{ "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 \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 \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": "Secondary", "description": [ { "lang": "en", "value": "NVD-CWE-Other" } ] 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