359 lines
18 KiB
JSON
359 lines
18 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-2026-31532",
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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": "2026-03-09T15:48:24.112Z",
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"datePublished": "2026-04-23T11:12:44.829Z",
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"dateUpdated": "2026-10-19T18:45:55.225Z"
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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": "2026-08-05T12:23:19.603Z"
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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: fix ro->uniq use-after-free in raw_rcv()\n\nraw_release() unregisters raw CAN receive filters via can_rx_unregister(),\nbut receiver deletion is deferred with call_rcu(). This leaves a window\nwhere raw_rcv() may still be running in an RCU read-side critical section\nafter raw_release() frees ro->uniq, leading to a use-after-free of the\npercpu uniq storage.\n\nMove free_percpu(ro->uniq) out of raw_release() and into a raw-specific\nsocket destructor. can_rx_unregister() takes an extra reference to the\nsocket and only drops it from the RCU callback, so freeing uniq from\nsk_destruct ensures the percpu area is not released until the relevant\ncallbacks have drained.\n\n[mkl: applied manually]"
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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 - Exploitation requires local access to create/bind/close CAN_RAW sockets and race them with CAN frame delivery into raw_rcv(). Received CAN frames can trigger the vulnerable callback, but the attacker-controlled setup and free path are local socket operations.\nAC:L - The race is between attacker-controlled socket teardown/filter unregistration and attacker-controlled CAN frame generation, for example using concurrent local sockets and loopback/vcan or an existing CAN interface. No unusual external condition is required beyond timing that can be retried.\nPR:L - CAN_RAW socket creation, bind, setsockopt, send, and close in this path do not impose a CAP_NET_RAW or CAP_NET_ADMIN check for an existing CAN device. If a virtual CAN device must be created, CAP_NET_ADMIN in a user namespace may suffice, so this is still not real init-namespace root.\nUI:N - No victim action is required once the attacker can run local code. The attacker can create the sockets, register filters, generate frames, and close sockets themselves.\nS:U - The vulnerable object and resulting corruption are within the kernel networking/CAN security authority. This is a standard kernel memory corruption issue, not a cross-VM or hardware boundary escape.\nC:H - This is a use-after-free of per-CPU storage accessed from raw_rcv(), and the freed area may be reallocated before the callback reads it. Per the kernel scoring guidance, UAF memory corruption is treated as enabling high confidentiality impact.\nI:H - raw_rcv() writes skb pointers, hashes, and counters through the freed ro->uniq pointer, corrupting whatever per-CPU object reuses that storage. As a UAF with kernel memory corruption, it is defensibly scored as high integrity impact.\nA:H - The stale per-CPU pointer can lead to invalid memory accesses or corruption during softirq CAN receive processing. A kernel oops/panic is a direct plausible outcome."
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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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"lessThanOrEqual": "6.6.*",
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},
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{
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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{
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"version": "7.1",
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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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"title": "can: raw: fix ro->uniq use-after-free in raw_rcv()",
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"id": "CVE-2026-31532",
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"role": "CISA Coordinator",
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"options": [
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{
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}
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