CVE-2021-47114— ocfs2: fix data corruption by fallocate
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I. Basic Information for CVE-2021-47114
Vulnerability Information
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Vulnerability Title
ocfs2: fix data corruption by fallocate
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix data corruption by fallocate When fallocate punches holes out of inode size, if original isize is in the middle of last cluster, then the part from isize to the end of the cluster will be zeroed with buffer write, at that time isize is not yet updated to match the new size, if writeback is kicked in, it will invoke ocfs2_writepage()->block_write_full_page() where the pages out of inode size will be dropped. That will cause file corruption. Fix this by zero out eof blocks when extending the inode size. Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily. qemu-img convert -p -t none -T none -f qcow2 $qcow_image \ -O qcow2 -o compat=1.1 $qcow_image.conv The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size. fallocate(11, FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0 fallocate(11, 0, 2276196352, 65536) = 0 v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/
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 ocfs2 模块的 fallocate 会造成数据损坏。
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-2021-47114
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Same Patch Batch · Linux · 2024-03-15 · 26 CVEs total
| CVE-2021-47123 | io_uring: fix ltout double free on completion race | |
| CVE-2021-47135 | mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report | |
| 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-2021-47132 | mptcp: fix sk_forward_memory corruption on retransmission | |
| CVE-2021-47131 | net/tls: Fix use-after-free after the TLS device goes down and up | |
| CVE-2021-47130 | nvmet: fix freeing unallocated p2pmem | |
| CVE-2021-47129 | netfilter: nft_ct: skip expectations for confirmed conntrack | |
| CVE-2021-47128 | bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks | |
| CVE-2021-47127 | ice: track AF_XDP ZC enabled queues in bitmap | |
| CVE-2021-47126 | ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions | |
| CVE-2021-47125 | sch_htb: fix refcount leak in htb_parent_to_leaf_offload | |
| CVE-2021-47124 | io_uring: fix link timeout refs | |
| CVE-2021-47109 | neighbour: allow NUD_NOARP entries to be forced GCed | |
| CVE-2021-47122 | net: caif: fix memory leak in caif_device_notify | |
| CVE-2021-47121 | net: caif: fix memory leak in cfusbl_device_notify | |
| CVE-2021-47120 | HID: magicmouse: fix NULL-deref on disconnect | |
| CVE-2021-47119 | ext4: fix memory leak in ext4_fill_super | |
| CVE-2021-47118 | pid: take a reference when initializing `cad_pid` | |
| CVE-2021-47117 | ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed |
Showing top 20 of 26 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - 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
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - 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
V. Comments for CVE-2021-47114
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