CVE-2026-53390 (GCVE-0-2026-53390)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:01 – Updated: 2026-07-20 13:39
VLAI
Title
ksmbd: fix out-of-bounds read in smb_check_perm_dacl()
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bounds read in smb_check_perm_dacl() The permission-check ACE walk in smb_check_perm_dacl() validates the ACE header size and caps sid.num_subauth at SID_MAX_SUB_AUTHORITIES, but it never checks that ace->size is actually large enough to contain num_subauth sub-authorities before compare_sids() dereferences them. CIFS_SID_BASE_SIZE covers the SID header up to but excluding the sub_auth[] array, and offsetof(struct smb_ace, sid) is the ACE header, so the existing guards only guarantee the 8-byte SID base, i.e. zero sub-authorities. compare_sids() then reads ace->sid.sub_auth[i] for i < min(local_sid->num_subauth, ace->sid.num_subauth). The local comparison SIDs (sid_everyone, sid_unix_NFS_mode, and the id_to_sid() result) always have at least one sub-authority, and an attacker controls the ACE revision and authority bytes (which lie within the in-bounds SID base), so they can match one of those SIDs and force the sub_auth read. A crafted ACE with size == 16 and num_subauth >= 1 placed at the tail of the security descriptor therefore causes a heap out-of-bounds read of up to SID_MAX_SUB_AUTHORITIES * sizeof(__le32) bytes past the pntsd allocation. The security descriptor is loaded by ksmbd_vfs_get_sd_xattr() into a buffer sized exactly to the on-disk data (kzalloc(sd_size) in ndr_decode_v4_ntacl()), so the read lands past the allocation. The malformed descriptor can be stored verbatim via SMB2_SET_INFO (the DACL is not normalised before being written to the security.NTACL xattr) and the read fires on a subsequent SMB2_CREATE access check, making this reachable by an authenticated client on a share that uses ACL xattrs. Add the missing num_subauth-versus-ace_size check, mirroring the identical guards already present in the sibling parsers parse_dacl() and smb_inherit_dacl().
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f20adc4ef7428bc485ee83fd1a592252fb87718b , < 988c93d3bba066d8669143e6ec30bb2be9608d53 (git)
Affected: 325d4ac11f526cb8964cff14548ccf02d8c756d8 , < 36599894fa8536fefdf1e296c0af71b8b7226859 (git)
Affected: 95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c , < d5c81a095c86fe507c032d08f3a8cfc518444927 (git)
Affected: 90089584b2e25c4510b7b987387b4405f0673ece , < 7627ff8c4f9919f14de562b0160ab4ec9d80b1f7 (git)
Affected: d07b26f39246a82399661936dd0c853983cfade7 , < e36e35660adb9b8ef1435ac359151dda5f094c55 (git)
Affected: d07b26f39246a82399661936dd0c853983cfade7 , < 1ef06004ed4bd6d3ed8c840d9d1a376b66d4935b (git)
Affected: 282cbbb476b9f35793452bc461934af4c7eca169 (git)
Affected: 151b1799861fde38087c08f613abc2843ef597b0 (git)
Affected: 6.1.176 , < 6.1.177 (semver)
Affected: 6.6.140 , < 6.6.144 (semver)
Affected: 6.12.84 , < 6.12.95 (semver)
Affected: 6.18.25 , < 6.18.38 (semver)
Affected: 5.15.210 , < 5.16 (semver)
Affected: 7.0.2 , < 7.1 (semver)
Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out-of-bounds read in smb_check_perm_dacl()\n\nThe permission-check ACE walk in smb_check_perm_dacl() validates the ACE\nheader size and caps sid.num_subauth at SID_MAX_SUB_AUTHORITIES, but it\nnever checks that ace-\u003esize is actually large enough to contain\nnum_subauth sub-authorities before compare_sids() dereferences them.\n\nCIFS_SID_BASE_SIZE covers the SID header up to but excluding the\nsub_auth[] array, and offsetof(struct smb_ace, sid) is the ACE header,\nso the existing guards only guarantee the 8-byte SID base, i.e. zero\nsub-authorities. compare_sids() then reads ace-\u003esid.sub_auth[i] for\ni \u003c min(local_sid-\u003enum_subauth, ace-\u003esid.num_subauth). The local\ncomparison SIDs (sid_everyone, sid_unix_NFS_mode, and the id_to_sid()\nresult) always have at least one sub-authority, and an attacker controls\nthe ACE revision and authority bytes (which lie within the in-bounds SID\nbase), so they can match one of those SIDs and force the sub_auth read.\n\nA crafted ACE with size == 16 and num_subauth \u003e= 1 placed at the tail of\nthe security descriptor therefore causes a heap out-of-bounds read of up\nto SID_MAX_SUB_AUTHORITIES * sizeof(__le32) bytes past the pntsd\nallocation. The security descriptor is loaded by ksmbd_vfs_get_sd_xattr()\ninto a buffer sized exactly to the on-disk data (kzalloc(sd_size) in\nndr_decode_v4_ntacl()), so the read lands past the allocation. The\nmalformed descriptor can be stored verbatim via SMB2_SET_INFO (the DACL\nis not normalised before being written to the security.NTACL xattr) and\nthe read fires on a subsequent SMB2_CREATE access check, making this\nreachable by an authenticated client on a share that uses ACL xattrs.\n\nAdd the missing num_subauth-versus-ace_size check, mirroring the\nidentical guards already present in the sibling parsers parse_dacl() and\nsmb_inherit_dacl()."
