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CVE-2022-48870— tty: fix possible null-ptr-defer in spk_ttyio_release

AI Predicted 5.9 Difficulty: Moderate EPSS 0.25% · P16

Possible ATT&CK Techniques 1AI

T1211 · Exploitation for Stealth

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux4f2a81f3a88217e7340b2cab5c0a5ebd0112514c< 2da67bff29ab49caafb0766e8b8383b735ff796faffected
4f2a81f3a88217e7340b2cab5c0a5ebd0112514c< 64152e05a4de3ebf59f1740a0985a6d5fba0c77baffected
4f2a81f3a88217e7340b2cab5c0a5ebd0112514c< 5abbeebd8296c2301023b8dc4b5a6c0d5229b4f5affected
5.12affected
< 5.12unaffected
5.15.90≤ 5.15.*unaffected
6.1.8≤ 6.1.*unaffected
6.2≤ *unaffected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4f2a81f3a88217e7340b2cab5c0a5ebd0112514c ~ 2da67bff29ab49caafb0766e8b8383b735ff796f -
LinuxLinux 5.12 -

II. Public POCs for CVE-2022-48870

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III. Intelligence Information for CVE-2022-48870

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Other References for CVE-2022-48870 (3)

Same Patch Batch · Linux · 2024-08-21 · 69 CVEs total

CVE-2023-529108.8 HIGHiommu/iova: Fix alloc iova overflows issue
CVE-2024-438818.8 HIGHwifi: ath12k: change DMA direction while mapping reinjected packets
CVE-2022-488718.8 HIGHtty: serial: qcom-geni-serial: fix slab-out-of-bounds on RX FIFO buffer
CVE-2024-438788.1 HIGHxfrm: Fix input error path memory access
CVE-2024-438777.8 HIGHmedia: pci: ivtv: Add check for DMA map result
CVE-2023-529077.8 HIGHnfc: pn533: Wait for out_urb's completion in pn533_usb_send_frame()
CVE-2023-529037.8 HIGHio_uring: lock overflowing for IOPOLL
CVE-2022-488997.8 HIGHdrm/virtio: Fix GEM handle creation UAF
CVE-2022-488927.8 HIGHsched/core: Fix use-after-free bug in dup_user_cpus_ptr()
CVE-2022-488877.8 HIGHdrm/vmwgfx: Remove rcu locks from user resources
CVE-2022-488837.8 HIGHnet/mlx5e: IPoIB, Block PKEY interfaces with less rx queues than parent
CVE-2022-488787.8 HIGHBluetooth: hci_qca: Fix driver shutdown on closed serdev
CVE-2022-488747.8 HIGHmisc: fastrpc: Fix use-after-free and race in fastrpc_map_find
CVE-2022-488737.8 HIGHmisc: fastrpc: Don't remove map on creater_process and device_release
CVE-2022-488727.8 HIGHmisc: fastrpc: Fix use-after-free race condition for maps
CVE-2024-438827.8 HIGHexec: Fix ToCToU between perm check and set-uid/gid usage
CVE-2024-438807.8 HIGHmlxsw: spectrum_acl_erp: Fix object nesting warning
CVE-2023-529137.8 HIGHdrm/i915: Fix potential context UAFs
CVE-2023-529097.5 HIGHnfsd: fix handling of cached open files in nfsd4_open codepath
CVE-2024-438727.5 HIGHRDMA/hns: Fix soft lockup under heavy CEQE load

Showing top 20 of 69 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-48870

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