CVE-2026-52947

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It exposes a race\nwindow where a concurrent RCU reader (such as qrtr_reset_ports() or\nqrtr_port_lookup()) can obtain a pointer to the socket from the XArray,\nand attempt to call sock_hold() on a socket whose reference count has\nalready dropped to zero.\n\nThis exact race condition was hit during syzkaller fuzzing, leading to\nthe following refcount saturation warning and a potential Use-After-Free:\n\n refcount_t: saturated; leaking memory.\n WARNING: CPU: 3 PID: 1273 at lib/refcount.c:22 refcount_warn_saturate+0xae/0x1d0\n Modules linked in: qrtr(+) bochs drm_shmem_helper ...\n Call Trace:\n <TASK>\n qrtr_reset_ports net/qrtr/af_qrtr.c:768 [inline] [qrtr]\n __qrtr_bind.isra.0+0x48b/0x570 net/qrtr/af_qrtr.c:805 [qrtr]\n qrtr_bind+0x17d/0x210 net/qrtr/af_qrtr.c:901 [qrtr]\n kernel_bind+0xe4/0x120 net/socket.c:3592\n qrtr_ns_init+0x1a6/0x380 net/qrtr/ns.c:715 [qrtr]\n qrtr_proto_init+0x3b/0xff0 net/qrtr/af_qrtr.c:169 [qrtr]\n do_one_initcall+0xf5/0x5e0 init/main.c:1283\n ...\n </TASK>\n\nFix this by deferring the reference count decrement until after the\nxa_erase() and the synchronize_rcu() complete.\n\n(Note: The v1 of this patch incorrectly replaced __sock_put() with\nsock_put(). As Simon Horman pointed out, the callers of qrtr_port_remove()\nstill hold a reference to the socket, so freeing the socket memory here\nwould lead to a subsequent UAF in the caller. Thus, the __sock_put() is\nkept, but only repositioned to close the RCU race.)"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reachable through local AF_QIPCRTR datagram sockets via bind/autobind, sendmsg lookup, rebind, and close/release; QRTR transports are local IPC/internal device transports rather than Internet-facing network services. A local unprivileged process on a QRTR-enabled system can create and race these sockets.\nAC:L - Although this is a race, the attacker can control both sides by repeatedly removing bound QRTR ports while concurrently causing QRTR port lookups through local sends or other QRTR activity. Syzkaller reached the race, and there are no special external conditions beyond attacker-driven concurrency.\nPR:L - Creating AF_QIPCRTR sockets and binding ephemeral or high-numbered QRTR ports does not require CAP_NET_ADMIN or root. Control-port binding has extra checks, but exploitation does not depend on becoming the controller.\nUI:N - No victim action is required once the attacker has local code execution. The attacker can create sockets, bind/send/close them, and run the race directly.\nS:U - The corruption is within the kernel networking/QRTR subsystem and does not cross a separate security authority such as a VM, IOMMU, or sandbox boundary. A local kernel compromise remains unchanged scope.\nC:H - The bug is a potential use-after-free of a QRTR socket object reachable through stale XArray/RCU lookups and refcount resurrection. Per kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - A UAF on a kernel socket object can potentially be shaped with heap spraying into write or control-flow primitives. When uncertain, this should be scored as high integrity impact rather than only a crash.\nA:H - The observed failure is a refcount saturation warning on a stale socket reference, and the underlying UAF can lead to kernel oops, panic, or memory corruption. This is high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/qrtr/af_qrtr.c"], "versions": [{"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "2aa4c12723fe432e623462a3be42a197a128722b", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "03bfa95e452e2b6ccd76a332060ae4feaf5ad84d", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "474293d90880622fde9d2430fb0165767090f7b3", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "2047c2aa0963bb2872fd722300a15bcb441a4c00", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "7de2d447072be3b1a76793f034432338fc9c494b", 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"https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b"}, {"url": "https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d"}, {"url": "https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3"}, {"url": "https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00"}, {"url": "https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b"}, {"url": "https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da"}, {"url": "https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df"}, {"url": "https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5"}], "title": "net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:22:03.593Z"}, "affected": 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It exposes a race\nwindow where a concurrent RCU reader (such as qrtr_reset_ports() or\nqrtr_port_lookup()) can obtain a pointer to the socket from the XArray,\nand attempt to call sock_hold() on a socket whose reference count has\nalready dropped to zero.\n\nThis exact race condition was hit during syzkaller fuzzing, leading to\nthe following refcount saturation warning and a potential Use-After-Free:\n\n refcount_t: saturated; leaking memory.\n WARNING: CPU: 3 PID: 1273 at lib/refcount.c:22 refcount_warn_saturate+0xae/0x1d0\n Modules linked in: qrtr(+) bochs drm_shmem_helper ...\n Call Trace:\n <TASK>\n qrtr_reset_ports net/qrtr/af_qrtr.c:768 [inline] [qrtr]\n __qrtr_bind.isra.0+0x48b/0x570 net/qrtr/af_qrtr.c:805 [qrtr]\n qrtr_bind+0x17d/0x210 net/qrtr/af_qrtr.c:901 [qrtr]\n kernel_bind+0xe4/0x120 net/socket.c:3592\n qrtr_ns_init+0x1a6/0x380 net/qrtr/ns.c:715 [qrtr]\n qrtr_proto_init+0x3b/0xff0 net/qrtr/af_qrtr.c:169 [qrtr]\n do_one_initcall+0xf5/0x5e0 init/main.c:1283\n ...