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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-46124

isofs: validate block number from NFS file handle in isofs_export_iget

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 backing device as if it were an iso_directory_record. That earlier fix was assigned CVE-2025-37780. sb_bread() on an out-of-range block returns NULL cleanly via the EIO path, so there is no memory-safety violation. For in-range reads of adjacent-partition data on the same block device, the unrelated bytes end up in iso_inode_info fields that reach the NFS client as dentry metadata. The deployment surface (isofs exported over NFS from loop-mounted images) is narrow and requires an authenticated NFS peer, but the malformed-file-handle class is reportable as hardening next to the existing CVE-2025-37780 fix. Reject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so the check covers both isofs_fh_to_dentry() and isofs_fh_to_parent() call sites with a single line.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 5e7de55602c61c8ff28db075cc49c8dd6989d7e0 to < ee0024f5a7e3c73aa253869fae9650ae054093caaffected
  • 63d5a3e207bf315a32c7d16de6c89753a759f95a to < 31dbb4ba0f719ae7774e4c0c95172c9bf81692f5affected
  • 0fdafdaef796816a9ed0fd7ac812932d569d9beb to < 908a76f0b1038035e6ebb4f2293ce079f92e0a02affected
  • 952e7a7e317f126d0a2b879fc531b716932d5ffa to < bb0988ed4f2e26d59bbb58f644cb3a55b7521e21affected
  • 56dfffea9fd3be0b3795a9ca6401e133a8427e0b to < 0a1af74ae2177bda3aee0837a0546309aa539d0daffected
  • 0405d4b63d082861f4eaff9d39c78ee9dc34f845 to < afbafeddf23db13fe2edb2d5c0bf4bbb13d7881baffected
  • 0405d4b63d082861f4eaff9d39c78ee9dc34f845 to < 4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6affected
  • 0405d4b63d082861f4eaff9d39c78ee9dc34f845 to < 24376458138387fb251e782e624c7776e9826796affected
  • ee01a309ebf598be1ff8174901ed6e91619f1749affected
  • 007124c896e7d4614ac1f6bd4dedb975c35a2a8eaffected
  • 5.10.237 to < 5.10.258affected
  • 5.15.181 to < 5.15.209affected
  • 6.1.135 to < 6.1.175affected
  • 6.6.88 to < 6.6.140affected
  • 6.12.25 to < 6.12.88affected
  • 5.4.293 to < 5.5affected
  • 6.14.4 to < 6.15affected

Linux Linux

Default version status: affected

  • 6.15affected
  • 0 to < 6.15unaffected
  • 5.10.258 to ≤ 5.10.*unaffected
  • 5.15.209 to ≤ 5.15.*unaffected
  • 6.1.175 to ≤ 6.1.*unaffected
  • 6.6.140 to ≤ 6.6.*unaffected
  • 6.12.88 to ≤ 6.12.*unaffected
  • 6.18.30 to ≤ 6.18.*unaffected
  • 7.0.7 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References