CVE-2026-53038 (GCVE-0-2026-53038)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
ima_fs: Correctly create securityfs files for unsupported hash algos
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 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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9fa8e76250082a45d0d3dad525419ab98bd01658 , < 081b557cb56e1cfa8d1619b2601b01c53e3f418c (git)
Affected: 9fa8e76250082a45d0d3dad525419ab98bd01658 , < b6766b171a5c4c33b26ff6fec530cb798db1f75e (git)
Affected: 9fa8e76250082a45d0d3dad525419ab98bd01658 , < 88d4e89a39f0de07798ca3fd93bd1a9ea212a82e (git)
Affected: 9fa8e76250082a45d0d3dad525419ab98bd01658 , < d7bd8cf0b348d3edae7bee33e74a32b21668b181 (git)
Create a notification for this product.
Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/integrity/ima/ima_fs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "081b557cb56e1cfa8d1619b2601b01c53e3f418c",
              "status": "affected",
              "version": "9fa8e76250082a45d0d3dad525419ab98bd01658",
              "versionType": "git"
            },
            {
              "lessThan": "b6766b171a5c4c33b26ff6fec530cb798db1f75e",
              "status": "affected",
              "version": "9fa8e76250082a45d0d3dad525419ab98bd01658",
              "versionType": "git"
            },
            {
              "lessThan": "88d4e89a39f0de07798ca3fd93bd1a9ea212a82e",
              "status": "affected",
              "version": "9fa8e76250082a45d0d3dad525419ab98bd01658",
              "versionType": "git"
            },
            {
              "lessThan": "d7bd8cf0b348d3edae7bee33e74a32b21668b181",
              "status": "affected",
              "version": "9fa8e76250082a45d0d3dad525419ab98bd01658",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "security/integrity/ima/ima_fs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nima_fs: Correctly create securityfs files for unsupported hash algos\n\nima_tpm_chip-\u003eallocated_banks[i].crypto_id is initialized to\nHASH_ALGO__LAST if the TPM algorithm is not supported. However there\nare places relying on the algorithm to be valid because it is accessed\nby hash_algo_name[].\n\nOn 6.12.40 I observe the following read out-of-bounds in hash_algo_name:\n  ==================================================================\n  BUG: KASAN: global-out-of-bounds in create_securityfs_measurement_lists+0x396/0x440\n  Read of size 8 at addr ffffffff83e18138 by task swapper/0/1\n\n  CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.40 #3\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x61/0x90\n   print_report+0xc4/0x580\n   ? kasan_addr_to_slab+0x26/0x80\n   ? create_securityfs_measurement_lists+0x396/0x440\n   kasan_report+0xc2/0x100\n   ? create_securityfs_measurement_lists+0x396/0x440\n   create_securityfs_measurement_lists+0x396/0x440\n   ima_fs_init+0xa3/0x300\n   ima_init+0x7d/0xd0\n   init_ima+0x28/0x100\n   do_one_initcall+0xa6/0x3e0\n   kernel_init_freeable+0x455/0x740\n   kernel_init+0x24/0x1d0\n   ret_from_fork+0x38/0x80\n   ret_from_fork_asm+0x11/0x20\n   \u003c/TASK\u003e\n\n  The buggy address belongs to the variable:\n   hash_algo_name+0xb8/0x420\n\n  Memory state around the buggy address:\n   ffffffff83e18000: 00 01 f9 f9 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9\n   ffffffff83e18080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  \u003effffffff83e18100: 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 00 05 f9 f9\n                                          ^\n   ffffffff83e18180: f9 f9 f9 f9 00 00 00 00 00 00 00 04 f9 f9 f9 f9\n   ffffffff83e18200: 00 00 00 00 00 00 00 00 04 f9 f9 f9 f9 f9 f9 f9\n  ==================================================================\n\nSeems like the TPM chip supports sha3_256, which isn\u0027t yet in\ntpm_algorithms:\n  tpm tpm0: TPM with unsupported bank algorithm 0x0027\n\nThat\u0027s TPM_ALG_SHA3_256 == 0x0027 from \"Trusted Platform Module 2.0\nLibrary Part 2: Structures\", page 51 [1].\nSee also the related U-Boot algorithms update [2].\n\nThus solve the problem by creating a file name with \"_tpm_alg_\u003cID\u003e\"\npostfix if the crypto algorithm isn\u0027t initialized.\n\nThis is how it looks on the test machine (patch ported to v6.12 release):\n  # ls -1 /sys/kernel/security/ima/\n  ascii_runtime_measurements\n  ascii_runtime_measurements_tpm_alg_27\n  ascii_runtime_measurements_sha1\n  ascii_runtime_measurements_sha256\n  binary_runtime_measurements\n  binary_runtime_measurements_tpm_alg_27\n  binary_runtime_measurements_sha1\n  binary_runtime_measurements_sha256\n  policy\n  runtime_measurements_count\n  violations\n\n[1]: https://trustedcomputinggroup.org/wp-content/uploads/Trusted-Platform-Module-2.0-Library-Part-2-Version-184_pub.pdf\n[2]: https://lists.denx.de/pipermail/u-boot/2024-July/558835.html"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:45.086Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/081b557cb56e1cfa8d1619b2601b01c53e3f418c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b6766b171a5c4c33b26ff6fec530cb798db1f75e"
