218 lines
12 KiB
JSON
218 lines
12 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-2024-49864",
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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": "2024-10-21T12:17:06.017Z",
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"datePublished": "2024-10-21T18:01:07.874Z",
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"dateUpdated": "2026-08-05T11:40:12.232Z"
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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": "2026-08-05T11:40:12.232Z"
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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\nrxrpc: Fix a race between socket set up and I/O thread creation\n\nIn rxrpc_open_socket(), it sets up the socket and then sets up the I/O\nthread that will handle it. This is a problem, however, as there's a gap\nbetween the two phases in which a packet may come into rxrpc_encap_rcv()\nfrom the UDP packet but we oops when trying to wake the not-yet created I/O\nthread.\n\nAs a quick fix, just make rxrpc_encap_rcv() discard the packet if there's\nno I/O thread yet.\n\nA better, but more intrusive fix would perhaps be to rearrange things such\nthat the socket creation is done by the I/O thread."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The vulnerable code is the UDP encapsulation receive handler `rxrpc_encap_rcv()`, entered from the softirq packet-receive path for any datagram delivered to the rxrpc endpoint's UDP port (e.g. the well-known AFS port 7001 used by kafs). A remote host on the network triggers the oops simply by sending UDP packets to that port.\nAC:L - The race window is wide and deterministically traversed — it contains a `kthread_run()` plus a blocking `wait_for_completion()` — so a sustained UDP flood at the target port hits it without any timing precision, and a local attacker controls both sides outright by looping `bind()` on an AF_RXRPC socket while flooding that port on loopback. Repeatable success is expected.\nPR:N - The NULL dereference occurs before any rxrpc header parsing, service-ID matching, connection lookup or security-level check, so no credentials or prior authentication are needed; any unauthenticated packet reaching the port suffices. Even in the purely local variant, `rxrpc_create()` and `rxrpc_bind()` require no capability at all.\nUI:N - Exploitation needs only inbound packets during the endpoint-setup window; no action by any user of the target system is required beyond the normal, automatic creation of the rxrpc endpoint (module load, AFS mount, netns/container creation, service start).\nS:U - The dereference and its consequences are confined to the kernel of the affected host; no VM, IOMMU or other security-authority boundary is crossed.\nC:N - The bug is a dereference of a NULL `task_struct` pointer in `try_to_wake_up()`; no attacker-controlled memory is read back and no kernel data or pointers are disclosed to the attacker.\nI:N - No memory is written out of bounds and no freed object is reused — the fault is a read of the NULL page, giving the attacker no write or control-flow primitive.\nA:H - The NULL dereference happens in NET_RX softirq context, producing a fatal exception in interrupt context and a full kernel panic; it can be re-triggered on every reboot by keeping the UDP flood running against the endpoint's port."
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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/rxrpc/ar-internal.h",
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"net/rxrpc/io_thread.c",
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"net/rxrpc/local_object.c"
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],
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"versions": [
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"version": "a275da62e8c111b897b9cb73eb91df2f4e475ca5",
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"lessThan": "cdf4bbbdb956d7426f687f38757ebca2a2759a0f",
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"status": "affected",
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"versionType": "git"
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"lessThan": "56e415202b8a17de6496f4023e545fcb66f118ec",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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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/rxrpc/ar-internal.h",
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"net/rxrpc/io_thread.c",
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"net/rxrpc/local_object.c"
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],
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"versions": [
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{
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"version": "6.2",
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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": "6.2",
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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": "6.6.55",
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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": "6.10.14",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.3",
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"lessThanOrEqual": "6.11.*",
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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",
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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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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.6.55"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/cdf4bbbdb956d7426f687f38757ebca2a2759a0f"
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},
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{
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"url": "https://git.kernel.org/stable/c/56e415202b8a17de6496f4023e545fcb66f118ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/c64f5fc95e9612fdf75587c8e21e494e614c18e2"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc212465326e8587325f520a052346f0b57360e6"
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}
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],
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"title": "rxrpc: Fix a race between socket set up and I/O thread creation",
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"engine": "bippy-1.2.0"
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"adp": [
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{
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"metrics": [
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-49864",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-10-22T13:47:53.708864Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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