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CVE-2022-50286— ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline

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_clu_mapped函数在bigalloc和inline选项同时启用时错误搜索不存在的extent树，可能导致无效的extent状态缓存、错误的保留集群计数、内存泄漏和内核崩溃。

CVSS 7.8 · High EPSS 0.17% · P6

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux d40e09f701cf7a44e595a558b067b2b4f67fbf87< f83391339d8493b9ff24167516aaa5a5e88d8f81 affected
0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6< 6f4200ec76a0d31200c308ec5a71c68df5417004 affected
0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6< 9404839e0c9db5a517ea83c0ca3388b39d105fdf affected
0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6< d440d6427a5e3a877c1c259b8d2b216ddb65e185 affected
0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6< c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193 affected
0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6< 81b915181c630ee1cffa052e52874fe4e1ba91ac affected
0b02f4c0d6d9e2c611dfbdd4317193e9dca740e6< 131294c35ed6f777bd4e79d42af13b5c41bf2775 affected
4.19.270< 4.19.271 affected
… +9 more rows
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I. Basic Information for CVE-2022-50286

Vulnerability Information
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Vulnerability Title
ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix delayed allocation bug in ext4_clu_mapped for bigalloc + inline When converting files with inline data to extents, delayed allocations made on a file system created with both the bigalloc and inline options can result in invalid extent status cache content, incorrect reserved cluster counts, kernel memory leaks, and potential kernel panics. With bigalloc, the code that determines whether a block must be delayed allocated searches the extent tree to see if that block maps to a previously allocated cluster. If not, the block is delayed allocated, and otherwise, it isn't. However, if the inline option is also used, and if the file containing the block is marked as able to store data inline, there isn't a valid extent tree associated with the file. The current code in ext4_clu_mapped() calls ext4_find_extent() to search the non-existent tree for a previously allocated cluster anyway, which typically finds nothing, as desired. However, a side effect of the search can be to cache invalid content from the non-existent tree (garbage) in the extent status tree, including bogus entries in the pending reservation tree. To fix this, avoid searching the extent tree when allocating blocks for bigalloc + inline files that are being converted from inline to extent mapped.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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_clu_mapped函数在bigalloc和inline选项同时启用时错误搜索不存在的extent树，可能导致无效的extent状态缓存、错误的保留集群计数、内存泄漏和内核崩溃。
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 d40e09f701cf7a44e595a558b067b2b4f67fbf87 ~ f83391339d8493b9ff24167516aaa5a5e88d8f81 -
Linux Linux 4.20 -

II. Public POCs for CVE-2022-50286

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III. Intelligence Information for CVE-2022-50286

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Same Patch Batch · Linux · 2025-09-15 · 210 CVEs total

CVE-2022-50235 9.8 CRITICAL NFSD: Protect against send buffer overflow in NFSv2 READDIR
CVE-2022-50335 9.8 CRITICAL 9p: set req refcount to zero to avoid uninitialized usage
CVE-2023-53192 9.8 CRITICAL vxlan: Fix nexthop hash size
CVE-2023-53253 8.8 HIGH HID: nvidia-shield: Reference hid_device devm allocation of input_dev name
CVE-2023-53226 8.8 HIGH wifi: mwifiex: Fix OOB and integer underflow when rx packets
CVE-2022-50241 8.8 HIGH NFSD: fix use-after-free on source server when doing inter-server copy
CVE-2023-53194 8.4 HIGH fs/ntfs3: Add length check in indx_get_root
CVE-2023-53213 8.1 HIGH wifi: brcmfmac: slab-out-of-bounds read in brcmf_get_assoc_ies()
CVE-2023-53186 8.1 HIGH skbuff: Fix a race between coalescing and releasing SKBs
CVE-2022-50310 7.8 HIGH ip6mr: fix UAF issue in ip6mr_sk_done() when addrconf_init_net() failed
CVE-2023-53254 7.8 HIGH cacheinfo: Fix shared_cpu_map to handle shared caches at different levels
CVE-2023-53252 7.8 HIGH Bluetooth: use RCU for hci_conn_params and iterate safely in hci_sync
CVE-2023-53170 7.8 HIGH net: dsa: Removed unneeded of_node_put in felix_parse_ports_node
CVE-2023-53176 7.8 HIGH serial: 8250: Reinit port->pm on port specific driver unbind
CVE-2023-53178 7.8 HIGH mm: fix zswap writeback race condition
CVE-2023-53179 7.8 HIGH netfilter: ipset: add the missing IP_SET_HASH_WITH_NET0 macro for ip_set_hash_netportnet.c
CVE-2023-53184 7.8 HIGH arm64/sme: Set new vector length before reallocating
CVE-2022-50315 7.8 HIGH ata: ahci: Match EM_MAX_SLOTS with SATA_PMP_MAX_PORTS
CVE-2025-39800 7.8 HIGH btrfs: abort transaction on unexpected eb generation at btrfs_copy_root()
CVE-2022-50283 7.8 HIGH mtd: core: add missing of_node_get() in dynamic partitions code

Showing top 20 of 210 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-50286

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