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Review reviewHigh

CVE-2026-46124

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: isofs: validate block number from NFS file handle in isofs_export_iget isofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker- controlled block number (ifid->block or ifid->parent_block) from the NFS file handle to isofs_export_iget(), which only rejects block == 0 before calling isofs_iget() and ultimately sb_bread(). A crafted file handle with fh_len sufficient to pass the check added by commit 0405d4b63d08 ("isofs: Prevent the use of too small fid") can still drive the server to read any in-range block on the bac...

CVSS
7.5
EPSS
0.43%
35.0% percentile
CISA KEV
Not listed
Published
2026.05.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.43%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: isofs: validate block number from NFS file handle in isofs_export_iget isofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker- controlled block number (ifid->block or ifid->parent_block) from the NFS file handle to isofs_export_iget(), which only rejects block == 0 before calling isofs_iget() and ultimately sb_bread(). A crafted file handle with fh_len sufficient to pass the check added by commit 0405d4b63d08 ("isofs: Prevent the use of too small fid") can still drive the server to read any in-range block on the bac...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
5e7de55602c61c8ff28db075cc49c8dd6989d7e0, 63d5a3e207bf315a32c7d16de6c89753a759f95a, 0fdafdaef796816a9ed0fd7ac812932d569d9beb, 952e7a7e317f126d0a2b879fc531b716932d5ffa, 56dfffea9fd3be0b3795a9ca6401e133a8427e0b, 0405d4b63d082861f4eaff9d39c78ee9dc34f845, ee01a309ebf598be1ff8174901ed6e91619f1749, 007124c896e7d4614ac1f6bd4dedb975c35a2a8e, 5.10.237, 5.15.181, 6.1.135, 6.6.88, 6.12.25, 5.4.293, 6.14.4, 6.15, >= 5.4.293 < 5.5, >= 5.10.237 < 5.10.258, >= 5.15.181 < 5.15.209, >= 6.1.135 < 6.1.175
Fixed versions
5.5, 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, 6.15, 6.18.30, 7.0.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
Not available