CVE-2026-52947 (GCVE-0-2026-52947)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:26 – Updated: 2026-06-28 06:37
VLAI
Title
net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove
Summary
In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove In qrtr_port_remove(), the socket reference count is decremented via __sock_put() before the port is removed from the qrtr_ports XArray and before the RCU grace period elapses. This breaks the fundamental RCU update paradigm. It exposes a race window where a concurrent RCU reader (such as qrtr_reset_ports() or qrtr_port_lookup()) can obtain a pointer to the socket from the XArray, and attempt to call sock_hold() on a socket whose reference count has already dropped to zero. This exact race condition was hit during syzkaller fuzzing, leading to the following refcount saturation warning and a potential Use-After-Free: refcount_t: saturated; leaking memory. WARNING: CPU: 3 PID: 1273 at lib/refcount.c:22 refcount_warn_saturate+0xae/0x1d0 Modules linked in: qrtr(+) bochs drm_shmem_helper ... Call Trace: <TASK> qrtr_reset_ports net/qrtr/af_qrtr.c:768 [inline] [qrtr] __qrtr_bind.isra.0+0x48b/0x570 net/qrtr/af_qrtr.c:805 [qrtr] qrtr_bind+0x17d/0x210 net/qrtr/af_qrtr.c:901 [qrtr] kernel_bind+0xe4/0x120 net/socket.c:3592 qrtr_ns_init+0x1a6/0x380 net/qrtr/ns.c:715 [qrtr] qrtr_proto_init+0x3b/0xff0 net/qrtr/af_qrtr.c:169 [qrtr] do_one_initcall+0xf5/0x5e0 init/main.c:1283 ... </TASK> Fix this by deferring the reference count decrement until after the xa_erase() and the synchronize_rcu() complete. (Note: The v1 of this patch incorrectly replaced __sock_put() with sock_put(). As Simon Horman pointed out, the callers of qrtr_port_remove() still hold a reference to the socket, so freeing the socket memory here would lead to a subsequent UAF in the caller. Thus, the __sock_put() is kept, but only repositioned to close the RCU race.)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 2aa4c12723fe432e623462a3be42a197a128722b (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 03bfa95e452e2b6ccd76a332060ae4feaf5ad84d (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 474293d90880622fde9d2430fb0165767090f7b3 (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 2047c2aa0963bb2872fd722300a15bcb441a4c00 (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 7de2d447072be3b1a76793f034432338fc9c494b (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < ab269990ed58143a92a263be1bee626d82ac03da (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < 3b20ec8f31e8a6a6782243f473b0abd3463621df (git)
Affected: bdabad3e363d825ddf9679dd431cca0b2c30f881 , < a2171131ecda1ed61a594a1eb715e75fdad0fef5 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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.)"
        }
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            "version": "3.1"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52947",
    "datePublished": "2026-06-24T16:26:05.062Z",
    "dateReserved": "2026-06-09T07:44:35.371Z",
    "dateUpdated": "2026-06-28T06:37:05.590Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-52947",
      "date": "2026-08-03",
      "epss": "0.00135",
      "percentile": "0.03375"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:52:32.000Z",
      "cve": "CVE-2026-52947",
      "id": "msrc_CVE-2026-52947",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52947.json",
      "version": "2"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52947\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:04.760\",\"lastModified\":\"2026-07-14T16:58:25.560\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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   \u003cTASK\u003e\\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   \u003c/TASK\u003e\\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.)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/qrtr/af_qrtr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"2aa4c12723fe432e623462a3be42a197a128722b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"03bfa95e452e2b6ccd76a332060ae4feaf5ad84d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"474293d90880622fde9d2430fb0165767090f7b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"2047c2aa0963bb2872fd722300a15bcb441a4c00\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"7de2d447072be3b1a76793f034432338fc9c494b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"ab269990ed58143a92a263be1bee626d82ac03da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"3b20ec8f31e8a6a6782243f473b0abd3463621df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bdabad3e363d825ddf9679dd431cca0b2c30f881\",\"lessThan\":\"a2171131ecda1ed61a594a1eb715e75fdad0fef5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/qrtr/af_qrtr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.7\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"3FA30F1C-F514-4A35-83AD-10A879443A42\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.210\",\"matchCriteriaId\":\"5E938CDF-D1C4-43D0-98DC-9E11B6B55801\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"C4446623-5F2B-4DD8-8666-9FAAC285A757\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"85421C0C-ABDE-4357-971C-67F9087DE1B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.36\",\"matchCriteriaId\":\"389025D2-958D-41BD-BD96-70ED1033A9F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"v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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-27T16:30:50+00:00",
      "cve": "CVE-2026-52947",
      "id": "CVE-2026-52947",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52947.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-26T02:15:02Z",
      "cve": "CVE-2026-52947",
      "id": "CVE-2026-52947",
      "initial_release_date": "2026-06-26T02:15:02Z",
      "product_status:known_affected": "285",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52947",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52947.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.