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CVE-2026-80819 (GCVE-0-2026-80819)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept rfcomm_sock_recvmsg() completes a deferred setup by calling rfcomm_dlc_accept() without holding any RFCOMM lock: if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { rfcomm_dlc_accept(d); return 0; } and rfcomm_dlc_accept() dereferences the session on its first line: struct sock *sk = d->session->sock->sk; Every other path that touches d->session runs under rfcomm_mutex: rfcomm_dlc_open(), rfcomm_dlc_close(), rfcomm_dlc_exists(), rfcomm_dlc_send_rpn(), and the RFCOMM thread through rfcomm_process_sessions(). rfcomm_connect_ind() is even documented as "called under rfcomm_lock()". This call site is the only one that skips it. The RFCOMM_DEFER_SETUP bit looks like it serialises the accept against teardown, since __rfcomm_dlc_close() returns early when it wins the test_and_clear. But rfcomm_recv_disc() forces the state first: d->state = BT_CLOSED; __rfcomm_dlc_close(d, err); and the early return only covers BT_CONNECT, BT_CONFIG, BT_OPEN and BT_CONNECT2. With the state already BT_CLOSED that switch does not match, the bit is never consulted, and __rfcomm_dlc_close() falls through to rfcomm_dlc_unlink(), which sets d->session = NULL. So a remote DISC on a deferred dlc clears the session while leaving RFCOMM_DEFER_SETUP set. The next recvmsg() then passes the test_and_clear and dereferences a NULL session. No timing window is needed: once the DISC has been processed, the dereference is unconditional. Give rfcomm_dlc_accept() the same shape as rfcomm_dlc_open() and rfcomm_dlc_close(): an exported wrapper that takes rfcomm_mutex and re-checks the session, around a __rfcomm_dlc_accept() that the two in-core callers, which already hold the mutex, keep using. Reproduced on a KASAN + PROVE_LOCKING kernel with a BR/EDR peer emulated over /dev/vhci: the peer brings up an ACL link, opens L2CAP on the RFCOMM PSM, starts a session, opens a dlc on a channel bound with BT_DEFER_SETUP, and sends DISC after the socket is accepted. recv() on the accepted socket then hits: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:rfcomm_dlc_accept+0x54/0x350 Call Trace: rfcomm_sock_recvmsg+0x1cd/0x230 sock_recvmsg+0x166/0x1c0 __sys_recvfrom+0x20d/0x300 0x10 is the offset of sock in struct rfcomm_session. With this patch the same run completes with recv() returning 0 and no report, and lockdep stays quiet, confirming rfcomm_mutex is still taken before lock_sock on this path as it is on the thread side.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < d8d686dd5662a7c4745e4515f1237a9f3b7df181 (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2 (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < 56f0aa75c7640e46397ef73bea251fcbef9150c0 (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < 362726c9c6e56eea4262109183e49868c39ccd3a (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < 825b95561d7b7c393df9e7bc295451aaeadc3d18 (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < d4b1a13b1eff2e80925c7368ffdeaaa50cba93df (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < 355bfd57ca4ca881c6eb03ca813b440a094b1f44 (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < b405c2f96ae2e37375105881890f7738833b1d62 (git)
Affected: bb23c0ab824653be4aa7dfca15b07b3059717004 , < 43a556b2fd43f2df6dded59c2e26560a27874c24 (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept\n\nrfcomm_sock_recvmsg() completes a deferred setup by calling\nrfcomm_dlc_accept() without holding any RFCOMM lock:\n\n\tif (test_and_clear_bit(RFCOMM_DEFER_SETUP, \u0026d-\u003eflags)) {\n\t\trfcomm_dlc_accept(d);\n\t\treturn 0;\n\t}\n\nand rfcomm_dlc_accept() dereferences the session on its first line:\n\n\tstruct sock *sk = d-\u003esession-\u003esock-\u003esk;\n\nEvery other path that touches d-\u003esession runs under rfcomm_mutex:\nrfcomm_dlc_open(), rfcomm_dlc_close(), rfcomm_dlc_exists(),\nrfcomm_dlc_send_rpn(), and the RFCOMM thread through\nrfcomm_process_sessions(). rfcomm_connect_ind() is even documented as\n\"called under rfcomm_lock()\". This call site is the only one that skips\nit.