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CVE-2021-47116— ext4: fix memory leak in ext4_mb_init_backend on error path.

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 模块的 ext4_mb_init_backend 方法中存在内存泄漏。

AI Predicted 3.7 Difficulty: Easy EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux df61d3cff422433527d3bc388f69484f0781d226< 2050c6e5b161e5e25ce3c420fef58b24fa388a49 affected
f91436d55a279f045987e8b8c1385585dca54be9< 04fb2baa0b147f51db065a1b13a11954abe592d0 affected
f91436d55a279f045987e8b8c1385585dca54be9< a8867f4e3809050571c98de7a2d465aff5e4daf5 affected
9e7af67e9521fb5cbb5b01aca22921c313c2e48e affected
5.10.27< 5.10.43 affected
5.11.11< 5.12 affected
5.12 affected
< 5.12 unaffected
… +3 more rows
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I. Basic Information for CVE-2021-47116

Vulnerability Information
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Vulnerability Title
ext4: fix memory leak in ext4_mb_init_backend on error path.
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_mb_init_backend on error path. Fix a memory leak discovered by syzbot when a file system is corrupted with an illegally large s_log_groups_per_flex.
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 模块的 ext4_mb_init_backend 方法中存在内存泄漏。
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 df61d3cff422433527d3bc388f69484f0781d226 ~ 2050c6e5b161e5e25ce3c420fef58b24fa388a49 -
Linux Linux 5.12 -

II. Public POCs for CVE-2021-47116

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III. Intelligence Information for CVE-2021-47116

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Other References for CVE-2021-47116 (3)

Same Patch Batch · Linux · 2024-03-15 · 26 CVEs total

CVE-2021-47111 8.8 HIGH xen-netback: take a reference to the RX task thread
CVE-2021-47131 8.1 HIGH net/tls: Fix use-after-free after the TLS device goes down and up
CVE-2021-47123 7.8 HIGH io_uring: fix ltout double free on completion race
CVE-2021-47135 7.8 HIGH mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report
CVE-2021-47129 7.8 HIGH netfilter: nft_ct: skip expectations for confirmed conntrack
CVE-2021-47126 7.8 HIGH ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions
CVE-2021-47124 7.8 HIGH io_uring: fix link timeout refs
CVE-2021-47112 7.8 HIGH x86/kvm: Teardown PV features on boot CPU as well
CVE-2021-47132 7.5 HIGH mptcp: fix sk_forward_memory corruption on retransmission
CVE-2021-47109 7.5 HIGH neighbour: allow NUD_NOARP entries to be forced GCed
CVE-2021-47130 7.5 HIGH nvmet: fix freeing unallocated p2pmem
CVE-2021-47113 7.1 HIGH btrfs: abort in rename_exchange if we fail to insert the second ref
CVE-2021-47127 ice: track AF_XDP ZC enabled queues in bitmap
CVE-2021-47110 x86/kvm: Disable kvmclock on all CPUs on shutdown
CVE-2021-47134 efi/fdt: fix panic when no valid fdt found
CVE-2021-47133 HID: amd_sfh: Fix memory leak in amd_sfh_work
CVE-2021-47128 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks
CVE-2021-47118 pid: take a reference when initializing `cad_pid`
CVE-2021-47114 ocfs2: fix data corruption by fallocate
CVE-2021-47125 sch_htb: fix refcount leak in htb_parent_to_leaf_offload

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47116

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