10T12:04:06.326Z",
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"dateUpdated": "2026-08-17T05:04:34.632Z"
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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": "2026-08-17T05:04:34.632Z"
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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\ncan: raw: add locking for raw flags bitfield\n\nWith commit 890e5198a6e5 (\"can: raw: use bitfields to store flags in\nstruct raw_sock\") the formerly separate integer values have been integrated\ninto a single bitfield. This led to a read-modify-write operation when\nchanging a flag in raw_setsockopt() which now needs a locking to prevent\nconcurrent access.\n\nInstead of adding a lock/unlock hell in each of the flag manipulations this\npatch introduces a wrapper for a new raw_setsockopt_locked() function\nanalogue to the isotp_setsockopt[_locked]() approach in net/can/isotp.c\n\n[mkl: use Closes tag instead of Link]"
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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 race is driven entirely through local syscalls on an AF_CAN/CAN_RAW socket — one thread calling bind() while another calls setsockopt(SOL_CAN_RAW, CAN_RAW_LOOPBACK). No network packet is needed to trigger the corruption, so the attack vector is local.\nAC:L - The attacker controls both sides of the race, holding the same fd and issuing concurrent bind()/setsockopt() from two threads it pins itself, and can loop the attempt indefinitely until the unlocked read-modify-write on the shared bitfield word loses the update to ro->bound. No condition lies outside attacker control.\nPR:L - can_create() and raw_proto impose no capability check, so any unprivileged local user can open a CAN_RAW socket; a user namespace (unshare -Urn) additionally lets an unprivileged attacker create a vcan device to bind to, so only basic local user access is required.\nUI:N - The attacker performs every step itself — creating the socket, binding, and racing setsockopt — with no victim action or cooperation needed at any point.\nS:U - The corruption stays within the kernel's own memory and security authority, giving standard local privilege escalation rather than crossing a VM, IOMMU, or sandbox boundary.\nC:H - Losing the ro->bound update makes raw_release() skip raw_disable_allfilters(), leaving a receiver entry holding a raw sk pointer that can_rx_register() never refcounted; later frames drive raw_rcv() to read fd_frames, xl_frames, raw_vcid_opts and count out of freed memory, and the resulting UAF lets an attacker groom the freed slab to disclose kernel memory.\nI:H - The same dangling socket gives write primitives: raw_rcv() writes through this_cpu_ptr(ro->uniq) into already free_percpu'd memory and calls sock_queue_rcv_skb() on the freed sock, so a heap-sprayed replacement object yields attacker-influenced writes and control-flow hijack potential.\nA:H - The use-after-free reliably oopses or panics the kernel when CAN frames hit the stale receiver entry, and the clobber also skips netdev_put() (leaking a device reference that hangs unregistration) and can drive can_rx_unregister() into its \"receive list entry not found\" error path."
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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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"net/can/raw.c"
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],
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"versions": [
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{
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"version": "890e5198a6e5b238627c245fafea1a92670a86cd",
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"lessThan": "00ba4bf8798242253fefc1fa6a78db1d445fd024",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "57791aab1129c9405f84bb0882de58967d8b44cd",
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"status": "affected",
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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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"net/can/raw.c"
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],
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"versions": [
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{
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"version": "6.18",
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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": "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": "6.18.42",
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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": "7.1.6",
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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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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.18.42"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/00ba4bf8798242253fefc1fa6a78db1d445fd024"
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},
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{
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"url": "https://git.kernel.org/stable/c/57791aab1129c9405f84bb0882de58967d8b44cd"
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},
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{
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"url": "https://git.kernel.org/stable/c/1e5185c090589f4146d728ab36417d8a5419f127"
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}
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],
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"title": "can: raw: add locking for raw flags bitfield",
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