CVE-2023-53503 — NULL Pointer Dereference in Linux

CWE-476 — NULL Pointer DereferenceCWE-787 — Out-of-bounds Write5 documents5 sources
Severity
5.5MEDIUMNVD
EPSS
0.0%
top 93.02%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
LinuxLinux KernelDebian Linux
Timeline
PublishedOct 1

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 numbe…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages4 packages

▶NVDlinux/linux_kernel3.11 — 5.10.181+4
▶Debianlinux/linux_kernel< 5.10.191-1+3
▶CVEListV5linux/linux2f2e09eb15849562aede80ed007658e4504ded26 — 100c0ad6c04597fefeaaba2bb1827cc015d95067+5
▶debiandebian/linux< linux 6.1.37-1 (bookworm)

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-794g-3p8m-5jpc: In the Linux kernel, the following vulnerability has been resolved: ext4: allow ext4_get_group_info() to fail Previously, ext4_get_group_info() woul↗2025-10-01
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OSV
CVE-2023-53503: In the Linux kernel, the following vulnerability has been resolved: ext4: allow ext4_get_group_info() to fail Previously, ext4_get_group_info() would↗2025-10-01
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📋Vendor Advisories

2
Red Hat
kernel: ext4: allow ext4_get_group_info() to fail↗2025-10-01
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Debian
CVE-2023-53503: linux - In the Linux kernel, the following vulnerability has been resolved: ext4: allow...↗2023
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