CVE-2022-48870— tty: fix possible null-ptr-defer in spk_ttyio_release
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I. Basic Information for CVE-2022-48870
Vulnerability Information
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Vulnerability Title
tty: fix possible null-ptr-defer in spk_ttyio_release
Source: NVD (National Vulnerability Database)
Vulnerability Description
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: <TASK> spk_ttyio_release+0x19/0x70 [speakup] synth_release.part.6+0xac/0xc0 [speakup] synth_remove+0x56/0x60 [speakup] __x64_sys_delete_module+0x156/0x250 ? fpregs_assert_state_consistent+0x1d/0x50 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Modules linked in: speakup_audptr(-) speakup Dumping ftrace buffer: in_synth->dev was not initialized during modprobe, so we add check for in_synth->dev to fix this bug.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 tty 组件在spk_ttyio_release中可能存在空指针延迟引用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2022-48870
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Same Patch Batch · Linux · 2024-08-21 · 69 CVEs total
| CVE-2022-48877 | f2fs: let's avoid panic if extent_tree is not created | |
| CVE-2024-43874 | crypto: ccp - Fix null pointer dereference in __sev_snp_shutdown_locked | |
| CVE-2024-43873 | vhost/vsock: always initialize seqpacket_allow | |
| CVE-2024-43875 | PCI: endpoint: Clean up error handling in vpci_scan_bus() | |
| CVE-2022-48871 | tty: serial: qcom-geni-serial: fix slab-out-of-bounds on RX FIFO buffer | |
| CVE-2022-48872 | misc: fastrpc: Fix use-after-free race condition for maps | |
| CVE-2022-48873 | misc: fastrpc: Don't remove map on creater_process and device_release | |
| CVE-2022-48874 | misc: fastrpc: Fix use-after-free and race in fastrpc_map_find | |
| CVE-2022-48875 | wifi: mac80211: sdata can be NULL during AMPDU start | |
| CVE-2022-48876 | wifi: mac80211: fix initialization of rx->link and rx->link_sta | |
| CVE-2022-48869 | USB: gadgetfs: Fix race between mounting and unmounting | |
| CVE-2022-48878 | Bluetooth: hci_qca: Fix driver shutdown on closed serdev | |
| CVE-2022-48879 | efi: fix NULL-deref in init error path | |
| CVE-2022-48880 | platform/surface: aggregator: Add missing call to ssam_request_sync_free() | |
| CVE-2022-48881 | platform/x86/amd: Fix refcount leak in amd_pmc_probe | |
| CVE-2022-48882 | net/mlx5e: Fix macsec possible null dereference when updating MAC security entity (SecY) | |
| CVE-2022-48883 | net/mlx5e: IPoIB, Block PKEY interfaces with less rx queues than parent | |
| CVE-2022-48884 | net/mlx5: Fix command stats access after free | |
| CVE-2022-48885 | ice: Fix potential memory leak in ice_gnss_tty_write() | |
| CVE-2022-48886 | ice: Add check for kzalloc |
Showing top 20 of 69 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
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scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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