{"cve":{"cve_id":"CVE-2026-52947","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":null,"epss_percentile":null,"epss_as_of":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove\n\nIn qrtr_port_remove(), the socket reference count is decremented via\n__sock_put() before the port is removed from the qrtr_ports XArray and\nbefore the RCU grace period elapses.\n\nThis breaks the fundamental RCU update paradigm. 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.)","published_at":"2026-06-24T16:26:05.062000Z","last_modified_at":null,"cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b","https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d","https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3","https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00","https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b","https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da","https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df","https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-28T17:55:22.518073Z","updated_at":"2026-06-28T23:30:49.890169Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"2aa4c12723fe432e623462a3be42a197a128722b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:2aa4c12723fe432e623462a3be42a197a128722b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"03bfa95e452e2b6ccd76a332060ae4feaf5ad84d","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:03bfa95e452e2b6ccd76a332060ae4feaf5ad84d"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"474293d90880622fde9d2430fb0165767090f7b3","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:474293d90880622fde9d2430fb0165767090f7b3"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"2047c2aa0963bb2872fd722300a15bcb441a4c00","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:2047c2aa0963bb2872fd722300a15bcb441a4c00"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"7de2d447072be3b1a76793f034432338fc9c494b","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:7de2d447072be3b1a76793f034432338fc9c494b"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"ab269990ed58143a92a263be1bee626d82ac03da","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:ab269990ed58143a92a263be1bee626d82ac03da"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"3b20ec8f31e8a6a6782243f473b0abd3463621df","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:3b20ec8f31e8a6a6782243f473b0abd3463621df"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"bdabad3e363d825ddf9679dd431cca0b2c30f881","version_start_inclusive":true,"version_end":"a2171131ecda1ed61a594a1eb715e75fdad0fef5","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:bdabad3e363d825ddf9679dd431cca0b2c30f881:a2171131ecda1ed61a594a1eb715e75fdad0fef5"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"4.7","version_start_inclusive":true,"version_end":"4.7","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:4.7:4.7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"0","version_start_inclusive":true,"version_end":"4.7","version_end_inclusive":false,"cpe23_uri":"cve5:linux:linux:0:4.7"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.10.259","version_start_inclusive":true,"version_end":"5.10.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.10.259:5.10.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"5.15.210","version_start_inclusive":true,"version_end":"5.15.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:5.15.210:5.15.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.1.176","version_start_inclusive":true,"version_end":"6.1.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.1.176:6.1.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.6.143","version_start_inclusive":true,"version_end":"6.6.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.6.143:6.6.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.12.94","version_start_inclusive":true,"version_end":"6.12.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.12.94:6.12.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"6.18.36","version_start_inclusive":true,"version_end":"6.18.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:6.18.36:6.18.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.0.13","version_start_inclusive":true,"version_end":"7.0.*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.0.13:7.0.*"},{"vendor_slug":"linux","vendor_name":"Linux","product_slug":"linux","product_name":"Linux","version_start":"7.1","version_start_inclusive":true,"version_end":"*","version_end_inclusive":true,"cpe23_uri":"cve5:linux:linux:7.1:*"}],"exploit_refs":[],"news":[],"references":[{"url":"https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df","source_type":"MISC","tags":[]},{"url":"https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-06-24T16:26:05.062000Z","label":"CVE published","source":null}]}