CVE-2026-46124
published 2026-05-28CVE-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()…
PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.43%
34.4th percentile
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
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.10.237 < 5.10.258 | 5.10.258 |
| linux | linux_kernel | >= 5.15.181 < 5.15.209 | 5.15.209 |
| linux | linux_kernel | >= 5.4.293 < 5.5 | 5.5 |
| linux | linux_kernel | >= 6.1.135 < 6.1.175 | 6.1.175 |
| linux | linux_kernel | >= 6.12.25 < 6.12.88 | 6.12.88 |
| linux | linux_kernel | >= 6.14.4 < 6.15 | 6.15 |
| linux | linux_kernel | >= 6.15.1 < 6.18.30 | 6.18.30 |
| linux | linux_kernel | >= 6.19 < 7.0.7 | 7.0.7 |
| linux | linux_kernel | >= 6.6.88 < 6.6.140 | 6.6.140 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_redhat7.1HIGH
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Red Hat
kernel: isofs: validate block number from NFS file handle in isofs_export_iget
vendor_redhat·2026-05-28·CVSS 7.1
CVE-2026-46124 [HIGH] CWE-1285 kernel: isofs: validate block number from NFS file handle in isofs_export_iget
kernel: isofs: validate block number from NFS file handle in isofs_export_iget
A flaw was found in the Linux kernel's `isofs` filesystem. An authenticated NFS (Network File System) peer can exploit this vulnerability by providing a specially crafted file handle. This allows the server to read arbitrary in-range blocks on the backing device, leading to information disclosure where unrelated data from adjacent partitions may be sent to the NFS client as directory entry metadata.
Package: kernel (Red Hat Enterprise Linux 10) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Not affected
Package
VulDB
Linux Kernel up to 7.1-rc1 isofs isofs_fh_to_dentry infinite loop
vuldb·2026-06-25·CVSS 7.5
CVE-2026-46124 [HIGH] Linux Kernel up to 7.1-rc1 isofs isofs_fh_to_dentry infinite loop
A vulnerability was found in Linux Kernel up to 6.6.139/6.12.87/6.18.29/7.0.6/7.1-rc1. It has been classified as critical. This issue affects the function isofs_fh_to_dentry of the component isofs. The manipulation leads to infinite loop.
This vulnerability is listed as CVE-2026-46124. The attack must be carried out from within the local network. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
GHSA-5599-pvjx-q3hc: In the Linux kernel, the following vulnerability has been resolved:
isofs: validate block number from NFS file handle in isofs_export_iget
isofs_fh_
ghsa_unreviewed·2026-05-28·CVSS 7.1
CVE-2026-46124 [HIGH] GHSA-5599-pvjx-q3hc: In the Linux kernel, the following vulnerability has been resolved:
isofs: validate block number from NFS file handle in isofs_export_iget
isofs_fh_
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
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0a1af74ae2177bda3aee0837a0546309aa539d0dhttps://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5https://git.kernel.org/stable/c/4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6https://git.kernel.org/stable/c/908a76f0b1038035e6ebb4f2293ce079f92e0a02https://git.kernel.org/stable/c/afbafeddf23db13fe2edb2d5c0bf4bbb13d7881bhttps://git.kernel.org/stable/c/bb0988ed4f2e26d59bbb58f644cb3a55b7521e21https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca
2026-05-28
Published