{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"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->size 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->sid.sub_auth[i] for\ni < min(local_sid->num_subauth, ace->sid.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 >= 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().", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53390" }, { "summary":"CVE-2026-53390 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-53390.json" }, { "summary":"openEuler-SA-2026-3317", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3317" }, { "summary":"CVE-2026-53390", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-53390&packageName=kernel" } ], "title":"openEuler cve CVE-2026-53390", "tracking":{ "initial_release_date":"2026-08-19T11:07:48+08:00", "revision_history":[ { "date":"2026-08-19T11:07:48+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-08-19T11:07:48+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-08-19T11:07:48+08:00", "id":"CVE-2026-53390", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"x86_64", "branches":[ { "product":{ 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ace->sid.sub_auth[i] for\ni < min(local_sid->num_subauth, ace->sid.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 >= 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().", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-328.0.0.229.oe2203sp4.x86_64", 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"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version":"3.1" }, "products":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-tools-debuginfo-5.10.0-328.0.0.229.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-tools-devel-5.10.0-328.0.0.229.oe2203sp4.x86_64", 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