        },
        {
          "url": "https://git.kernel.org/stable/c/88d4e89a39f0de07798ca3fd93bd1a9ea212a82e"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7bd8cf0b348d3edae7bee33e74a32b21668b181"
        }
      ],
      "title": "ima_fs: Correctly create securityfs files for unsupported hash algos",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53038",
    "datePublished": "2026-06-24T16:29:45.086Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-06-24T16:29:45.086Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53038",
      "date": "2026-07-02",
      "epss": "0.00168",
      "percentile": "0.06375"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53038\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:15.403\",\"lastModified\":\"2026-06-24T17:17:15.403\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nima_fs: Correctly create securityfs files for unsupported hash algos\\n\\nima_tpm_chip-\u003eallocated_banks[i].crypto_id is initialized to\\nHASH_ALGO__LAST if the TPM algorithm is not supported. However there\\nare places relying on the algorithm to be valid because it is accessed\\nby hash_algo_name[].\\n\\nOn 6.12.40 I observe the following read out-of-bounds in hash_algo_name:\\n  ==================================================================\\n  BUG: KASAN: global-out-of-bounds in create_securityfs_measurement_lists+0x396/0x440\\n  Read of size 8 at addr ffffffff83e18138 by task swapper/0/1\\n\\n  CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.40 #3\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl+0x61/0x90\\n   print_report+0xc4/0x580\\n   ? kasan_addr_to_slab+0x26/0x80\\n   ? create_securityfs_measurement_lists+0x396/0x440\\n   kasan_report+0xc2/0x100\\n   ? create_securityfs_measurement_lists+0x396/0x440\\n   create_securityfs_measurement_lists+0x396/0x440\\n   ima_fs_init+0xa3/0x300\\n   ima_init+0x7d/0xd0\\n   init_ima+0x28/0x100\\n   do_one_initcall+0xa6/0x3e0\\n   kernel_init_freeable+0x455/0x740\\n   kernel_init+0x24/0x1d0\\n   ret_from_fork+0x38/0x80\\n   ret_from_fork_asm+0x11/0x20\\n   \u003c/TASK\u003e\\n\\n  The buggy address belongs to the variable:\\n   hash_algo_name+0xb8/0x420\\n\\n  Memory state around the buggy address:\\n   ffffffff83e18000: 00 01 f9 f9 f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9\\n   ffffffff83e18080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n  \u003effffffff83e18100: 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 00 05 f9 f9\\n                                          ^\\n   ffffffff83e18180: f9 f9 f9 f9 00 00 00 00 00 00 00 04 f9 f9 f9 f9\\n   ffffffff83e18200: 00 00 00 00 00 00 00 00 04 f9 f9 f9 f9 f9 f9 f9\\n  ==================================================================\\n\\nSeems like the TPM chip supports sha3_256, which isn\u0027t yet in\\ntpm_algorithms:\\n  tpm tpm0: TPM with unsupported bank algorithm 0x0027\\n\\nThat\u0027s TPM_ALG_SHA3_256 == 0x0027 from \\\"Trusted Platform Module 2.0\\nLibrary Part 2: Structures\\\", page 51 [1].\\nSee also the related U-Boot algorithms update [2].\\n\\nThus solve the problem by creating a file name with \\\"_tpm_alg_\u003cID\u003e\\\"\\npostfix if the crypto algorithm isn\u0027t initialized.\\n\\nThis is how it looks on the test machine (patch ported to v6.12 release):\\n  # ls -1 /sys/kernel/security/ima/\\n  ascii_runtime_measurements\\n  ascii_runtime_measurements_tpm_alg_27\\n  ascii_runtime_measurements_sha1\\n  ascii_runtime_measurements_sha256\\n  binary_runtime_measurements\\n  binary_runtime_measurements_tpm_alg_27\\n  binary_runtime_measurements_sha1\\n  binary_runtime_measurements_sha256\\n  policy\\n  runtime_measurements_count\\n  violations\\n\\n[1]: https://trustedcomputinggroup.org/wp-content/uploads/Trusted-Platform-Module-2.0-Library-Part-2-Version-184_pub.pdf\\n[2]: https://lists.denx.de/pipermail/u-boot/2024-July/558835.html\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"security/integrity/ima/ima_fs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9fa8e76250082a45d0d3dad525419ab98bd01658\",\"lessThan\":\"081b557cb56e1cfa8d1619b2601b01c53e3f418c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fa8e76250082a45d0d3dad525419ab98bd01658\",\"lessThan\":\"b6766b171a5c4c33b26ff6fec530cb798db1f75e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fa8e76250082a45d0d3dad525419ab98bd01658\",\"lessThan\":\"88d4e89a39f0de07798ca3fd93bd1a9ea212a82e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9fa8e76250082a45d0d3dad525419ab98bd01658\",\"lessThan\":\"d7bd8cf0b348d3edae7bee33e74a32b21668b181\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"security/integrity/ima/ima_fs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/081b557cb56e1cfa8d1619b2601b01c53e3f418c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88d4e89a39f0de07798ca3fd93bd1a9ea212a82e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6766b171a5c4c33b26ff6fec530cb798db1f75e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d7bd8cf0b348d3edae7bee33e74a32b21668b181\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.