CVE-2025-38488 (GCVE-0-2025-38488)

Vulnerability from cvelistv5 – Published: 2025-07-28 11:21 – Updated: 2026-05-11 21:28
VLAI?
Title
smb: client: fix use-after-free in crypt_message when using async crypto
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free in crypt_message when using async crypto The CVE-2024-50047 fix removed asynchronous crypto handling from crypt_message(), assuming all crypto operations are synchronous. However, when hardware crypto accelerators are used, this can cause use-after-free crashes: crypt_message() // Allocate the creq buffer containing the req creq = smb2_get_aead_req(..., &req); // Async encryption returns -EINPROGRESS immediately rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); // Free creq while async operation is still in progress kvfree_sensitive(creq, ...); Hardware crypto modules often implement async AEAD operations for performance. When crypto_aead_encrypt/decrypt() returns -EINPROGRESS, the operation completes asynchronously. Without crypto_wait_req(), the function immediately frees the request buffer, leading to crashes when the driver later accesses the freed memory. This results in a use-after-free condition when the hardware crypto driver later accesses the freed request structure, leading to kernel crashes with NULL pointer dereferences. The issue occurs because crypto_alloc_aead() with mask=0 doesn't guarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in the mask, async implementations can be selected. Fix by restoring the async crypto handling: - DECLARE_CRYPTO_WAIT(wait) for completion tracking - aead_request_set_callback() for async completion notification - crypto_wait_req() to wait for operation completion This ensures the request buffer isn't freed until the crypto operation completes, whether synchronous or asynchronous, while preserving the CVE-2024-50047 fix.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8f14a476abba13144df5434871a7225fd29af633 , < 5d047b12f86cc3b9fde1171c02d9bccf4dba0632 (git)
Affected: ef51c0d544b1518b35364480317ab6d3468f205d , < 6550b2bef095d0dd2d2c8390d2ea4c3837028833 (git)
Affected: bce966530fd5542bbb422cb45ecb775f7a1a6bc3 , < 9a1d3e8d40f151c2d5a5f40c410e6e433f62f438 (git)
Affected: 0809fb86ad13b29e1d6d491364fc7ea4fb545995 , < 15a0a5de49507062bc3be4014a403d8cea5533de (git)
Affected: b0abcd65ec545701b8793e12bc27dc98042b151a , < 2a76bc2b24ed889a689fb1c9015307bf16aafb5b (git)
Affected: b0abcd65ec545701b8793e12bc27dc98042b151a , < 8ac90f6824fc44d2e55a82503ddfc95defb19ae0 (git)
Affected: b0abcd65ec545701b8793e12bc27dc98042b151a , < b220bed63330c0e1733dc06ea8e75d5b9962b6b6 (git)
Affected: 538c26d9bf70c90edc460d18c81008a4e555925a (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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When crypto_aead_encrypt/decrypt() returns -EINPROGRESS,\\nthe operation completes asynchronously. Without crypto_wait_req(),\\nthe function immediately frees the request buffer, leading to crashes\\nwhen the driver later accesses the freed memory.\\n\\nThis results in a use-after-free condition when the hardware crypto\\ndriver later accesses the freed request structure, leading to kernel\\ncrashes with NULL pointer dereferences.\\n\\nThe issue occurs because crypto_alloc_aead() with mask=0 doesn\u0027t\\nguarantee synchronous operation. Even without CRYPTO_ALG_ASYNC in\\nthe mask, async implementations can be selected.\\n\\nFix by restoring the async crypto handling:\\n- DECLARE_CRYPTO_WAIT(wait) for completion tracking\\n- aead_request_set_callback() for async completion notification\\n- crypto_wait_req() to wait for operation completion\\n\\nThis ensures the request buffer isn\u0027t freed until the crypto operation\\ncompletes, whether synchronous or asynchronous, while preserving the\\nCVE-2024-50047 fix.