CVE-2026-31666

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-31666
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix incorrect return value after changing leaf in lookup_extent_data_ref() After commit 1618aa3c2e01 ("btrfs: simplify return variables in lookup_extent_data_ref()"), the err and ret variables were merged into a single ret variable. However, when btrfs_next_leaf() returns 0 (success), ret is overwritten from -ENOENT to 0. If the first key in the next leaf does not match (different objectid or type), the function returns 0 instead of -ENOENT, making the caller believe the lookup succeeded when it did not. This can lead to operations on the wrong extent tree item, potentially causing extent tree corruption. Fix this by returning -ENOENT directly when the key does not match, instead of relying on the ret variable.

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/316fb1b3169efb081d2db910cbbfef445afa03b9 Patch
https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce Patch
https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b Patch
https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5 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:6.10:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
History

27 Apr 2026, 20:00

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.10:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
First Time Linux
Linux linux Kernel
CWE NVD-CWE-noinfo
References () https://git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9 - () https://git.kernel.org/stable/c/316fb1b3169efb081d2db910cbbfef445afa03b9 - Patch
References () https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce - () https://git.kernel.org/stable/c/4125a194db4a6cf91f619f38788272651cb97dce - Patch
References () https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b - () https://git.kernel.org/stable/c/450e6a685d0cad95b15f8af152057bd0bf79f50b - Patch
References () https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5 - () https://git.kernel.org/stable/c/ab1e022379c3c811aa72da8eb0c7507859a1d0f5 - Patch

27 Apr 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

24 Apr 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-24 15:16

Updated : 2026-04-27 20:00

NVD link : CVE-2026-31666

Mitre link : CVE-2026-31666

CVE.ORG link : CVE-2026-31666

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo