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CVE-2022-50409— net: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory

EPSS 0.01% · P3
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I. Basic Information for CVE-2022-50409

Vulnerability Information
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Vulnerability Title
net: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory Fixes the below NULL pointer dereference: [...] [ 14.471200] Call Trace: [ 14.471562] <TASK> [ 14.471882] lock_acquire+0x245/0x2e0 [ 14.472416] ? remove_wait_queue+0x12/0x50 [ 14.473014] ? _raw_spin_lock_irqsave+0x17/0x50 [ 14.473681] _raw_spin_lock_irqsave+0x3d/0x50 [ 14.474318] ? remove_wait_queue+0x12/0x50 [ 14.474907] remove_wait_queue+0x12/0x50 [ 14.475480] sk_stream_wait_memory+0x20d/0x340 [ 14.476127] ? do_wait_intr_irq+0x80/0x80 [ 14.476704] do_tcp_sendpages+0x287/0x600 [ 14.477283] tcp_bpf_push+0xab/0x260 [ 14.477817] tcp_bpf_sendmsg_redir+0x297/0x500 [ 14.478461] ? __local_bh_enable_ip+0x77/0xe0 [ 14.479096] tcp_bpf_send_verdict+0x105/0x470 [ 14.479729] tcp_bpf_sendmsg+0x318/0x4f0 [ 14.480311] sock_sendmsg+0x2d/0x40 [ 14.480822] ____sys_sendmsg+0x1b4/0x1c0 [ 14.481390] ? copy_msghdr_from_user+0x62/0x80 [ 14.482048] ___sys_sendmsg+0x78/0xb0 [ 14.482580] ? vmf_insert_pfn_prot+0x91/0x150 [ 14.483215] ? __do_fault+0x2a/0x1a0 [ 14.483738] ? do_fault+0x15e/0x5d0 [ 14.484246] ? __handle_mm_fault+0x56b/0x1040 [ 14.484874] ? lock_is_held_type+0xdf/0x130 [ 14.485474] ? find_held_lock+0x2d/0x90 [ 14.486046] ? __sys_sendmsg+0x41/0x70 [ 14.486587] __sys_sendmsg+0x41/0x70 [ 14.487105] ? intel_pmu_drain_pebs_core+0x350/0x350 [ 14.487822] do_syscall_64+0x34/0x80 [ 14.488345] entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] The test scenario has the following flow: thread1 thread2 ----------- --------------- tcp_bpf_sendmsg tcp_bpf_send_verdict tcp_bpf_sendmsg_redir sock_close tcp_bpf_push_locked __sock_release tcp_bpf_push //inet_release do_tcp_sendpages sock->ops->release sk_stream_wait_memory // tcp_close sk_wait_event sk->sk_prot->close release_sock(__sk); *** lock_sock(sk); __tcp_close sock_orphan(sk) sk->sk_wq = NULL release_sock **** lock_sock(__sk); remove_wait_queue(sk_sleep(sk), &wait); sk_sleep(sk) //NULL pointer dereference &rcu_dereference_raw(sk->sk_wq)->wait While waiting for memory in thread1, the socket is released with its wait queue because thread2 has closed it. This caused by tcp_bpf_send_verdict didn't increase the f_count of psock->sk_redir->sk_socket->file in thread1. We should check if SOCK_DEAD flag is set on wakeup in sk_stream_wait_memory before accessing the wait queue.
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，该漏洞源于未正确处理死亡套接字的sk_wq访问，可能导致空指针取消引用。
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 604326b41a6fb9b4a78b6179335decee0365cd8c ~ a76462dbdd8bddcbeec9463bc9e54e509b860762 -
LinuxLinux 4.20 -

II. Public POCs for CVE-2022-50409

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III. Intelligence Information for CVE-2022-50409

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Same Patch Batch · Linux · 2025-09-18 · 121 CVEs total

CVE-2022-50402drivers/md/md-bitmap: check the return value of md_bitmap_get_counter()
CVE-2022-50418wifi: ath11k: mhi: fix potential memory leak in ath11k_mhi_register()
CVE-2022-50417drm/panfrost: Fix GEM handle creation ref-counting
CVE-2022-50416irqchip/wpcm450: Fix memory leak in wpcm450_aic_of_init()
CVE-2022-50415parisc: led: Fix potential null-ptr-deref in start_task()
CVE-2022-50414scsi: fcoe: Fix transport not deattached when fcoe_if_init() fails
CVE-2022-50413wifi: mac80211: fix use-after-free
CVE-2022-50412drm: bridge: adv7511: unregister cec i2c device after cec adapter
CVE-2022-50411ACPICA: Fix error code path in acpi_ds_call_control_method()
CVE-2022-50410NFSD: Protect against send buffer overflow in NFSv2 READ
CVE-2022-50407crypto: hisilicon/qm - increase the memory of local variables
CVE-2022-50408wifi: brcmfmac: fix use-after-free bug in brcmf_netdev_start_xmit()
CVE-2022-50406iomap: iomap: fix memory corruption when recording errors during writeback
CVE-2022-50404fbdev: fbcon: release buffer when fbcon_do_set_font() failed
CVE-2022-50405net/tunnel: wait until all sk_user_data reader finish before releasing the sock
CVE-2023-53409drivers: base: component: fix memory leak with using debugfs_lookup()
CVE-2023-53412USB: gadget: bcm63xx_udc: fix memory leak with using debugfs_lookup()
CVE-2023-53411PM: EM: fix memory leak with using debugfs_lookup()
CVE-2023-53410USB: ULPI: fix memory leak with using debugfs_lookup()
CVE-2023-53407USB: gadget: pxa27x_udc: fix memory leak with using debugfs_lookup()

Showing top 20 of 121 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-50409

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