CVE-2026-46124

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.

• linux linux kernel (>= 5.4.293 < 5.5) • linux linux kernel (>= 5.10.237 < 5.10.258) • linux linux kernel (>= 5.15.181 < 5.15.209) • linux linux kernel (>= 6.1.135 < 6.1.175) • linux linux kernel (>= 6.6.88 < 6.6.140) • linux linux kernel (>= 6.12.25 < 6.12.88) • linux linux kernel (>= 6.14.4 < 6.15) • linux linux kernel (>= 6.15.1 < 6.18.30) • linux linux kernel (>= 6.19 < 7.0.7) • linux linux kernel 6.15 • linux linux kernel 7.1