{"api_version":"1","generated_at":"2026-06-24T22:49:11+00:00","cve":"CVE-2026-52947","urls":{"html":"https://cve.report/CVE-2026-52947","api":"https://cve.report/api/cve/CVE-2026-52947.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-52947","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-52947"},"summary":{"title":"net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove","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.)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:04","updated_at":"2026-06-24 17:17:04"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df","name":"https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5","name":"https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d","name":"https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b","name":"https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3","name":"https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da","name":"https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b","name":"https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00","name":"https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52947","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52947","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 2aa4c12723fe432e623462a3be42a197a128722b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 03bfa95e452e2b6ccd76a332060ae4feaf5ad84d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 474293d90880622fde9d2430fb0165767090f7b3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 2047c2aa0963bb2872fd722300a15bcb441a4c00 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 7de2d447072be3b1a76793f034432338fc9c494b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 ab269990ed58143a92a263be1bee626d82ac03da git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 3b20ec8f31e8a6a6782243f473b0abd3463621df git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bdabad3e363d825ddf9679dd431cca0b2c30f881 a2171131ecda1ed61a594a1eb715e75fdad0fef5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/qrtr/af_qrtr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2aa4c12723fe432e623462a3be42a197a128722b","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"03bfa95e452e2b6ccd76a332060ae4feaf5ad84d","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"474293d90880622fde9d2430fb0165767090f7b3","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"2047c2aa0963bb2872fd722300a15bcb441a4c00","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"7de2d447072be3b1a76793f034432338fc9c494b","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"ab269990ed58143a92a263be1bee626d82ac03da","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"3b20ec8f31e8a6a6782243f473b0abd3463621df","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"},{"lessThan":"a2171131ecda1ed61a594a1eb715e75fdad0fef5","status":"affected","version":"bdabad3e363d825ddf9679dd431cca0b2c30f881","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/qrtr/af_qrtr.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.7"},{"lessThan":"4.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"4.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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.)"}],"providerMetadata":{"dateUpdated":"2026-06-24T16:26:05.062Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-52947","datePublished":"2026-06-24T16:26:05.062Z","dateReserved":"2026-06-09T07:44:35.371Z","dateUpdated":"2026-06-24T16:26:05.062Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 17:17:04","lastModifiedDate":"2026-06-24 17:17:04","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"52947","Ordinal":"1","Title":"net: qrtr: fix refcount saturation and potential UAF in qrtr_por","CVE":"CVE-2026-52947","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"52947","Ordinal":"1","NoteData":"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.)","Type":"Description","Title":"net: qrtr: fix refcount saturation and potential UAF in qrtr_por"}]}}}