ghsa-5hgq-f2qx-82g9
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
tty: fix possible null-ptr-defer in spk_ttyio_release
Run the following tests on the qemu platform:
syzkaller:~# modprobe speakup_audptr input: Speakup as /devices/virtual/input/input4 initialized device: /dev/synth, node (MAJOR 10, MINOR 125) speakup 3.1.6: initialized synth name on entry is: (null) synth probe
spk_ttyio_initialise_ldisc failed because tty_kopen_exclusive returned failed (errno -16), then remove the module, we will get a null-ptr-defer problem, as follow:
syzkaller:~# modprobe -r speakup_audptr
releasing synth audptr
BUG: kernel NULL pointer dereference, address: 0000000000000080
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: 0002 [#1] PREEMPT SMP PTI
CPU: 2 PID: 204 Comm: modprobe Not tainted 6.1.0-rc6-dirty #1
RIP: 0010:mutex_lock+0x14/0x30
Call Trace:
in_synth->dev was not initialized during modprobe, so we add check for in_synth->dev to fix this bug.
{
"affected": [],
"aliases": [
"CVE-2022-48870"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-08-21T07:15:04Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: fix possible null-ptr-defer in spk_ttyio_release\n\nRun the following tests on the qemu platform:\n\nsyzkaller:~# modprobe speakup_audptr\n input: Speakup as /devices/virtual/input/input4\n initialized device: /dev/synth, node (MAJOR 10, MINOR 125)\n speakup 3.1.6: initialized\n synth name on entry is: (null)\n synth probe\n\nspk_ttyio_initialise_ldisc failed because tty_kopen_exclusive returned\nfailed (errno -16), then remove the module, we will get a null-ptr-defer\nproblem, as follow:\n\nsyzkaller:~# modprobe -r speakup_audptr\n releasing synth audptr\n BUG: kernel NULL pointer dereference, address: 0000000000000080\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] PREEMPT SMP PTI\n CPU: 2 PID: 204 Comm: modprobe Not tainted 6.1.0-rc6-dirty #1\n RIP: 0010:mutex_lock+0x14/0x30\n Call Trace:\n \u003cTASK\u003e\n spk_ttyio_release+0x19/0x70 [speakup]\n synth_release.part.6+0xac/0xc0 [speakup]\n synth_remove+0x56/0x60 [speakup]\n __x64_sys_delete_module+0x156/0x250\n ? fpregs_assert_state_consistent+0x1d/0x50\n do_syscall_64+0x37/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n \u003c/TASK\u003e\n Modules linked in: speakup_audptr(-) speakup\n Dumping ftrace buffer:\n\nin_synth-\u003edev was not initialized during modprobe, so we add check\nfor in_synth-\u003edev to fix this bug.",
"id": "GHSA-5hgq-f2qx-82g9",
"modified": "2024-09-06T15:32:56Z",
"published": "2024-08-21T09:31:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48870"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2da67bff29ab49caafb0766e8b8383b735ff796f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5abbeebd8296c2301023b8dc4b5a6c0d5229b4f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64152e05a4de3ebf59f1740a0985a6d5fba0c77b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
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