CVE-2026-64177 (GCVE-0-2026-64177)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:41 – Updated: 2026-07-19 15:41
VLAI
Title
phonet/pep: disable BH around forwarded sk_receive_skb()
Summary
In the Linux kernel, the following vulnerability has been resolved: phonet/pep: disable BH around forwarded sk_receive_skb() The networking receive path is usually run from softirq context, but protocols that take the socket lock may have packets stored in the backlog and processed later from process context. In that case release_sock() -> __release_sock() drops the slock with spin_unlock_bh() and then calls sk->sk_backlog_rcv() with bottom halves enabled. Typical sk_backlog_rcv handlers process the socket whose backlog is being drained, so the BH state at entry is irrelevant for the slocks they touch. pep_do_rcv() is different: when the inbound skb targets an existing PEP pipe, it forwards the skb to a different *child* socket via sk_receive_skb(). That helper takes the child slock with bh_lock_sock_nested(), which is just spin_lock_nested() and assumes BH is already off. The same child slock therefore ends up acquired with BH on (process path) and with BH off (softirq path): process context softirq context --------------- --------------- release_sock(listener) __netif_receive_skb() __release_sock() phonet_rcv() spin_unlock_bh() __sk_receive_skb(listener) [BH now ENABLED] [BH already disabled] sk_backlog_rcv: sk_backlog_rcv: pep_do_rcv() pep_do_rcv() sk_receive_skb(child) sk_receive_skb(child) bh_lock_sock_nested(child) bh_lock_sock_nested(child) => SOFTIRQ-ON-W => IN-SOFTIRQ-W Lockdep flags this as inconsistent lock state, and it can become a real self-deadlock if a softirq on the same CPU tries to receive to the same child socket while its slock is held in the BH-enabled path: WARNING: inconsistent lock state inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1cf/0x900 __sk_receive_skb net/core/sock.c:563 sk_receive_skb include/net/sock.h:2022 [inline] pep_do_rcv net/phonet/pep.c:675 sk_backlog_rcv include/net/sock.h:1190 __release_sock net/core/sock.c:3216 release_sock net/core/sock.c:3815 pep_sock_accept net/phonet/pep.c:879 Wrap the forwarded sk_receive_skb() in local_bh_disable() / local_bh_enable() so the child slock is always acquired with BH off. local_bh_disable() nests safely on the softirq path. Discovered via in-house syzkaller fuzzing; the same root cause also on the linux-6.1.y syzbot dashboard as extid 44f0626dd6284f02663c. Reproduced under KASAN + LOCKDEP + PROVE_LOCKING, reproducer: https://pastebin.com/A3t8xzCR
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < f08c45076e4fd8b0adbc5eb186d6e6a3e7350d7b (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < b2606c302d7f2b4ee48da05e32ed60aed1b0cd53 (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < 02c04df84de709060f63e1d52ec67488c4f6f212 (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < 8420aa4900417797323dd567ba9d1512280c2dc3 (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < bd795f106b3889fb0706c6e4831c4b27e2b5666b (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < 84bc87beb4cd77670939b446326788e4c9b3db37 (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < a3fc8f2dacd1c37325977fc1fbbf3d52141df99e (git)
Affected: 9641458d3ec42def729fde64669abf07f3220cd5 , < dbc81608e3a653dea6cf403f20cae35468b8ab9c (git)
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Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 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\nphonet/pep: disable BH around forwarded sk_receive_skb()\n\nThe networking receive path is usually run from softirq context, but\nprotocols that take the socket lock may have packets stored in the\nbacklog and processed later from process context. In that case\nrelease_sock() -\u003e __release_sock() drops the slock with spin_unlock_bh()\nand then calls sk-\u003esk_backlog_rcv() with bottom halves enabled.\n\nTypical sk_backlog_rcv handlers process the socket whose backlog is\nbeing drained, so the BH state at entry is irrelevant for the slocks\nthey touch. pep_do_rcv() is different: when the inbound skb targets an\nexisting PEP pipe, it forwards the skb to a different *child* socket\nvia sk_receive_skb(). That helper takes the child slock with\nbh_lock_sock_nested(), which is just spin_lock_nested() and assumes BH\nis already off. The same child slock therefore ends up acquired with\nBH on (process path) and with BH off (softirq path):\n\n  process context                   softirq context\n  ---------------                   ---------------\n  release_sock(listener)            __netif_receive_skb()\n   __release_sock()                  phonet_rcv()\n    spin_unlock_bh()                  __sk_receive_skb(listener)\n    [BH now ENABLED]                  [BH already disabled]\n    sk_backlog_rcv:                   sk_backlog_rcv:\n     pep_do_rcv()                      pep_do_rcv()\n      sk_receive_skb(child)             sk_receive_skb(child)\n       bh_lock_sock_nested(child)        bh_lock_sock_nested(child)\n       =\u003e SOFTIRQ-ON-W                   =\u003e IN-SOFTIRQ-W\n\nLockdep flags this as inconsistent lock state, and it can become a real\nself-deadlock if a softirq on the same CPU tries to receive to the same\nchild socket while its slock is held in the BH-enabled path:\n\n  WARNING: inconsistent lock state\n  inconsistent {SOFTIRQ-ON-W} -\u003e {IN-SOFTIRQ-W} usage.\n   (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1cf/0x900\n    __sk_receive_skb              net/core/sock.c:563\n    sk_receive_skb                include/net/sock.h:2022 [inline]\n    pep_do_rcv                    net/phonet/pep.c:675\n    sk_backlog_rcv                include/net/sock.h:1190\n    __release_sock                net/core/sock.c:3216\n    release_sock                  net/core/sock.c:3815\n    pep_sock_accept               net/phonet/pep.c:879\n\nWrap the forwarded sk_receive_skb() in local_bh_disable() /\nlocal_bh_enable() so the child slock is always acquired with BH off.\nlocal_bh_disable() nests safely on the softirq path.\n\nDiscovered via in-house syzkaller fuzzing; the same root cause also\non the linux-6.1.y syzbot dashboard as extid 44f0626dd6284f02663c.\nReproduced under KASAN + LOCKDEP + PROVE_LOCKING, reproducer:\nhttps://pastebin.com/A3t8xzCR"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:41:01.534Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b2606c302d7f2b4ee48da05e32ed60aed1b0cd53"
