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CVE-2023-53503— ext4: allow ext4_get_group_info() to fail

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，该漏洞源于恶意攻击者可能通过修改超级块触发整数下溢，可能导致拒绝服务攻击。

AI Predicted 7.8 Difficulty: Hard EPSS 0.16% · P5

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 2f2e09eb15849562aede80ed007658e4504ded26< 100c0ad6c04597fefeaaba2bb1827cc015d95067 affected
2f2e09eb15849562aede80ed007658e4504ded26< 620a3c28221bb219b81bc0bffd065cc187494302 affected
2f2e09eb15849562aede80ed007658e4504ded26< b4319e457d6e3fb33e443efeaf4634fc36e8a9ed affected
2f2e09eb15849562aede80ed007658e4504ded26< 31668cebf45adfb6283e465e641c4f5a21b07afa affected
2f2e09eb15849562aede80ed007658e4504ded26< 5354b2af34064a4579be8bc0e2f15a7b70f14b5f affected
3.11 affected
< 3.11 unaffected
5.10.181≤ 5.10.* unaffected
… +4 more rows
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I. Basic Information for CVE-2023-53503

Vulnerability Information
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Vulnerability Title
ext4: allow ext4_get_group_info() to fail
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: allow ext4_get_group_info() to fail Previously, ext4_get_group_info() would treat an invalid group number as BUG(), since in theory it should never happen. However, if a malicious attaker (or fuzzer) modifies the superblock via the block device while it is the file system is mounted, it is possible for s_first_data_block to get set to a very large number. In that case, when calculating the block group of some block number (such as the starting block of a preallocation region), could result in an underflow and very large block group number. Then the BUG_ON check in ext4_get_group_info() would fire, resutling in a denial of service attack that can be triggered by root or someone with write access to the block device. For a quality of implementation perspective, it's best that even if the system administrator does something that they shouldn't, that it will not trigger a BUG. So instead of BUG'ing, ext4_get_group_info() will call ext4_error and return NULL. We also add fallback code in all of the callers of ext4_get_group_info() that it might NULL. Also, since ext4_get_group_info() was already borderline to be an inline function, un-inline it. The results in a next reduction of the compiled text size of ext4 by roughly 2k.
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，该漏洞源于恶意攻击者可能通过修改超级块触发整数下溢，可能导致拒绝服务攻击。
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 2f2e09eb15849562aede80ed007658e4504ded26 ~ 100c0ad6c04597fefeaaba2bb1827cc015d95067 -
Linux Linux 3.11 -

II. Public POCs for CVE-2023-53503

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III. Intelligence Information for CVE-2023-53503

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Same Patch Batch · Linux · 2025-10-01 · 169 CVEs total

CVE-2023-53517 9.8 CRITICAL tipc: do not update mtu if msg_max is too small in mtu negotiation
CVE-2023-53454 8.8 HIGH HID: multitouch: Correct devm device reference for hidinput input_dev name
CVE-2025-39918 8.8 HIGH wifi: mt76: fix linked list corruption
CVE-2025-39919 8.8 HIGH wifi: mt76: mt7996: add missing check for rx wcid entries
CVE-2022-50442 8.4 HIGH fs/ntfs3: Validate buffer length while parsing index
CVE-2023-53493 8.4 HIGH accel/qaic: tighten bounds checking in decode_message()
CVE-2022-50421 7.8 HIGH rpmsg: char: Avoid double destroy of default endpoint
CVE-2023-53484 7.8 HIGH lib: cpu_rmap: Avoid use after free on rmap->obj array entries
CVE-2022-50440 7.8 HIGH drm/vmwgfx: Validate the box size for the snooped cursor
CVE-2023-53465 7.8 HIGH soundwire: qcom: fix storing port config out-of-bounds
CVE-2025-39924 7.8 HIGH erofs: fix invalid algorithm for encoded extents
CVE-2023-53510 7.8 HIGH scsi: ufs: core: Fix handling of lrbp->cmd
CVE-2022-50454 7.8 HIGH drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()
CVE-2025-39927 7.8 HIGH ceph: fix race condition validating r_parent before applying state
CVE-2023-53506 7.8 HIGH udf: Do not bother merging very long extents
CVE-2022-50437 7.8 HIGH drm/msm/hdmi: fix memory corruption with too many bridges
CVE-2023-53494 7.8 HIGH crypto: xts - Handle EBUSY correctly
CVE-2023-53492 7.8 HIGH netfilter: nf_tables: do not ignore genmask when looking up chain by id
CVE-2022-50432 7.8 HIGH kernfs: fix use-after-free in __kernfs_remove
CVE-2023-53490 7.8 HIGH mptcp: fix disconnect vs accept race

Showing top 20 of 169 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53503

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