CVE-2026-53046 (GCVE-0-2026-53046)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-28 06:38
VLAI
Title
ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine ksmbd_crypt_message() sets a NULL completion callback on AEAD requests and does not handle the -EINPROGRESS return code from async hardware crypto engines like the Qualcomm Crypto Engine (QCE). When QCE returns -EINPROGRESS, ksmbd treats it as an error and immediately frees the request while the hardware DMA operation is still in flight. The DMA completion callback then dereferences freed memory, causing a NULL pointer crash: pc : qce_skcipher_done+0x24/0x174 lr : vchan_complete+0x230/0x27c ... el1h_64_irq+0x68/0x6c ksmbd_free_work_struct+0x20/0x118 [ksmbd] ksmbd_exit_file_cache+0x694/0xa4c [ksmbd] Use the standard crypto_wait_req() pattern with crypto_req_done() as the completion callback, matching the approach used by the SMB client in fs/smb/client/smb2ops.c. This properly handles both synchronous engines (immediate return) and async engines (-EINPROGRESS followed by callback notification).
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 57b47231055b431ed0a1a55f33cac32981564405 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < cc2da381875d4a67026e4c8feb3dba51a2a2d1bc (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 8fcefe840fa8c14ce667768e5b043286ac3bbcbe (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 8ef183216feaa24b66b940510d8b68f680eb56e9 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 7164b3953cefd540e7ebca828c793bc6869cfbc4 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < b46aa129fa2807bfe1545fe74d9295d53c51520b (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 3e298897f41c61450c2e7a4f457e8b2485eb35b3 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (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)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free from async crypto on Qualcomm crypto engine\n\nksmbd_crypt_message() sets a NULL completion callback on AEAD requests\nand does not handle the -EINPROGRESS return code from async hardware\ncrypto engines like the Qualcomm Crypto Engine (QCE). When QCE returns\n-EINPROGRESS, ksmbd treats it as an error and immediately frees the\nrequest while the hardware DMA operation is still in flight. The DMA\ncompletion callback then dereferences freed memory, causing a NULL\npointer crash:\n\n  pc : qce_skcipher_done+0x24/0x174\n  lr : vchan_complete+0x230/0x27c\n  ...\n  el1h_64_irq+0x68/0x6c\n  ksmbd_free_work_struct+0x20/0x118 [ksmbd]\n  ksmbd_exit_file_cache+0x694/0xa4c [ksmbd]\n\nUse the standard crypto_wait_req() pattern with crypto_req_done() as\nthe completion callback, matching the approach used by the SMB client\nin fs/smb/client/smb2ops.c. This properly handles both synchronous\nengines (immediate return) and async engines (-EINPROGRESS followed\nby callback notification)."
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    "cveId": "CVE-2026-53046",
    "datePublished": "2026-06-24T16:29:52.676Z",
    "dateReserved": "2026-06-09T07:44:35.381Z",
    "dateUpdated": "2026-06-28T06:38:28.822Z",
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The DMA\\ncompletion callback then dereferences freed memory, causing a NULL\\npointer crash:\\n\\n  pc : qce_skcipher_done+0x24/0x174\\n  lr : vchan_complete+0x230/0x27c\\n  ...\\n  el1h_64_irq+0x68/0x6c\\n  ksmbd_free_work_struct+0x20/0x118 [ksmbd]\\n  ksmbd_exit_file_cache+0x694/0xa4c [ksmbd]\\n\\nUse the standard crypto_wait_req() pattern with crypto_req_done() as\\nthe completion callback, matching the approach used by the SMB client\\nin fs/smb/client/smb2ops.c. 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  }
}


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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

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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.