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        {
          "url": "https://git.kernel.org/stable/c/dbc81608e3a653dea6cf403f20cae35468b8ab9c"
        }
      ],
      "title": "phonet/pep: disable BH around forwarded sk_receive_skb()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64177",
    "datePublished": "2026-07-19T15:41:01.534Z",
    "dateReserved": "2026-07-19T07:54:57.039Z",
    "dateUpdated": "2026-07-19T15:41:01.534Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-64177",
      "date": "2026-07-20",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64177\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:59.977\",\"lastModified\":\"2026-07-19T16:17:59.977\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nphonet/pep: disable BH around forwarded sk_receive_skb()\\n\\nThe networking receive path is usually run from softirq context, but\\nprotocols that take the socket lock may have packets stored in the\\nbacklog and processed later from process context. In that case\\nrelease_sock() -\u003e __release_sock() drops the slock with spin_unlock_bh()\\nand then calls sk-\u003esk_backlog_rcv() with bottom halves enabled.\\n\\nTypical sk_backlog_rcv handlers process the socket whose backlog is\\nbeing drained, so the BH state at entry is irrelevant for the slocks\\nthey touch. pep_do_rcv() is different: when the inbound skb targets an\\nexisting PEP pipe, it forwards the skb to a different *child* socket\\nvia sk_receive_skb(). That helper takes the child slock with\\nbh_lock_sock_nested(), which is just spin_lock_nested() and assumes BH\\nis already off. The same child slock therefore ends up acquired with\\nBH on (process path) and with BH off (softirq path):\\n\\n  process context                   softirq context\\n  ---------------                   ---------------\\n  release_sock(listener)            __netif_receive_skb()\\n   __release_sock()                  phonet_rcv()\\n    spin_unlock_bh()                  __sk_receive_skb(listener)\\n    [BH now ENABLED]                  [BH already disabled]\\n    sk_backlog_rcv:                   sk_backlog_rcv:\\n     pep_do_rcv()                      pep_do_rcv()\\n      sk_receive_skb(child)             sk_receive_skb(child)\\n       bh_lock_sock_nested(child)        bh_lock_sock_nested(child)\\n       =\u003e SOFTIRQ-ON-W                   =\u003e IN-SOFTIRQ-W\\n\\nLockdep flags this as inconsistent lock state, and it can become a real\\nself-deadlock if a softirq on the same CPU tries to receive to the same\\nchild socket while its slock is held in the BH-enabled path:\\n\\n  WARNING: inconsistent lock state\\n  inconsistent {SOFTIRQ-ON-W} -\u003e {IN-SOFTIRQ-W} usage.\\n   (slock-AF_PHONET/1){+.?.}-{3:3}, at: __sk_receive_skb+0x1cf/0x900\\n    __sk_receive_skb              net/core/sock.c:563\\n    sk_receive_skb                include/net/sock.h:2022 [inline]\\n    pep_do_rcv                    net/phonet/pep.c:675\\n    sk_backlog_rcv                include/net/sock.h:1190\\n    __release_sock                net/core/sock.c:3216\\n    release_sock                  net/core/sock.c:3815\\n    pep_sock_accept               net/phonet/pep.c:879\\n\\nWrap the forwarded sk_receive_skb() in local_bh_disable() /\\nlocal_bh_enable() so the child slock is always acquired with BH off.\\nlocal_bh_disable() nests safely on the softirq path.\\n\\nDiscovered via in-house syzkaller fuzzing; the same root cause also\\non the linux-6.1.y syzbot dashboard as extid 44f0626dd6284f02663c.\\nReproduced under KASAN + LOCKDEP + PROVE_LOCKING, reproducer:\\nhttps://pastebin.com/A3t8xzCR\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/phonet/pep.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"f08c45076e4fd8b0adbc5eb186d6e6a3e7350d7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"b2606c302d7f2b4ee48da05e32ed60aed1b0cd53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"02c04df84de709060f63e1d52ec67488c4f6f212\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"8420aa4900417797323dd567ba9d1512280c2dc3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"bd795f106b3889fb0706c6e4831c4b27e2b5666b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"84bc87beb4cd77670939b446326788e4c9b3db37\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"a3fc8f2dacd1c37325977fc1fbbf3d52141df99e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9641458d3ec42def729fde64669abf07f3220cd5\",\"lessThan\":\"dbc81608e3a653dea6cf403f20cae35468b8ab9c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/phonet/pep.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.28\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.28\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/02c04df84de709060f63e1d52ec67488c4f6f212\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8420aa4900417797323dd567ba9d1512280c2dc3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84bc87beb4cd77670939b446326788e4c9b3db37\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3fc8f2dacd1c37325977fc1fbbf3d52141df99e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2606c302d7f2b4ee48da05e32ed60aed1b0cd53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd795f106b3889fb0706c6e4831c4b27e2b5666b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbc81608e3a653dea6cf403f20cae35468b8ab9c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f08c45076e4fd8b0adbc5eb186d6e6a3e7350d7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.