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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.5 Difficulty: Easy EPSS 0.27% · P19

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux a42afc5f56f319107e987aa6adf2f65d93d527c7< 5db60e76edf5680ff1f3a7221036fc44b308f146 affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< d666dfaa571465a19f014534a214c255ea33f301 affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 0d3a6926f7e8be3c897fa46216ce13b119a9f56a affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 5a016c053f426a73752c3b41b60b497b58694d48 affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 330d0e44fc5a47c27df958ecdd4693a3cb1d8b81 affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< a0856764dc1276ad2dc7891288c2e9246bf11a37 affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 343117559ef41e992e326f7a92da1a8f254dfa8c affected
a42afc5f56f319107e987aa6adf2f65d93d527c7< 677c9d30e8487bee6c8e3b034070319d98f6e203 affected
… +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: CVE Program / CVE List V5
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: 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

Vendor Product Affected Versions CPE Subscribe
Linux Linux a42afc5f56f319107e987aa6adf2f65d93d527c7 ~ 5db60e76edf5680ff1f3a7221036fc44b308f146 -
Linux Linux 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-2022-49149 9.8 CRITICAL rxrpc: Fix call timer start racing with call destruction
CVE-2022-49280 9.8 CRITICAL NFSD: prevent underflow in nfssvc_decode_writeargs()
CVE-2022-49561 9.8 CRITICAL netfilter: conntrack: re-fetch conntrack after insertion
CVE-2022-49407 9.8 CRITICAL dlm: fix plock invalid read
CVE-2022-49094 9.8 CRITICAL net/tls: fix slab-out-of-bounds bug in decrypt_internal
CVE-2022-49362 9.8 CRITICAL NFSD: Fix potential use-after-free in nfsd_file_put()
CVE-2022-49093 9.8 CRITICAL skbuff: fix coalescing for page_pool fragment recycling
CVE-2022-49194 9.8 CRITICAL net: bcmgenet: Use stronger register read/writes to assure ordering
CVE-2022-49356 9.8 CRITICAL SUNRPC: Trap RDMA segment overflows
CVE-2022-49418 9.8 CRITICAL NFSv4: Fix free of uninitialized nfs4_label on referral lookup.
CVE-2022-49201 9.8 CRITICAL ibmvnic: fix race between xmit and reset
CVE-2022-49260 9.8 CRITICAL crypto: hisilicon/sec - fix the aead software fallback for engine
CVE-2022-49058 9.1 CRITICAL cifs: potential buffer overflow in handling symlinks
CVE-2022-49519 8.8 HIGH ath10k: skip ath10k_halt during suspend for driver state RESTARTING
CVE-2022-49111 8.8 HIGH Bluetooth: Fix use after free in hci_send_acl
CVE-2022-49535 8.8 HIGH scsi: lpfc: Fix null pointer dereference after failing to issue FLOGI and PLOGI
CVE-2022-49138 8.8 HIGH Bluetooth: hci_event: Ignore multiple conn complete events
CVE-2022-49479 8.8 HIGH mt76: fix tx status related use-after-free race on station removal
CVE-2022-49114 8.8 HIGH scsi: libfc: Fix use after free in fc_exch_abts_resp()
CVE-2022-49328 8.8 HIGH mt76: fix use-after-free by removing a non-RCU wcid pointer

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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