---
id: CVE-2026-53038
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ima_fs: Correctly create securityfs files for unsupported hash algos

  ima_tpm_chip->allocated_banks[i].crypto_id is initialized to
  HASH_ALGO__LAST if the TPM algorithm …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ima_fs: Correctly create securityfs files for unsupported hash algos

  ima_tpm_chip->allocated_banks[i].crypto_id is initialized to
  HASH_ALGO__LAST if the TPM algorithm …
severity: none
published: '2026-06-24'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53038'
references:
  - url: 'https://git.kernel.org/stable/c/081b557cb56e1cfa8d1619b2601b01c53e3f418c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/88d4e89a39f0de07798ca3fd93bd1a9ea212a82e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b6766b171a5c4c33b26ff6fec530cb798db1f75e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d7bd8cf0b348d3edae7bee33e74a32b21668b181'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00162
epssPercentile: 0.04642
ingestedAt: '2026-07-11T19:15:12.280Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ima_fs: Correctly create securityfs files for unsupported hash algos

ima_tpm_chip->allocated_banks[i].crypto_id is initialized to
HASH_ALGO__LAST if the TPM algorithm is not supported. However there
are places relying on the algorithm to be valid because it is accessed
by hash_algo_name[].

On 6.12.40 I observe the following read out-of-bounds in hash_algo_name:
  ==================================================================
  BUG: KASAN: global-out-of-bounds in create_securityfs_measurement_lists+0x396/0x440
  Read of size 8 at addr ffffffff83e18138 by task swapper/0/1

  CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.40 #3
  Call Trace:
   <TASK>
   dump_stack_lvl+0x61/0x90
   print_report+0xc4/0x580
   ? kasan_addr_to_slab+0x26/0x80
   ? create_securityfs_measurement_lists+0x396/0x440
   kasan_report+0xc2/0x100
   ? create_securityfs_measurement_lists+0x396/0x440
   create_securityfs_measurement_lists+0x396/0x440
   ima_fs_init+0xa3/0x300
   ima_init+0x7d/0xd0
   init_ima+0x28/0x100
   do_one_initcall+0xa6/0x3e0
   kernel_init_freeable+0x455/0x740
   kernel_init+0x24/0x1d0
   ret_from_fork+0x38/0x80
   ret_from_fork_asm+0x11/0x20
   </TASK>

  The buggy address belongs to the variable:
   hash_algo_name+0xb8/0x420

  Memory state around the buggy address:
   ffffffff83e18000: 00 01 f9 f9 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9
   ffffffff83e18080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  >ffffffff83e18100: 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 00 05 f9 f9
                                          ^
   ffffffff83e18180: f9 f9 f9 f9 00 00 00 00 00 00 00 04 f9 f9 f9 f9
   ffffffff83e18200: 00 00 00 00 00 00 00 00 04 f9 f9 f9 f9 f9 f9 f9
  ==================================================================

Seems like the TPM chip supports sha3_256, which isn't yet in
tpm_algorithms:
  tpm tpm0: TPM with unsupported bank algorithm 0x0027

That's TPM_ALG_SHA3_256 == 0x0027 from "Trusted Platform Module 2.0
Library Part 2: Structures", page 51 [1].
See also the related U-Boot algorithms update [2].

Thus solve the problem by creating a file name with "_tpm_alg_<ID>"
postfix if the crypto algorithm isn't initialized.

This is how it looks on the test machine (patch ported to v6.12 release):
  # ls -1 /sys/kernel/security/ima/
  ascii_runtime_measurements
  ascii_runtime_measurements_tpm_alg_27
  ascii_runtime_measurements_sha1
  ascii_runtime_measurements_sha256
  binary_runtime_measurements
  binary_runtime_measurements_tpm_alg_27
  binary_runtime_measurements_sha1
  binary_runtime_measurements_sha256
  policy
  runtime_measurements_count
  violations

[1]: https://trustedcomputinggroup.org/wp-content/uploads/Trusted-Platform-Module-2.0-Library-Part-2-Version-184_pub.pdf
[2]: https://lists.denx.de/pipermail/u-boot/2024-July/558835.html

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.