        }
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            "baseSeverity": "HIGH",
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          "url": "https://git.kernel.org/stable/c/988c93d3bba066d8669143e6ec30bb2be9608d53"
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    "dateReserved": "2026-06-09T07:44:35.402Z",
    "dateUpdated": "2026-07-20T13:39:53.825Z",
    "state": "PUBLISHED"
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      "epss": "0.00435",
      "percentile": "0.35324"
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      "current_release_date": "2026-07-20T14:46:19.000Z",
      "cve": "CVE-2026-53390",
      "id": "msrc_CVE-2026-53390",
      "initial_release_date": "2026-07-20T01:07:26.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ksmbd: fix out-of-bounds read in smb_check_perm_dacl()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53390.json",
      "version": "2"
    },
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The local\\ncomparison SIDs (sid_everyone, sid_unix_NFS_mode, and the id_to_sid()\\nresult) always have at least one sub-authority, and an attacker controls\\nthe ACE revision and authority bytes (which lie within the in-bounds SID\\nbase), so they can match one of those SIDs and force the sub_auth read.\\n\\nA crafted ACE with size == 16 and num_subauth \u003e= 1 placed at the tail of\\nthe security descriptor therefore causes a heap out-of-bounds read of up\\nto SID_MAX_SUB_AUTHORITIES * sizeof(__le32) bytes past the pntsd\\nallocation. The security descriptor is loaded by ksmbd_vfs_get_sd_xattr()\\ninto a buffer sized exactly to the on-disk data (kzalloc(sd_size) in\\nndr_decode_v4_ntacl()), so the read lands past the allocation. The\\nmalformed descriptor can be stored verbatim via SMB2_SET_INFO (the DACL\\nis not normalised before being written to the security.NTACL xattr) and\\nthe read fires on a subsequent SMB2_CREATE access check, making this\\nreachable by an authenticated client on a share that uses ACL xattrs.\\n\\nAdd the missing num_subauth-versus-ace_size check, mirroring the\\nidentical guards already present in the sibling parsers parse_dacl() and\\nsmb_inherit_dacl().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/server/smbacl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f20adc4ef7428bc485ee83fd1a592252fb87718b\",\"lessThan\":\"988c93d3bba066d8669143e6ec30bb2be9608d53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"325d4ac11f526cb8964cff14548ccf02d8c756d8\",\"lessThan\":\"36599894fa8536fefdf1e296c0af71b8b7226859\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c\",\"lessThan\":\"d5c81a095c86fe507c032d08f3a8cfc518444927\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"90089584b2e25c4510b7b987387b4405f0673ece\",\"lessThan\":\"7627ff8c4f9919f14de562b0160ab4ec9d80b1f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d07b26f39246a82399661936dd0c853983cfade7\",\"lessThan\":\"e36e35660adb9b8ef1435ac359151dda5f094c55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d07b26f39246a82399661936dd0c853983cfade7\",\"lessThan\":\"1ef06004ed4bd6d3ed8c840d9d1a376b66d4935b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"282cbbb476b9f35793452bc461934af4c7eca169\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"151b1799861fde38087c08f613abc2843ef597b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.176\",\"lessThan\":\"6.1.177\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.140\",\"lessThan\":\"6.6.144\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.84\",\"lessThan\":\"6.12.95\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.25\",\"lessThan\":\"6.18.38\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.210\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"7.0.2\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/server/smbacl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1ef06004ed4bd6d3ed8c840d9d1a376b66d4935b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36599894fa8536fefdf1e296c0af71b8b7226859\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7627ff8c4f9919f14de562b0160ab4ec9d80b1f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/988c93d3bba066d8669143e6ec30bb2be9608d53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5c81a095c86fe507c032d08f3a8cfc518444927\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e36e35660adb9b8ef1435ac359151dda5f094c55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:02:56+00:00",
      "cve": "CVE-2026-53390",
      "id": "CVE-2026-53390",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix out-of-bounds read in smb_check_perm_dacl()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53390.json",
      "version": "3"
    }
  }
}



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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.