\n </TASK>\n\nFix this by deferring the reference count decrement until after the\nxa_erase() and the synchronize_rcu() complete.\n\n(Note: The v1 of this patch incorrectly replaced __sock_put() with\nsock_put(). As Simon Horman pointed out, the callers of qrtr_port_remove()\nstill hold a reference to the socket, so freeing the socket memory here\nwould lead to a subsequent UAF in the caller. Thus, the __sock_put() is\nkept, but only repositioned to close the RCU race.)"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable path is reachable through local AF_QIPCRTR datagram sockets via bind/autobind, sendmsg lookup, rebind, and close/release; QRTR transports are local IPC/internal device transports rather than Internet-facing network services. A local unprivileged process on a QRTR-enabled system can create and race these sockets.\nAC:L - Although this is a race, the attacker can control both sides by repeatedly removing bound QRTR ports while concurrently causing QRTR port lookups through local sends or other QRTR activity. Syzkaller reached the race, and there are no special external conditions beyond attacker-driven concurrency.\nPR:L - Creating AF_QIPCRTR sockets and binding ephemeral or high-numbered QRTR ports does not require CAP_NET_ADMIN or root. Control-port binding has extra checks, but exploitation does not depend on becoming the controller.\nUI:N - No victim action is required once the attacker has local code execution. The attacker can create sockets, bind/send/close them, and run the race directly.\nS:U - The corruption is within the kernel networking/QRTR subsystem and does not cross a separate security authority such as a VM, IOMMU, or sandbox boundary. A local kernel compromise remains unchanged scope.\nC:H - The bug is a potential use-after-free of a QRTR socket object reachable through stale XArray/RCU lookups and refcount resurrection. Per kernel scoring guidance, UAF memory corruption can be leveraged for high-impact information disclosure.\nI:H - A UAF on a kernel socket object can potentially be shaped with heap spraying into write or control-flow primitives. When uncertain, this should be scored as high integrity impact rather than only a crash.\nA:H - The observed failure is a refcount saturation warning on a stale socket reference, and the underlying UAF can lead to kernel oops, panic, or memory corruption. This is high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/qrtr/af_qrtr.c"], "versions": [{"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "2aa4c12723fe432e623462a3be42a197a128722b", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "03bfa95e452e2b6ccd76a332060ae4feaf5ad84d", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "474293d90880622fde9d2430fb0165767090f7b3", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "2047c2aa0963bb2872fd722300a15bcb441a4c00", "status": "affected", "versionType": "git"}, {"version": "bdabad3e363d825ddf9679dd431cca0b2c30f881", "lessThan": "7de2d447072be3b1a76793f034432338fc9c494b", 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It exposes a race\nwindow where a concurrent RCU reader (such as qrtr_reset_ports() or\nqrtr_port_lookup()) can obtain a pointer to the socket from the XArray,\nand attempt to call sock_hold() on a socket whose reference count has\nalready dropped to zero.\n\nThis exact race condition was hit during syzkaller fuzzing, leading to\nthe following refcount saturation warning and a potential Use-After-Free:\n\n refcount_t: saturated; leaking memory.\n WARNING: CPU: 3 PID: 1273 at lib/refcount.c:22 refcount_warn_saturate+0xae/0x1d0\n Modules linked in: qrtr(+) bochs drm_shmem_helper ...\n Call Trace:\n <TASK>\n qrtr_reset_ports net/qrtr/af_qrtr.c:768 [inline] [qrtr]\n __qrtr_bind.isra.0+0x48b/0x570 net/qrtr/af_qrtr.c:805 [qrtr]\n qrtr_bind+0x17d/0x210 net/qrtr/af_qrtr.c:901 [qrtr]\n kernel_bind+0xe4/0x120 net/socket.c:3592\n qrtr_ns_init+0x1a6/0x380 net/qrtr/ns.c:715 [qrtr]\n qrtr_proto_init+0x3b/0xff0 net/qrtr/af_qrtr.c:169 [qrtr]\n do_one_initcall+0xf5/0x5e0 init/main.c:1283\n ...\n </TASK>\n\nFix this by deferring the reference count decrement until after the\nxa_erase() and the synchronize_rcu() complete.\n\n(Note: The v1 of this patch incorrectly replaced __sock_put() with\nsock_put(). As Simon Horman pointed out, the callers of qrtr_port_remove()\nstill hold a reference to the socket, so freeing the socket memory here\nwould lead to a subsequent UAF in the caller. Thus, the __sock_put() is\nkept, but only repositioned to close the RCU race.)"}], "id": "CVE-2026-52947", "lastModified": "2026-10-19T20:18:49.507", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52947", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:23:14.590748Z", "version": "2.0.3"}}]}, "published": "2026-06-24T17:17:04.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove", "id": "2492432", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492432"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's `qrtr` network subsystem. A race condition exists in the `qrtr_port_remove()` function where the socket reference count is decremented prematurely. This allows a concurrent reader to access a socket whose reference count has dropped to zero, potentially leading to a Use-After-Free (UAF) vulnerability. An attacker could exploit this to cause memory corruption, leading to system instability or a denial of service."], "name": "CVE-2026-52947", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52947\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52947\nhttps://lore.kernel.org/linux-cve-announce/2026062402-CVE-2026-52947-8205@gregkh/T"], "threat_severity": "Moderate"}

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