CVE-2025-21792 (GCVE-0-2025-21792)
Vulnerability from cvelistv5
Published
2025-02-27 02:18
Modified
2025-05-04 13:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt If an AX25 device is bound to a socket by setting the SO_BINDTODEVICE socket option, a refcount leak will occur in ax25_release(). Commit 9fd75b66b8f6 ("ax25: Fix refcount leaks caused by ax25_cb_del()") added decrement of device refcounts in ax25_release(). In order for that to work correctly the refcounts must already be incremented when the device is bound to the socket. An AX25 device can be bound to a socket by either calling ax25_bind() or setting SO_BINDTODEVICE socket option. In both cases the refcounts should be incremented, but in fact it is done only in ax25_bind(). This bug leads to the following issue reported by Syzkaller: ================================================================ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 1 PID: 5932 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 Modules linked in: CPU: 1 UID: 0 PID: 5932 Comm: syz-executor424 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 Call Trace: <TASK> __refcount_dec include/linux/refcount.h:336 [inline] refcount_dec include/linux/refcount.h:351 [inline] ref_tracker_free+0x710/0x820 lib/ref_tracker.c:236 netdev_tracker_free include/linux/netdevice.h:4156 [inline] netdev_put include/linux/netdevice.h:4173 [inline] netdev_put include/linux/netdevice.h:4169 [inline] ax25_release+0x33f/0xa10 net/ax25/af_ax25.c:1069 __sock_release+0xb0/0x270 net/socket.c:640 sock_close+0x1c/0x30 net/socket.c:1408 ... do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ... </TASK> ================================================================ Fix the implementation of ax25_setsockopt() by adding increment of refcounts for the new device bound, and decrement of refcounts for the old unbound device.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: 9fd75b66b8f68498454d685dc4ba13192ae069b0
Version: c44a453ffe16eb08acdc6129ac4fa0192dbc0456
Version: de55a1338e6a48ff1e41ea8db1432496fbe2a62b
Version: 9e1e088a57c23251f1cfe9601bbd90ade2ea73b9
Version: b20a5ab0f5fb175750c6bafd4cf12daccf00c738
Version: 452ae92b99062d2f6a34324eaf705a3b7eac9f8b
Version: 534156dd4ed768e30a43de0036f45dca7c54818f
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt\n\nIf an AX25 device is bound to a socket by setting the SO_BINDTODEVICE\nsocket option, a refcount leak will occur in ax25_release().\n\nCommit 9fd75b66b8f6 (\"ax25: Fix refcount leaks caused by ax25_cb_del()\")\nadded decrement of device refcounts in ax25_release(). In order for that\nto work correctly the refcounts must already be incremented when the\ndevice is bound to the socket. An AX25 device can be bound to a socket\nby either calling ax25_bind() or setting SO_BINDTODEVICE socket option.\nIn both cases the refcounts should be incremented, but in fact it is done\nonly in ax25_bind().\n\nThis bug leads to the following issue reported by Syzkaller:\n\n================================================================\nrefcount_t: decrement hit 0; leaking memory.\nWARNING: CPU: 1 PID: 5932 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31\nModules linked in:\nCPU: 1 UID: 0 PID: 5932 Comm: syz-executor424 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31\nCall Trace:\n \u003cTASK\u003e\n __refcount_dec include/linux/refcount.h:336 [inline]\n refcount_dec include/linux/refcount.h:351 [inline]\n ref_tracker_free+0x710/0x820 lib/ref_tracker.c:236\n netdev_tracker_free include/linux/netdevice.h:4156 [inline]\n netdev_put include/linux/netdevice.h:4173 [inline]\n netdev_put include/linux/netdevice.h:4169 [inline]\n ax25_release+0x33f/0xa10 net/ax25/af_ax25.c:1069\n __sock_release+0xb0/0x270 net/socket.c:640\n sock_close+0x1c/0x30 net/socket.c:1408\n ...\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n ...\n \u003c/TASK\u003e\n================================================================\n\nFix the implementation of ax25_setsockopt() by adding increment of\nrefcounts for the new device bound, and decrement of refcounts for\nthe old unbound device."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T13:06:32.093Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/90056ece99966182dc0e367f3fd2afab46ada847"
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          "url": "https://git.kernel.org/stable/c/bca0902e61731a75fc4860c8720168d9f1bae3b6"
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    "cveId": "CVE-2025-21792",
    "datePublished": "2025-02-27T02:18:29.653Z",
    "dateReserved": "2024-12-29T08:45:45.767Z",
