CVE-2021-47117— ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed
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I. Basic Information for CVE-2021-47117
Vulnerability Information
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Vulnerability Title
ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed We got follow bug_on when run fsstress with injecting IO fault: [130747.323114] kernel BUG at fs/ext4/extents_status.c:762! [130747.323117] Internal error: Oops - BUG: 0 [#1] SMP ...... [130747.334329] Call trace: [130747.334553] ext4_es_cache_extent+0x150/0x168 [ext4] [130747.334975] ext4_cache_extents+0x64/0xe8 [ext4] [130747.335368] ext4_find_extent+0x300/0x330 [ext4] [130747.335759] ext4_ext_map_blocks+0x74/0x1178 [ext4] [130747.336179] ext4_map_blocks+0x2f4/0x5f0 [ext4] [130747.336567] ext4_mpage_readpages+0x4a8/0x7a8 [ext4] [130747.336995] ext4_readpage+0x54/0x100 [ext4] [130747.337359] generic_file_buffered_read+0x410/0xae8 [130747.337767] generic_file_read_iter+0x114/0x190 [130747.338152] ext4_file_read_iter+0x5c/0x140 [ext4] [130747.338556] __vfs_read+0x11c/0x188 [130747.338851] vfs_read+0x94/0x150 [130747.339110] ksys_read+0x74/0xf0 This patch's modification is according to Jan Kara's suggestion in: https://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/ "I see. Now I understand your patch. Honestly, seeing how fragile is trying to fix extent tree after split has failed in the middle, I would probably go even further and make sure we fix the tree properly in case of ENOSPC and EDQUOT (those are easily user triggerable). Anything else indicates a HW problem or fs corruption so I'd rather leave the extent tree as is and don't try to fix it (which also means we will not create overlapping extents)."
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 模块的 ext4_es_cache_extent 方法中存在错误。
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-2021-47117
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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-2021-47116 | ext4: fix memory leak in ext4_mb_init_backend on error path. |
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-2021-47117
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