CVE-2022-50344— ext4: fix null-ptr-deref in ext4_write_info
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I. Basic Information for CVE-2022-50344
Vulnerability Information
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Vulnerability Title
ext4: fix null-ptr-deref in ext4_write_info
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix null-ptr-deref in ext4_write_info I caught a null-ptr-deref bug as follows: ================================================================== KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 1 PID: 1589 Comm: umount Not tainted 5.10.0-02219-dirty #339 RIP: 0010:ext4_write_info+0x53/0x1b0 [...] Call Trace: dquot_writeback_dquots+0x341/0x9a0 ext4_sync_fs+0x19e/0x800 __sync_filesystem+0x83/0x100 sync_filesystem+0x89/0xf0 generic_shutdown_super+0x79/0x3e0 kill_block_super+0xa1/0x110 deactivate_locked_super+0xac/0x130 deactivate_super+0xb6/0xd0 cleanup_mnt+0x289/0x400 __cleanup_mnt+0x16/0x20 task_work_run+0x11c/0x1c0 exit_to_user_mode_prepare+0x203/0x210 syscall_exit_to_user_mode+0x5b/0x3a0 do_syscall_64+0x59/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xa9 ================================================================== Above issue may happen as follows: ------------------------------------- exit_to_user_mode_prepare task_work_run __cleanup_mnt cleanup_mnt deactivate_super deactivate_locked_super kill_block_super generic_shutdown_super shrink_dcache_for_umount dentry = sb->s_root sb->s_root = NULL <--- Here set NULL sync_filesystem __sync_filesystem sb->s_op->sync_fs > ext4_sync_fs dquot_writeback_dquots sb->dq_op->write_info > ext4_write_info ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2) d_inode(sb->s_root) s_root->d_inode <--- Null pointer dereference To solve this problem, we use ext4_journal_start_sb directly to avoid s_root being used.
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ext4_write_info中存在空指针取消引用。
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
II. Public POCs for CVE-2022-50344
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Same Patch Batch · Linux · 2025-09-16 · 115 CVEs total
| CVE-2022-50339 | Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev() | |
| CVE-2023-53307 | rbd: avoid use-after-free in do_rbd_add() when rbd_dev_create() fails | |
| CVE-2023-53305 | Bluetooth: L2CAP: Fix use-after-free | |
| CVE-2023-53304 | netfilter: nft_set_rbtree: fix overlap expiration walk | |
| CVE-2022-50351 | cifs: Fix xid leak in cifs_create() | |
| CVE-2022-50352 | net: hns: fix possible memory leak in hnae_ae_register() | |
| CVE-2022-50350 | scsi: target: iscsi: Fix a race condition between login_work and the login thread | |
| CVE-2022-50348 | nfsd: Fix a memory leak in an error handling path | |
| CVE-2022-50349 | misc: tifm: fix possible memory leak in tifm_7xx1_switch_media() | |
| CVE-2022-50347 | mmc: rtsx_usb_sdmmc: fix return value check of mmc_add_host() | |
| CVE-2022-50346 | ext4: init quota for 'old.inode' in 'ext4_rename' | |
| CVE-2022-50343 | rapidio: fix possible name leaks when rio_add_device() fails | |
| CVE-2022-50342 | floppy: Fix memory leak in do_floppy_init() | |
| CVE-2022-50341 | cifs: fix oops during encryption | |
| CVE-2022-50340 | media: vimc: Fix wrong function called when vimc_init() fails | |
| CVE-2025-39826 | net: rose: convert 'use' field to refcount_t | |
| CVE-2025-39829 | trace/fgraph: Fix the warning caused by missing unregister notifier | |
| CVE-2025-39828 | atm: atmtcp: Prevent arbitrary write in atmtcp_recv_control(). | |
| CVE-2025-39827 | net: rose: include node references in rose_neigh refcount | |
| CVE-2025-39830 | net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path |
Showing top 20 of 115 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- 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 - CVE-2026-43471
scsi: ufs: core: Fix possible NULL pointer dereference in uf
Same vendor: Linux
- 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 - CVE-2026-43471
scsi: ufs: core: Fix possible NULL pointer dereference in uf
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