    "dateUpdated": "2025-05-04T13:06:32.093Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21792\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T03:15:20.080\",\"lastModified\":\"2025-03-05T18:38:40.167\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt\\n\\nIf an AX25 device is bound to a socket by setting the SO_BINDTODEVICE\\nsocket option, a refcount leak will occur in ax25_release().\\n\\nCommit 9fd75b66b8f6 (\\\"ax25: Fix refcount leaks caused by ax25_cb_del()\\\")\\nadded decrement of device refcounts in ax25_release(). In order for that\\nto work correctly the refcounts must already be incremented when the\\ndevice is bound to the socket. An AX25 device can be bound to a socket\\nby either calling ax25_bind() or setting SO_BINDTODEVICE socket option.\\nIn both cases the refcounts should be incremented, but in fact it is done\\nonly in ax25_bind().\\n\\nThis bug leads to the following issue reported by Syzkaller:\\n\\n================================================================\\nrefcount_t: decrement hit 0; leaking memory.\\nWARNING: CPU: 1 PID: 5932 at lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31\\nModules linked in:\\nCPU: 1 UID: 0 PID: 5932 Comm: syz-executor424 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\\nRIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31\\nCall Trace:\\n \u003cTASK\u003e\\n __refcount_dec include/linux/refcount.h:336 [inline]\\n refcount_dec include/linux/refcount.h:351 [inline]\\n ref_tracker_free+0x710/0x820 lib/ref_tracker.c:236\\n netdev_tracker_free include/linux/netdevice.h:4156 [inline]\\n netdev_put include/linux/netdevice.h:4173 [inline]\\n netdev_put include/linux/netdevice.h:4169 [inline]\\n ax25_release+0x33f/0xa10 net/ax25/af_ax25.c:1069\\n __sock_release+0xb0/0x270 net/socket.c:640\\n sock_close+0x1c/0x30 net/socket.c:1408\\n ...\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n ...\\n \u003c/TASK\u003e\\n================================================================\\n\\nFix the implementation of ax25_setsockopt() by adding increment of\\nrefcounts for the new device bound, and decrement of refcounts for\\nthe old unbound device.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt Si un dispositivo AX25 est\u00e1 enlazado a un socket configurando la opci\u00f3n de socket SO_BINDTODEVICE, se producir\u00e1 una p\u00e9rdida de refcount en ax25_release(). el commit 9fd75b66b8f6 (\\\"ax25: Fix refcount leaks caused by ax25_cb_del()\\\") a\u00f1adi\u00f3 una disminuci\u00f3n de los refcounts del dispositivo en ax25_release(). Para que funcione correctamente, los refcounts ya deben estar incrementados cuando el dispositivo est\u00e1 enlazado al socket. Un dispositivo AX25 puede estar enlazado a un socket llamando a ax25_bind() o configurando la opci\u00f3n de socket SO_BINDTODEVICE. En ambos casos, los refcounts deben incrementarse, pero de hecho solo se hace en ax25_bind(). Este error conduce al siguiente problema informado por Syzkaller: ================================================================= refcount_t: el decremento lleg\u00f3 a 0; p\u00e9rdida de memoria. ADVERTENCIA: CPU: 1 PID: 5932 en lib/refcount.c:31 refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 M\u00f3dulos vinculados: CPU: 1 UID: 0 PID: 5932 Comm: syz-executor424 No contaminado 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:refcount_warn_saturate+0x1ed/0x210 lib/refcount.c:31 Seguimiento de llamadas:  __refcount_dec include/linux/refcount.h:336 [en l\u00ednea] refcount_dec include/linux/refcount.h:351 [en l\u00ednea] ref_tracker_free+0x710/0x820 lib/ref_tracker.c:236 netdev_tracker_free include/linux/netdevice.h:4156 [en l\u00ednea] netdev_put include/linux/netdevice.h:4173 [en l\u00ednea] netdev_put include/linux/netdevice.h:4169 [en l\u00ednea] ax25_release+0x33f/0xa10 net/ax25/af_ax25.c:1069 __sock_release+0xb0/0x270 net/socket.c:640 sock_close+0x1c/0x30 net/socket.c:1408 ... do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ...  ================================================================== Corrija la implementaci\u00f3n de ax25_setsockopt() agregando un incremento de recuentos de referencias para el nuevo dispositivo vinculado y una disminuci\u00f3n de recuentos de referencias para el antiguo dispositivo no vinculado.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.14.277\",\"versionEndExcluding\":\"4.15\",\"matchCriteriaId\":\"26F3B000-E328-48CE-9B1E-68E0DFD0A909\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.19.240\",\"versionEndExcluding\":\"4.20\",\"matchCriteriaId\":\"36C10971-E218-4588-B691-A4A3534A3B58\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.190\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"38031C07-F0BC-442A-A08F-FB9B732F2CA5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.112\",\"versionEndExcluding\":\"5.11\",\"matchCriteriaId\":\"E1C7F59E-6FCD-4163-9D36-1585FB5A71E7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.35\",\"versionEndExcluding\":\"5.16\",\"matchCriteriaId\":\"5DFF4167-1962-4F68-81DD-C3D56FE88E76\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17.2\",\"versionEndExcluding\":\"6.1.129\",\"matchCriteriaId\":\"EB2089C3-1FFD-4729-9C94-A45890155918\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.79\",\"matchCriteriaId\":\"B16AADE5-B2FD-4C14-B4E4-85E8EDAFE775\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.16\",\"matchCriteriaId\":\"13C8DB18-FC60-425F-84E5-3EDDEC61B2FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.4\",\"matchCriteriaId\":\"2A2093ED-74A9-43F9-AC72-50030F374EA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"186716B6-2B66-4BD0-852E-D48E71C0C85F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D3E781C-403A-498F-9DA9-ECEE50F41E75\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/470bda72fda0fcf54300466d70ce2de62f7835d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Mailing 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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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