CVE-2025-40008 (GCVE-0-2025-40008)

Vulnerability from cvelistv5 – Published: 2025-10-20 15:26 – Updated: 2026-05-23 16:01
VLAI
Title
kmsan: fix out-of-bounds access to shadow memory
Summary
In the Linux kernel, the following vulnerability has been resolved: kmsan: fix out-of-bounds access to shadow memory Running sha224_kunit on a KMSAN-enabled kernel results in a crash in kmsan_internal_set_shadow_origin(): BUG: unable to handle page fault for address: ffffbc3840291000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0 Oops: 0000 [#1] SMP NOPTI CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G N 6.17.0-rc3 #10 PREEMPT(voluntary) Tainted: [N]=TEST Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014 RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100 [...] Call Trace: <TASK> __msan_memset+0xee/0x1a0 sha224_final+0x9e/0x350 test_hash_buffer_overruns+0x46f/0x5f0 ? kmsan_get_shadow_origin_ptr+0x46/0xa0 ? __pfx_test_hash_buffer_overruns+0x10/0x10 kunit_try_run_case+0x198/0xa00 This occurs when memset() is called on a buffer that is not 4-byte aligned and extends to the end of a guard page, i.e. the next page is unmapped. The bug is that the loop at the end of kmsan_internal_set_shadow_origin() accesses the wrong shadow memory bytes when the address is not 4-byte aligned. Since each 4 bytes are associated with an origin, it rounds the address and size so that it can access all the origins that contain the buffer. However, when it checks the corresponding shadow bytes for a particular origin, it incorrectly uses the original unrounded shadow address. This results in reads from shadow memory beyond the end of the buffer's shadow memory, which crashes when that memory is not mapped. To fix this, correctly align the shadow address before accessing the 4 shadow bytes corresponding to each origin.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9ff078f5bad8990091f1639347de5e02636e9536 , < e6684ed39edc35401a3341f85b1ab50a6f89a45d (git)
Affected: 19e85d939001946671643f4c16e1de8c633a6ce0 , < df1fa034c0fc229a63d01ffb20bb919b839cb576 (git)
Affected: 2ef3cec44c60ae171b287db7fc2aa341586d65ba , < f84e48707051812289b6c2684d4df2daa9d3bfbc (git)
Affected: 2ef3cec44c60ae171b287db7fc2aa341586d65ba , < 5855792c6bb9a825607845db3feaddaff0414ec3 (git)
Affected: 2ef3cec44c60ae171b287db7fc2aa341586d65ba , < 85e1ff61060a765d91ee62dc5606d4d547d9d105 (git)
Affected: abeede7011da6c88e83ed260b909c140b8c9c250 (git)
Affected: 6.1.94 , < 6.1.155 (semver)
Affected: 6.6.34 , < 6.6.109 (semver)
Affected: 6.9.5 , < 6.10 (semver)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.1.155 , ≤ 6.1.* (semver)
Unaffected: 6.6.109 , ≤ 6.6.* (semver)
Unaffected: 6.12.50 , ≤ 6.12.* (semver)
Unaffected: 6.16.10 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkmsan: fix out-of-bounds access to shadow memory\n\nRunning sha224_kunit on a KMSAN-enabled kernel results in a crash in\nkmsan_internal_set_shadow_origin():\n\n    BUG: unable to handle page fault for address: ffffbc3840291000\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0\n    Oops: 0000 [#1] SMP NOPTI\n    CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G                 N  6.17.0-rc3 #10 PREEMPT(voluntary)\n    Tainted: [N]=TEST\n    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n    RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100\n    [...]\n    Call Trace:\n    \u003cTASK\u003e\n    __msan_memset+0xee/0x1a0\n    sha224_final+0x9e/0x350\n    test_hash_buffer_overruns+0x46f/0x5f0\n    ? kmsan_get_shadow_origin_ptr+0x46/0xa0\n    ? __pfx_test_hash_buffer_overruns+0x10/0x10\n    kunit_try_run_case+0x198/0xa00\n\nThis occurs when memset() is called on a buffer that is not 4-byte aligned\nand extends to the end of a guard page, i.e.  the next page is unmapped.\n\nThe bug is that the loop at the end of kmsan_internal_set_shadow_origin()\naccesses the wrong shadow memory bytes when the address is not 4-byte\naligned.  Since each 4 bytes are associated with an origin, it rounds the\naddress and size so that it can access all the origins that contain the\nbuffer.  However, when it checks the corresponding shadow bytes for a\nparticular origin, it incorrectly uses the original unrounded shadow\naddress.  This results in reads from shadow memory beyond the end of the\nbuffer\u0027s shadow memory, which crashes when that memory is not mapped.\n\nTo fix this, correctly align the shadow address before accessing the 4\nshadow bytes corresponding to each origin."
