CVE-2025-39765

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: timer: fix ida_free call while not allocated<br /> <br /> In the snd_utimer_create() function, if the kasprintf() function return<br /> NULL, snd_utimer_put_id() will be called, finally use ida_free()<br /> to free the unallocated id 0.<br /> <br /> the syzkaller reported the following information:<br /> ------------[ cut here ]------------<br /> ida_free called for id=0 which is not allocated.<br /> WARNING: CPU: 1 PID: 1286 at lib/idr.c:592 ida_free+0x1fd/0x2f0 lib/idr.c:592<br /> Modules linked in:<br /> CPU: 1 UID: 0 PID: 1286 Comm: syz-executor164 Not tainted 6.15.8 #3 PREEMPT(lazy)<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-4.fc42 04/01/2014<br /> RIP: 0010:ida_free+0x1fd/0x2f0 lib/idr.c:592<br /> Code: f8 fc 41 83 fc 3e 76 69 e8 70 b2 f8 (...)<br /> RSP: 0018:ffffc900007f79c8 EFLAGS: 00010282<br /> RAX: 0000000000000000 RBX: 1ffff920000fef3b RCX: ffffffff872176a5<br /> RDX: ffff88800369d200 RSI: 0000000000000000 RDI: ffff88800369d200<br /> RBP: 0000000000000000 R08: ffffffff87ba60a5 R09: 0000000000000000<br /> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000<br /> R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000<br /> FS: 00007f6f1abc1740(0000) GS:ffff8880d76a0000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 00007f6f1ad7a784 CR3: 000000007a6e2000 CR4: 00000000000006f0<br /> Call Trace:<br /> <br /> snd_utimer_put_id sound/core/timer.c:2043 [inline] [snd_timer]<br /> snd_utimer_create+0x59b/0x6a0 sound/core/timer.c:2184 [snd_timer]<br /> snd_utimer_ioctl_create sound/core/timer.c:2202 [inline] [snd_timer]<br /> __snd_timer_user_ioctl.isra.0+0x724/0x1340 sound/core/timer.c:2287 [snd_timer]<br /> snd_timer_user_ioctl+0x75/0xc0 sound/core/timer.c:2298 [snd_timer]<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl fs/ioctl.c:893 [inline]<br /> __x64_sys_ioctl+0x198/0x200 fs/ioctl.c:893<br /> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]<br /> do_syscall_64+0x7b/0x160 arch/x86/entry/syscall_64.c:94<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> [...]<br /> <br /> The utimer-&gt;id should be set properly before the kasprintf() function,<br /> ensures the snd_utimer_put_id() function will free the allocated id.