CVE-2024-49864

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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 \u2014 it contains a `kthread_run()` plus a blocking `wait_for_completion()` \u2014 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 \u2014 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"}}]}}

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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 \u2014 it contains a `kthread_run()` plus a blocking `wait_for_completion()` \u2014 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. 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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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rxrpc: Corrige una ejecuci\u00f3n entre la configuraci\u00f3n del socket y la creaci\u00f3n del hilo de E/S En rxrpc_open_socket(), configura el socket y luego configura el hilo de E/S que lo manejar\u00e1. Sin embargo, esto es un problema, ya que hay una brecha entre las dos fases en las que un paquete puede llegar a rxrpc_encap_rcv() desde el paquete UDP, pero fallo al intentar despertar el hilo de E/S a\u00fan no creado. Como soluci\u00f3n r\u00e1pida, simplemente haga que rxrpc_encap_rcv() descarte el paquete si a\u00fan no hay un hilo de E/S. Una soluci\u00f3n mejor, pero m\u00e1s intrusiva, tal vez ser\u00eda reorganizar las cosas de modo que la creaci\u00f3n del socket la realice el hilo de E/S."}], "id": "CVE-2024-49864", "lastModified": "2026-08-04T11:20:53.083", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-49864", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:47:53.708864Z", "version": "2.0.3"}}]}, "published": "2024-10-21T18:15:06.203", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56e415202b8a17de6496f4023e545fcb66f118ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bc212465326e8587325f520a052346f0b57360e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c64f5fc95e9612fdf75587c8e21e494e614c18e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cdf4bbbdb956d7426f687f38757ebca2a2759a0f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: rxrpc: Fix a race between socket set up and I/O thread creation", "id": "2320455", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320455"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nrxrpc: Fix a race between socket set up and I/O thread creation\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.\nAs a quick fix, just make rxrpc_encap_rcv() discard the packet if there's\nno I/O thread yet.\nA better, but more intrusive fix would perhaps be to rearrange things such\nthat the socket creation is done by the I/O thread."], "name": "CVE-2024-49864", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49864\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49864\nhttps://lore.kernel.org/linux-cve-announce/2024102113-CVE-2024-49864-5158@gregkh/T"], "threat_severity": "Moderate"}

{}