{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-49864", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.017Z", "datePublished": "2024-10-21T18:01:07.874Z", "dateUpdated": "2026-08-05T11:40:12.232Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:40:12.232Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rxrpc/ar-internal.h", "net/rxrpc/io_thread.c", "net/rxrpc/local_object.c" ], "versions": [ { "version": "a275da62e8c111b897b9cb73eb91df2f4e475ca5", "lessThan": "cdf4bbbdb956d7426f687f38757ebca2a2759a0f", "status": "affected", "versionType": "git" }, { "version": "a275da62e8c111b897b9cb73eb91df2f4e475ca5", "lessThan": "56e415202b8a17de6496f4023e545fcb66f118ec", "status": "affected", "versionType": "git" }, { "version": "a275da62e8c111b897b9cb73eb91df2f4e475ca5", "lessThan": "c64f5fc95e9612fdf75587c8e21e494e614c18e2", "status": "affected", "versionType": "git" }, { "version": "a275da62e8c111b897b9cb73eb91df2f4e475ca5", "lessThan": "bc212465326e8587325f520a052346f0b57360e6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/rxrpc/ar-internal.h", "net/rxrpc/io_thread.c", "net/rxrpc/local_object.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.55", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.10.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.11.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cdf4bbbdb956d7426f687f38757ebca2a2759a0f" }, { "url": "https://git.kernel.org/stable/c/56e415202b8a17de6496f4023e545fcb66f118ec" }, { "url": "https://git.kernel.org/stable/c/c64f5fc95e9612fdf75587c8e21e494e614c18e2" }, { "url": "https://git.kernel.org/stable/c/bc212465326e8587325f520a052346f0b57360e6" } ], "title": "rxrpc: Fix a race between socket set up and I/O thread creation", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-49864", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-22T13:47:53.708864Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:48:52.920Z" } } ] } }