\n\nThe RFCOMM_DEFER_SETUP bit looks like it serialises the accept against\nteardown, since __rfcomm_dlc_close() returns early when it wins the\ntest_and_clear. But rfcomm_recv_disc() forces the state first:\n\n\td-\u003estate = BT_CLOSED;\n\t__rfcomm_dlc_close(d, err);\n\nand the early return only covers BT_CONNECT, BT_CONFIG, BT_OPEN and\nBT_CONNECT2. With the state already BT_CLOSED that switch does not\nmatch, the bit is never consulted, and __rfcomm_dlc_close() falls\nthrough to rfcomm_dlc_unlink(), which sets d-\u003esession = NULL.\n\nSo a remote DISC on a deferred dlc clears the session while leaving\nRFCOMM_DEFER_SETUP set. The next recvmsg() then passes the\ntest_and_clear and dereferences a NULL session. No timing window is\nneeded: once the DISC has been processed, the dereference is\nunconditional.\n\nGive rfcomm_dlc_accept() the same shape as rfcomm_dlc_open() and\nrfcomm_dlc_close(): an exported wrapper that takes rfcomm_mutex and\nre-checks the session, around a __rfcomm_dlc_accept() that the two\nin-core callers, which already hold the mutex, keep using.\n\nReproduced on a KASAN + PROVE_LOCKING kernel with a BR/EDR peer emulated\nover /dev/vhci: the peer brings up an ACL link, opens L2CAP on the\nRFCOMM PSM, starts a session, opens a dlc on a channel bound with\nBT_DEFER_SETUP, and sends DISC after the socket is accepted. recv() on\nthe accepted socket then hits:\n\n  Oops: general protection fault\n  KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n  RIP: 0010:rfcomm_dlc_accept+0x54/0x350\n  Call Trace:\n    rfcomm_sock_recvmsg+0x1cd/0x230\n    sock_recvmsg+0x166/0x1c0\n    __sys_recvfrom+0x20d/0x300\n\n0x10 is the offset of sock in struct rfcomm_session. With this patch the\nsame run completes with recv() returning 0 and no report, and lockdep\nstays quiet, confirming rfcomm_mutex is still taken before lock_sock on\nthis path as it is on the thread side."
        }
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        "dateUpdated": "2026-09-04T15:13:40.309Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d8d686dd5662a7c4745e4515f1237a9f3b7df181"
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        {
          "url": "https://git.kernel.org/stable/c/eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2"
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          "url": "https://git.kernel.org/stable/c/362726c9c6e56eea4262109183e49868c39ccd3a"
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        {
          "url": "https://git.kernel.org/stable/c/825b95561d7b7c393df9e7bc295451aaeadc3d18"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4b1a13b1eff2e80925c7368ffdeaaa50cba93df"
        },
        {
          "url": "https://git.kernel.org/stable/c/355bfd57ca4ca881c6eb03ca813b440a094b1f44"
        },
        {
          "url": "https://git.kernel.org/stable/c/b405c2f96ae2e37375105881890f7738833b1d62"
        },
        {
          "url": "https://git.kernel.org/stable/c/43a556b2fd43f2df6dded59c2e26560a27874c24"
        }
      ],
      "title": "Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80819",
    "datePublished": "2026-09-04T15:13:40.309Z",
    "dateReserved": "2026-08-26T14:34:25.795Z",
    "dateUpdated": "2026-09-04T15:13:40.309Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80819",
      "date": "2026-09-15",
      "epss": "0.00195",
      "percentile": "0.09414"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T01:55:33.000Z",
      "cve": "CVE-2026-80819",
      "id": "msrc_CVE-2026-80819",
      "initial_release_date": "2026-09-07T01:55:33.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80819.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80819\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:09.583\",\"lastModified\":\"2026-09-04T16:18:09.583\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept\\n\\nrfcomm_sock_recvmsg() completes a deferred setup by calling\\nrfcomm_dlc_accept() without holding any RFCOMM lock:\\n\\n\\tif (test_and_clear_bit(RFCOMM_DEFER_SETUP, \u0026d-\u003eflags)) {\\n\\t\\trfcomm_dlc_accept(d);\\n\\t\\treturn 0;\\n\\t}\\n\\nand rfcomm_dlc_accept() dereferences the session on its first line:\\n\\n\\tstruct sock *sk = d-\u003esession-\u003esock-\u003esk;\\n\\nEvery other path that touches d-\u003esession runs under rfcomm_mutex:\\nrfcomm_dlc_open(), rfcomm_dlc_close(), rfcomm_dlc_exists(),\\nrfcomm_dlc_send_rpn(), and the RFCOMM thread through\\nrfcomm_process_sessions(). rfcomm_connect_ind() is even documented as\\n\\\"called under rfcomm_lock()\\\". This call site is the only one that skips\\nit.