CVE-2026-63817

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-63817
In the Linux kernel, the following vulnerability has been resolved: f2fs: validate compress cache inode only when enabled F2FS_COMPRESS_INO() uses NM_I(sbi)->max_nid as the synthetic inode number for the compressed page cache inode. That inode only exists when the compress_cache mount option is enabled. When compress_cache is disabled, max_nid is outside the valid inode range. A corrupted directory entry that points to ino == max_nid should therefore be rejected by f2fs_check_nid_range(). However, is_meta_ino() currently treats F2FS_COMPRESS_INO() as a meta inode unconditionally, so f2fs_iget() bypasses do_read_inode() and its nid range check, and instantiates a fake internal inode instead. Gate the compressed cache inode case on COMPRESS_CACHE, matching f2fs_init_compress_inode(). With compress_cache disabled, ino == max_nid now follows the normal inode path and is rejected as an out-of-range nid.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0969926d987bbde9a1aa49da317582ba37095805 Patch
https://git.kernel.org/stable/c/13e4b59d3a9413f66f116fa6c4828519b960a5ea Patch
https://git.kernel.org/stable/c/16161444c30d8dff9428abbae42b72ce4e32a932 Patch
https://git.kernel.org/stable/c/29115b8c9172d34e67ab26cc4f6c209b7a236d7a Patch
https://git.kernel.org/stable/c/5073c66a96a9c23c0c2533ed4ed06e42f9021208 Patch
https://git.kernel.org/stable/c/77f216ff9ce5cde8eed9f6d12707e906dffdc9f7 Patch
https://git.kernel.org/stable/c/fcc051d377a9701a452e7663a1a8223c26225df9 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

10 Nov 2026, 21:14

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0969926d987bbde9a1aa49da317582ba37095805 - () https://git.kernel.org/stable/c/0969926d987bbde9a1aa49da317582ba37095805 - Patch
References () https://git.kernel.org/stable/c/13e4b59d3a9413f66f116fa6c4828519b960a5ea - () https://git.kernel.org/stable/c/13e4b59d3a9413f66f116fa6c4828519b960a5ea - Patch
References () https://git.kernel.org/stable/c/16161444c30d8dff9428abbae42b72ce4e32a932 - () https://git.kernel.org/stable/c/16161444c30d8dff9428abbae42b72ce4e32a932 - Patch
References () https://git.kernel.org/stable/c/29115b8c9172d34e67ab26cc4f6c209b7a236d7a - () https://git.kernel.org/stable/c/29115b8c9172d34e67ab26cc4f6c209b7a236d7a - Patch
References () https://git.kernel.org/stable/c/5073c66a96a9c23c0c2533ed4ed06e42f9021208 - () https://git.kernel.org/stable/c/5073c66a96a9c23c0c2533ed4ed06e42f9021208 - Patch
References () https://git.kernel.org/stable/c/77f216ff9ce5cde8eed9f6d12707e906dffdc9f7 - () https://git.kernel.org/stable/c/77f216ff9ce5cde8eed9f6d12707e906dffdc9f7 - Patch
References () https://git.kernel.org/stable/c/fcc051d377a9701a452e7663a1a8223c26225df9 - () https://git.kernel.org/stable/c/fcc051d377a9701a452e7663a1a8223c26225df9 - Patch
CWE NVD-CWE-noinfo
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Information

Published : 2026-07-19 12:16

Updated : 2026-11-10 21:14

NVD link : CVE-2026-63817

Mitre link : CVE-2026-63817

CVE.ORG link : CVE-2026-63817

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo