{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-39765",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T07:20:57.126Z",
        "datePublished": "2025-09-11T16:56:20.738Z",
        "dateUpdated": "2026-05-11T21:35:49.504Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T21:35:49.504Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: fix ida_free call while not allocated\n\nIn the snd_utimer_create() function, if the kasprintf() function return\nNULL, snd_utimer_put_id() will be called, finally use ida_free()\nto free the unallocated id 0.\n\nthe syzkaller reported the following information:\n  ------------[ cut here ]------------\n  ida_free called for id=0 which is not allocated.\n  WARNING: CPU: 1 PID: 1286 at lib/idr.c:592 ida_free+0x1fd/0x2f0 lib/idr.c:592\n  Modules linked in:\n  CPU: 1 UID: 0 PID: 1286 Comm: syz-executor164 Not tainted 6.15.8 #3 PREEMPT(lazy)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-4.fc42 04/01/2014\n  RIP: 0010:ida_free+0x1fd/0x2f0 lib/idr.c:592\n  Code: f8 fc 41 83 fc 3e 76 69 e8 70 b2 f8 (...)\n  RSP: 0018:ffffc900007f79c8 EFLAGS: 00010282\n  RAX: 0000000000000000 RBX: 1ffff920000fef3b RCX: ffffffff872176a5\n  RDX: ffff88800369d200 RSI: 0000000000000000 RDI: ffff88800369d200\n  RBP: 0000000000000000 R08: ffffffff87ba60a5 R09: 0000000000000000\n  R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000\n  R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000\n  FS:  00007f6f1abc1740(0000) GS:ffff8880d76a0000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f6f1ad7a784 CR3: 000000007a6e2000 CR4: 00000000000006f0\n  Call Trace:\n   <TASK>\n   snd_utimer_put_id sound/core/timer.c:2043 [inline] [snd_timer]\n   snd_utimer_create+0x59b/0x6a0 sound/core/timer.c:2184 [snd_timer]\n   snd_utimer_ioctl_create sound/core/timer.c:2202 [inline] [snd_timer]\n   __snd_timer_user_ioctl.isra.0+0x724/0x1340 sound/core/timer.c:2287 [snd_timer]\n   snd_timer_user_ioctl+0x75/0xc0 sound/core/timer.c:2298 [snd_timer]\n   vfs_ioctl fs/ioctl.c:51 [inline]\n   __do_sys_ioctl fs/ioctl.c:907 [inline]\n   __se_sys_ioctl fs/ioctl.c:893 [inline]\n   __x64_sys_ioctl+0x198/0x200 fs/ioctl.c:893\n   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0x7b/0x160 arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  [...]\n\nThe utimer->id should be set properly before the kasprintf() function,\nensures the snd_utimer_put_id() function will free the allocated id."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "sound/core/timer.c"
                    ],
                    "versions": [
                        {
                            "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
                            "lessThan": "34327b362ce2849a5eb02f47e800049e7a20a0ba",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
                            "lessThan": "af386b52531d14c4b20f11c452787b1b6dd4eb8d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37745918e0e7575bc40f38da93a99b9fa6406224",
                            "lessThan": "5003a65790ed66be882d1987cc2ca86af0de3db1",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "sound/core/timer.c"
                    ],
                    "versions": [
                        {
                            "version": "6.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.44",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.4",
                            "lessThanOrEqual": "6.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "6.12.44"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "6.16.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12",
                                    "versionEndExcluding": "6.17"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/34327b362ce2849a5eb02f47e800049e7a20a0ba"
                },
                {
                    "url": "https://git.kernel.org/stable/c/af386b52531d14c4b20f11c452787b1b6dd4eb8d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5003a65790ed66be882d1987cc2ca86af0de3db1"
                }
            ],
            "title": "ALSA: timer: fix ida_free call while not allocated",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}