CVE-2022-49768

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"value": "AV:N - The recursive deadlock is reached from p9_read_work()/p9_poll_mux() on the TCP (and unix) fd transport when processing peer-driven I/O errors or malformed replies; a remote malicious 9p server can close the connection or send bad headers/tags over the established TCP session to enter p9_conn_cancel().\nAC:L - After a request is fully written the writer has already put its ref, leaving the waiting client with refcount 1; the remote peer can then deterministically force cancel (ECONNRESET, bad header, unexpected tag), so p9_client_cb()'s final p9_req_put() re-takes client->lock with no race outside attacker control.\nPR:N - The attacker is the remote 9p server and needs no credentials or capabilities on the client; reply/error handling on the transport runs without authentication or privilege checks, matching other trans_fd peer-driven 9p client bugs.\nUI:N - Exploitation rides an already-configured or automounted 9p TCP session and server-driven errors/replies; the mount is a deployment precondition, not a required victim action beyond ordinary use of that mount.\nS:U - Impact is a host-kernel deadlock inside the 9p client on the same OS security authority; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\nC:N - This is a pure recursive spinlock deadlock (p9_conn_cancel \u2192 p9_client_cb \u2192 p9_req_put \u2192 p9_tag_remove on the same client->lock); it does not free early, leak, or otherwise disclose kernel memory.\nI:N - There is no memory corruption, UAF, or write primitive\u2014only nested acquisition of the same non-recursive spinlock\u2014so control-flow hijack or arbitrary modification is not available.\nA:H - Re-taking client->lock while already holding it deadlocks the p9_read_work kworker with preemption disabled, hangs all further 9p operations on that client, and can soft-lockup the CPU; syzbot reported the recursive lock in p9_req_put from this path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", 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earlier."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: 9p: trans_fd/p9_conn_cancel: eliminar el bloqueo del cliente anteriormente. syzbot inform\u00f3 un bloqueo doble aqu\u00ed y ya no necesitamos este bloqueo despu\u00e9s de que las solicitudes se hayan movido a la lista local: simplemente elimine el bloqueo anteriormente."}], "id": "CVE-2022-49768", "lastModified": "2026-08-04T10:17:55.907", "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": "LOW", 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{"bugzilla": {"description": "kernel: 9p: trans_fd/p9_conn_cancel: drop client lock earlier", "id": "2363381", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363381"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-413", "details": ["In the Linux kernel, the following vulnerability has been resolved:\n9p: trans_fd/p9_conn_cancel: drop client lock earlier\nsyzbot reported a double-lock here and we no longer need this\nlock after requests have been moved off to local list:\njust drop the lock earlier."], "name": "CVE-2022-49768", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49768\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49768\nhttps://lore.kernel.org/linux-cve-announce/2025050114-CVE-2022-49768-d9af@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:45:29.086787+00:00", "updated": "2025-06-23T08:45:29.086838+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}