{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49149", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T01:49:39.274Z", "datePublished": "2025-02-26T01:55:16.371Z", "dateUpdated": "2026-08-05T08:54:04.806Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:54:04.806Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix call timer start racing with call destruction\n\nThe rxrpc_call struct has a timer used to handle various timed events\nrelating to a call. This timer can get started from the packet input\nroutines that are run in softirq mode with just the RCU read lock held.\nUnfortunately, because only the RCU read lock is held - and neither ref or\nother lock is taken - the call can start getting destroyed at the same time\na packet comes in addressed to that call. This causes the timer - which\nwas already stopped - to get restarted. Later, the timer dispatch code may\nthen oops if the timer got deallocated first.\n\nFix this by trying to take a ref on the rxrpc_call struct and, if\nsuccessful, passing that ref along to the timer. If the timer was already\nrunning, the ref is discarded.\n\nThe timer completion routine can then pass the ref along to the call's work\nitem when it queues it. If the timer or work item where already\nqueued/running, the extra ref is discarded." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable path is UDP RxRPC packet receive (rxrpc_input_packet → rxrpc_input_call_packet → rxrpc_reduce_call_timer). AFS opens a listening CM service socket over UDP, and AF_RXRPC processes call-bound packets from remote peers across the network.\nAC:L - A remote peer controls packet delivery that restarts the call timer and can force call teardown via ABORT/completion while flooding late packets, so the attacker drives both sides of the destruction-vs-timer race rather than relying on an uncontrollable condition.\nPR:N - Packet processing runs in softirq with only RCU; no local credentials are required. On an AFS/RxRPC endpoint, an unauthenticated or already-peered remote sender can address packets to an in-flight call without privileges on the victim host.\nUI:N - Once AF_RXRPC/AFS is active, exploitation is driven solely by received UDP packets and concurrent call teardown; no user mount, open, or other interactive action is required.\nS:U - Impact is confined to the host kernel’s RxRPC call object lifetime (timer UAF/oops); this is not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - The race restarts an embedded timer on an rxrpc_call that can then be freed, yielding a use-after-free that can be reused via heap spraying for arbitrary kernel memory disclosure.\nI:H - The same timer-vs-destruction UAF on the freed rxrpc_call enables heap reuse and control-flow/integrity compromise, not merely a clean failure path.\nA:H - The commit reports that the timer dispatch path can oops after the call (and its embedded timer) is deallocated; any such UAF also reliably crashes or hangs the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/trace/events/rxrpc.h", "net/rxrpc/ar-internal.h", "net/rxrpc/call_event.c", "net/rxrpc/call_object.c" ], "versions": [ { "version": "a158bdd3247b9656df36ba133235fff702e9fdc3", "lessThan": "051360e51341cd17738d82c15a8226010c7cb7f6", "status": "affected", "versionType": "git" }, { "version": "a158bdd3247b9656df36ba133235fff702e9fdc3", "lessThan": "8cbf4ae7a2833767d63114573e5f9a45740cc975", "status": "affected", "versionType": "git" }, { "version": "a158bdd3247b9656df36ba133235fff702e9fdc3", "lessThan": "54df5a37f1d951ed27fd47bf9b15a42279582110", "status": "affected", "versionType": "git" }, { "version": "a158bdd3247b9656df36ba133235fff702e9fdc3", "lessThan": "5e3c11144e557a9dbf9a2f6abe444689ef9d8aae", "status": "affected", "versionType": "git" }, { "version": "a158bdd3247b9656df36ba133235fff702e9fdc3", "lessThan": "4a7f62f91933c8ae5308f9127fd8ea48188b6bc3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/trace/events/rxrpc.h", "net/rxrpc/ar-internal.h", "net/rxrpc/call_event.c", "net/rxrpc/call_object.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.110", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.33", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.19", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.2", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18", "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": "4.15", "versionEndExcluding": "5.10.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.15.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.16.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.17.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/051360e51341cd17738d82c15a8226010c7cb7f6" }, { "url": "https://git.kernel.org/stable/c/8cbf4ae7a2833767d63114573e5f9a45740cc975" }, { "url": "https://git.kernel.org/stable/c/54df5a37f1d951ed27fd47bf9b15a42279582110" }, { "url": "https://git.kernel.org/stable/c/5e3c11144e557a9dbf9a2f6abe444689ef9d8aae" }, { "url": "https://git.kernel.org/stable/c/4a7f62f91933c8ae5308f9127fd8ea48188b6bc3" } ], "title": "rxrpc: Fix call timer start racing with call destruction", "x_generator": { "engine": "bippy-1.2.0" } } } }