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkmsan: fix out-of-bounds access to shadow memory\n\nRunning sha224_kunit on a KMSAN-enabled kernel results in a crash in\nkmsan_internal_set_shadow_origin():\n\n    BUG: unable to handle page fault for address: ffffbc3840291000\n    #PF: supervisor read access in kernel mode\n    #PF: error_code(0x0000) - not-present page\n    PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0\n    Oops: 0000 [#1] SMP NOPTI\n    CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G                 N  6.17.0-rc3 #10 PREEMPT(voluntary)\n    Tainted: [N]=TEST\n    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n    RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100\n    [...]\n    Call Trace:\n    \u003cTASK\u003e\n    __msan_memset+0xee/0x1a0\n    sha224_final+0x9e/0x350\n    test_hash_buffer_overruns+0x46f/0x5f0\n    ? kmsan_get_shadow_origin_ptr+0x46/0xa0\n    ? __pfx_test_hash_buffer_overruns+0x10/0x10\n    kunit_try_run_case+0x198/0xa00\n\nThis occurs when memset() is called on a buffer that is not 4-byte aligned\nand extends to the end of a guard page, i.e.  the next page is unmapped.\n\nThe bug is that the loop at the end of kmsan_internal_set_shadow_origin()\naccesses the wrong shadow memory bytes when the address is not 4-byte\naligned.  Since each 4 bytes are associated with an origin, it rounds the\naddress and size so that it can access all the origins that contain the\nbuffer.  However, when it checks the corresponding shadow bytes for a\nparticular origin, it incorrectly uses the original unrounded shadow\naddress.  This results in reads from shadow memory beyond the end of the\nbuffer\u0027s shadow memory, which crashes when that memory is not mapped.\n\nTo fix this, correctly align the shadow address before accessing the 4\nshadow bytes corresponding to each origin."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nkmsan: correcci\u00f3n de acceso fuera de l\u00edmites a la memoria de sombra\n\nEjecutar sha224_kunit en un kernel con KMSAN habilitado resulta en un fallo en\nkmsan_internal_set_shadow_origin():\n\n    BUG: no se puede manejar el fallo de p\u00e1gina para la direcci\u00f3n: ffffbc3840291000\n    #PF: acceso de lectura de supervisor en modo kernel\n    #PF: error_code(0x0000) - p\u00e1gina no presente\n    PGD 1810067 P4D 1810067 PUD 192d067 PMD 3c17067 PTE 0\n    Oops: 0000 [#1] SMP NOPTI\n    CPU: 0 UID: 0 PID: 81 Comm: kunit_try_catch Tainted: G                 N  6.17.0-rc3 #10 PREEMPT(voluntary)\n    Tainted: [N]=TEST\n    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n    RIP: 0010:kmsan_internal_set_shadow_origin+0x91/0x100\n    [...]\n    Traza de llamadas:\n    \u003cTASK\u003e\n    __msan_memset+0xee/0x1a0\n    sha224_final+0x9e/0x350\n    test_hash_buffer_overruns+0x46f/0x5f0\n    ? kmsan_get_shadow_origin_ptr+0x46/0xa0\n    ? __pfx_test_hash_buffer_overruns+0x10/0x10\n    kunit_try_run_case+0x198/0xa00\n\nEsto ocurre cuando se llama a memset() en un b\u00fafer que no est\u00e1 alineado a 4 bytes y se extiende hasta el final de una p\u00e1gina de guardia, es decir, la siguiente p\u00e1gina no est\u00e1 mapeada.\n\nEl error es que el bucle al final de kmsan_internal_set_shadow_origin() accede a los bytes incorrectos de la memoria de sombra cuando la direcci\u00f3n no est\u00e1 alineada a 4 bytes. Dado que cada 4 bytes est\u00e1n asociados con un origen, redondea la direcci\u00f3n y el tama\u00f1o para que pueda acceder a todos los or\u00edgenes que contienen el b\u00fafer. Sin embargo, cuando comprueba los bytes de sombra correspondientes para un origen particular, utiliza incorrectamente la direcci\u00f3n de sombra original sin redondear. Esto resulta en lecturas de la memoria de sombra m\u00e1s all\u00e1 del final de la memoria de sombra del b\u00fafer, lo que provoca un fallo cuando esa memoria no est\u00e1 mapeada.\n\nPara solucionar esto, alinee correctamente la direcci\u00f3n de sombra antes de acceder a los 4 bytes de sombra correspondientes a cada origen."
          }
        ],
        "id": "CVE-2025-40008",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-10-20T16:15:37.480",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5855792c6bb9a825607845db3feaddaff0414ec3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/85e1ff61060a765d91ee62dc5606d4d547d9d105"
          },
          {
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            "url": "https://git.kernel.org/stable/c/df1fa034c0fc229a63d01ffb20bb919b839cb576"
          },
          {
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            "url": "https://git.kernel.org/stable/c/e6684ed39edc35401a3341f85b1ab50a6f89a45d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f84e48707051812289b6c2684d4df2daa9d3bfbc"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:34:06+00:00",
      "cve": "CVE-2025-40008",
      "id": "CVE-2025-40008",
      "initial_release_date": "2025-10-20T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kmsan: fix out-of-bounds access to shadow memory",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40008.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.