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: correcci\u00f3n del use-after-free en crypt_message al usar criptograf\u00eda as\u00edncrona. La correcci\u00f3n CVE-2024-50047 elimin\u00f3 el manejo de criptograf\u00eda as\u00edncrona de crypt_message(), asumiendo que todas las operaciones de criptograf\u00eda son s\u00edncronas. Sin embargo, cuando se usan aceleradores de criptograf\u00eda de hardware, esto puede causar fallos de use-after-free: crypt_message() // Asignar el b\u00fafer creq que contiene la solicitud creq = smb2_get_aead_req(..., \u0026amp;req); // El cifrado as\u00edncrono devuelve -EINPROGRESS inmediatamente rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req); // Liberar creq mientras la operaci\u00f3n as\u00edncrona a\u00fan est\u00e1 en progreso kvfree_sensitive(creq, ...); Los m\u00f3dulos de criptograf\u00eda de hardware a menudo implementan operaciones AEAD as\u00edncronas para mejorar el rendimiento. Cuando crypto_aead_encrypt/decrypt() devuelve -EINPROGRESS, la operaci\u00f3n se completa de forma as\u00edncrona. Sin crypto_wait_req(), la funci\u00f3n libera inmediatamente el b\u00fafer de solicitud, lo que provoca fallos cuando el controlador accede posteriormente a la memoria liberada. Esto genera una condici\u00f3n de use-after-free cuando el controlador de cifrado de hardware accede posteriormente a la estructura de solicitud liberada, lo que provoca fallos del kernel con desreferencias de punteros NULL. El problema se produce porque crypto_alloc_aead() con mask=0 no garantiza la operaci\u00f3n s\u00edncrona. Incluso sin CRYPTO_ALG_ASYNC en la m\u00e1scara, se pueden seleccionar implementaciones as\u00edncronas. Soluci\u00f3n restaurando el manejo de criptograf\u00eda as\u00edncrona: - DECLARE_CRYPTO_WAIT(wait) para seguimiento de finalizaci\u00f3n - aead_request_set_callback() para notificaci\u00f3n de finalizaci\u00f3n as\u00edncrona - crypto_wait_req() para esperar a que se complete la operaci\u00f3n Esto garantiza que el b\u00fafer de solicitud no se libere hasta que se complete la operaci\u00f3n de criptograf\u00eda, ya sea sincr\u00f3nica o asincr\u00f3nica, al tiempo que se conserva la correcci\u00f3n CVE-2024-50047.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.237\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"79C9B191-D12F-428B-9EEA-30BDCC83120A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.181\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"61ADEC7C-D645-4175-8A33-7EB9E14A8FF4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.128\",\"versionEndExcluding\":\"6.1.147\",\"matchCriteriaId\":\"8D856FFA-04F3-4A37-9907-A0BCF6B2031E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.57\",\"versionEndExcluding\":\"6.6.100\",\"matchCriteriaId\":\"A4038CF7-63A2-4668-9428-4300CE199E7F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11.4\",\"versionEndExcluding\":\"6.12.40\",\"matchCriteriaId\":\"B5676E16-8352-46DA-ADBA-D1030B261D95\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.8\",\"matchCriteriaId\":\"C7AFE5B0-F3B1-4D30-B8BF-EDA0385C4746\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D4894DB-CCFE-4602-B1BF-3960B2E19A01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"09709862-E348-4378-8632-5A7813EDDC86\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"415BF58A-8197-43F5-B3D7-D1D63057A26E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A0517869-312D-4429-80C2-561086E1421C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"85421F4E-C863-4ABF-B4B4-E887CC2F7F92\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"3827F0D4-5FEE-4181-B267-5A45E7CA11FC\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/15a0a5de49507062bc3be4014a403d8cea5533de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2a76bc2b24ed889a689fb1c9015307bf16aafb5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5d047b12f86cc3b9fde1171c02d9bccf4dba0632\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6550b2bef095d0dd2d2c8390d2ea4c3837028833\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8ac90f6824fc44d2e55a82503ddfc95defb19ae0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9a1d3e8d40f151c2d5a5f40c410e6e433f62f438\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b220bed63330c0e1733dc06ea8e75d5b9962b6b6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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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

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.