\\n\\nThe RFCOMM_DEFER_SETUP bit looks like it serialises the accept against\\nteardown, since __rfcomm_dlc_close() returns early when it wins the\\ntest_and_clear. But rfcomm_recv_disc() forces the state first:\\n\\n\\td-\u003estate = BT_CLOSED;\\n\\t__rfcomm_dlc_close(d, err);\\n\\nand the early return only covers BT_CONNECT, BT_CONFIG, BT_OPEN and\\nBT_CONNECT2. With the state already BT_CLOSED that switch does not\\nmatch, the bit is never consulted, and __rfcomm_dlc_close() falls\\nthrough to rfcomm_dlc_unlink(), which sets d-\u003esession = NULL.\\n\\nSo a remote DISC on a deferred dlc clears the session while leaving\\nRFCOMM_DEFER_SETUP set. The next recvmsg() then passes the\\ntest_and_clear and dereferences a NULL session. No timing window is\\nneeded: once the DISC has been processed, the dereference is\\nunconditional.\\n\\nGive rfcomm_dlc_accept() the same shape as rfcomm_dlc_open() and\\nrfcomm_dlc_close(): an exported wrapper that takes rfcomm_mutex and\\nre-checks the session, around a __rfcomm_dlc_accept() that the two\\nin-core callers, which already hold the mutex, keep using.\\n\\nReproduced on a KASAN + PROVE_LOCKING kernel with a BR/EDR peer emulated\\nover /dev/vhci: the peer brings up an ACL link, opens L2CAP on the\\nRFCOMM PSM, starts a session, opens a dlc on a channel bound with\\nBT_DEFER_SETUP, and sends DISC after the socket is accepted. recv() on\\nthe accepted socket then hits:\\n\\n  Oops: general protection fault\\n  KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\\n  RIP: 0010:rfcomm_dlc_accept+0x54/0x350\\n  Call Trace:\\n    rfcomm_sock_recvmsg+0x1cd/0x230\\n    sock_recvmsg+0x166/0x1c0\\n    __sys_recvfrom+0x20d/0x300\\n\\n0x10 is the offset of sock in struct rfcomm_session. With this patch the\\nsame run completes with recv() returning 0 and no report, and lockdep\\nstays quiet, confirming rfcomm_mutex is still taken before lock_sock on\\nthis path as it is on the thread side.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/rfcomm/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"d8d686dd5662a7c4745e4515f1237a9f3b7df181\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"56f0aa75c7640e46397ef73bea251fcbef9150c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"362726c9c6e56eea4262109183e49868c39ccd3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"825b95561d7b7c393df9e7bc295451aaeadc3d18\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"d4b1a13b1eff2e80925c7368ffdeaaa50cba93df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"355bfd57ca4ca881c6eb03ca813b440a094b1f44\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"b405c2f96ae2e37375105881890f7738833b1d62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bb23c0ab824653be4aa7dfca15b07b3059717004\",\"lessThan\":\"43a556b2fd43f2df6dded59c2e26560a27874c24\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/rfcomm/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.30\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.30\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/355bfd57ca4ca881c6eb03ca813b440a094b1f44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/362726c9c6e56eea4262109183e49868c39ccd3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43a556b2fd43f2df6dded59c2e26560a27874c24\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56f0aa75c7640e46397ef73bea251fcbef9150c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/825b95561d7b7c393df9e7bc295451aaeadc3d18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b405c2f96ae2e37375105881890f7738833b1d62\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4b1a13b1eff2e80925c7368ffdeaaa50cba93df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d8d686dd5662a7c4745e4515f1237a9f3b7df181\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T17:16:54Z",
      "cve": "CVE-2026-80819",
      "id": "CVE-2026-80819",
      "initial_release_date": "2026-09-08T17:16:54Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80819",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80819.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.