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CVE-2022-49171— ext4: don't BUG if someone dirty pages without asking ext4 first

AI Predicted 5.5 Difficulty: Easy EPSS 0.01% · P0

Affected Version Matrix 20

VendorProductVersion RangeStatus
LinuxLinuxa42afc5f56f319107e987aa6adf2f65d93d527c7< 5db60e76edf5680ff1f3a7221036fc44b308f146affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< d666dfaa571465a19f014534a214c255ea33f301affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 0d3a6926f7e8be3c897fa46216ce13b119a9f56aaffected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 5a016c053f426a73752c3b41b60b497b58694d48affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 330d0e44fc5a47c27df958ecdd4693a3cb1d8b81affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< a0856764dc1276ad2dc7891288c2e9246bf11a37affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 343117559ef41e992e326f7a92da1a8f254dfa8caffected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 677c9d30e8487bee6c8e3b034070319d98f6e203affected
… +12 more rows
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I. Basic Information for CVE-2022-49171

Vulnerability Information
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Vulnerability Title
ext4: don't BUG if someone dirty pages without asking ext4 first
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: don't BUG if someone dirty pages without asking ext4 first [un]pin_user_pages_remote is dirtying pages without properly warning the file system in advance. A related race was noted by Jan Kara in 2018[1]; however, more recently instead of it being a very hard-to-hit race, it could be reliably triggered by process_vm_writev(2) which was discovered by Syzbot[2]. This is technically a bug in mm/gup.c, but arguably ext4 is fragile in that if some other kernel subsystem dirty pages without properly notifying the file system using page_mkwrite(), ext4 will BUG, while other file systems will not BUG (although data will still be lost). So instead of crashing with a BUG, issue a warning (since there may be potential data loss) and just mark the page as clean to avoid unprivileged denial of service attacks until the problem can be properly fixed. More discussion and background can be found in the thread starting at [2]. [1] https://lore.kernel.org/linux-mm/20180103100430.GE4911@quack2.suse.cz [2] https://lore.kernel.org/r/Yg0m6IjcNmfaSokM@google.com
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驱动在未通知文件系统的情况下脏页时触发BUG，可能导致数据丢失。
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 a42afc5f56f319107e987aa6adf2f65d93d527c7 ~ 5db60e76edf5680ff1f3a7221036fc44b308f146 -
LinuxLinux 2.6.37 -

II. Public POCs for CVE-2022-49171

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III. Intelligence Information for CVE-2022-49171

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Patches & Fixes for CVE-2022-49171 (9)

Same Patch Batch · Linux · 2025-02-26 · 706 CVEs total

CVE-2022-49498ALSA: pcm: Check for null pointer of pointer substream before dereferencing it
CVE-2022-49486ASoC: fsl: Fix refcount leak in imx_sgtl5000_probe
CVE-2022-49488drm/msm/mdp5: Return error code in mdp5_mixer_release when deadlock is detected
CVE-2022-49489drm/msm/disp/dpu1: set vbif hw config to NULL to avoid use after memory free during pm run
CVE-2022-49490drm/msm/mdp5: Return error code in mdp5_pipe_release when deadlock is detected
CVE-2022-49491drm/rockchip: vop: fix possible null-ptr-deref in vop_bind()
CVE-2022-49492nvme-pci: fix a NULL pointer dereference in nvme_alloc_admin_tags
CVE-2022-49493ASoC: rt5645: Fix errorenous cleanup order
CVE-2022-49494mtd: rawnand: cadence: fix possible null-ptr-deref in cadence_nand_dt_probe()
CVE-2022-49495drm/msm/hdmi: check return value after calling platform_get_resource_byname()
CVE-2022-49497net: remove two BUG() from skb_checksum_help()
CVE-2022-49496media: mediatek: vcodec: prevent kernel crash when rmmod mtk-vcodec-dec.ko
CVE-2022-49502media: rga: fix possible memory leak in rga_probe
CVE-2022-49507regulator: da9121: Fix uninit-value in da9121_assign_chip_model()
CVE-2022-49508HID: elan: Fix potential double free in elan_input_configured
CVE-2022-49506drm/mediatek: Add vblank register/unregister callback functions
CVE-2022-49504scsi: lpfc: Inhibit aborts if external loopback plug is inserted
CVE-2022-49505NFC: NULL out the dev->rfkill to prevent UAF
CVE-2022-49501usbnet: Run unregister_netdev() before unbind() again
CVE-2022-49500wl1251: dynamically allocate memory used for DMA

Showing top 20 of 706 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-49171

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