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CVE-2021-47117— ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed

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_es_cache_extent 方法中存在错误。

AI Predicted 4.0 Difficulty: Hard EPSS 0.24% · P14

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux adb2355104b2109e06ba5276485d187d023b2fd2< e33bafad30d34cfa5e9787cb099cab05e2677fcb affected
adb2355104b2109e06ba5276485d187d023b2fd2< 5b3a9a2be59478b013a430ac57b0f3d65471b071 affected
adb2355104b2109e06ba5276485d187d023b2fd2< d8116743ef5432336289256b2f7c117299213eb9 affected
adb2355104b2109e06ba5276485d187d023b2fd2< 569496aa3776eea1ff0d49d0174ac1b7e861e107 affected
adb2355104b2109e06ba5276485d187d023b2fd2< 920697b004e49cb026e2e15fe91be065bf0741b7 affected
adb2355104b2109e06ba5276485d187d023b2fd2< d3b668b96ad3192c0581a248ae2f596cd054792a affected
adb2355104b2109e06ba5276485d187d023b2fd2< 48105dc98c9ca35af418746277b087cb2bc6df7c affected
adb2355104b2109e06ba5276485d187d023b2fd2< 082cd4ec240b8734a82a89ffb890216ac98fec68 affected
… +10 more rows
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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: CVE Program / CVE List V5
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: 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_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

Vendor Product Affected Versions CPE Subscribe
Linux Linux adb2355104b2109e06ba5276485d187d023b2fd2 ~ e33bafad30d34cfa5e9787cb099cab05e2677fcb -
Linux Linux 3.9 -

II. Public POCs for CVE-2021-47117

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III. Intelligence Information for CVE-2021-47117

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Other References for CVE-2021-47117 (8)

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-2021-47117

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