{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "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\nima: Handle error code returned by ima_filter_rule_match()\n\nIn ima_match_rules(), if ima_filter_rule_match() returns -ENOENT due to\nthe rule being NULL, the function incorrectly skips the 'if (!rc)' check\nand sets 'result = true'. The LSM rule is considered a match, causing\nextra files to be measured by IMA.\n\nThis issue can be reproduced in the following scenario:\nAfter unloading the SELinux policy module via 'semodule -d', if an IMA\nmeasurement is triggered before ima_lsm_rules is updated,\nin ima_match_rules(), the first call to ima_filter_rule_match() returns\n-ESTALE. This causes the code to enter the 'if (rc == -ESTALE &&\n!rule_reinitialized)' block, perform ima_lsm_copy_rule() and retry. In\nima_lsm_copy_rule(), since the SELinux module has been removed, the rule\nbecomes NULL, and the second call to ima_filter_rule_match() returns\n-ENOENT. This bypasses the 'if (!rc)' check and results in a false match.\n\nCall trace:\n selinux_audit_rule_match+0x310/0x3b8\n security_audit_rule_match+0x60/0xa0\n ima_match_rules+0x2e4/0x4a0\n ima_match_policy+0x9c/0x1e8\n ima_get_action+0x48/0x60\n process_measurement+0xf8/0xa98\n ima_bprm_check+0x98/0xd8\n security_bprm_check+0x5c/0x78\n search_binary_handler+0x6c/0x318\n exec_binprm+0x58/0x1b8\n bprm_execve+0xb8/0x130\n do_execveat_common.isra.0+0x1a8/0x258\n __arm64_sys_execve+0x48/0x68\n invoke_syscall+0x50/0x128\n el0_svc_common.constprop.0+0xc8/0xf0\n do_el0_svc+0x24/0x38\n el0_svc+0x44/0x200\n el0t_64_sync_handler+0x100/0x130\n el0t_64_sync+0x3c8/0x3d0\n\nFix this by changing 'if (!rc)' to 'if (rc <= 0)' to ensure that error\ncodes like -ENOENT do not bypass the check and accidentally result in a\nsuccessful match.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68740" }, { "summary":"CVE-2025-68740 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2025/csaf-openeuler-cve-2025-68740.json" }, { "summary":"openEuler-SA-2026-2418", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2418" }, { "summary":"CVE-2025-68740", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2025-68740&packageName=kernel" } ], "title":"openEuler cve CVE-2025-68740", "tracking":{ "initial_release_date":"2026-05-25T10:43:01+08:00", "revision_history":[ { "date":"2026-05-25T10:43:01+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-05-25T10:43:01+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-05-25T10:43:01+08:00", "id":"CVE-2025-68740", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { 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rule being NULL, the function incorrectly skips the 'if (!rc)' check\nand sets 'result = true'. The LSM rule is considered a match, causing\nextra files to be measured by IMA.\n\nThis issue can be reproduced in the following scenario:\nAfter unloading the SELinux policy module via 'semodule -d', if an IMA\nmeasurement is triggered before ima_lsm_rules is updated,\nin ima_match_rules(), the first call to ima_filter_rule_match() returns\n-ESTALE. This causes the code to enter the 'if (rc == -ESTALE &&\n!rule_reinitialized)' block, perform ima_lsm_copy_rule() and retry. In\nima_lsm_copy_rule(), since the SELinux module has been removed, the rule\nbecomes NULL, and the second call to ima_filter_rule_match() returns\n-ENOENT. This bypasses the 'if (!rc)' check and results in a false match.\n\nCall trace:\n selinux_audit_rule_match+0x310/0x3b8\n security_audit_rule_match+0x60/0xa0\n ima_match_rules+0x2e4/0x4a0\n ima_match_policy+0x9c/0x1e8\n ima_get_action+0x48/0x60\n process_measurement+0xf8/0xa98\n ima_bprm_check+0x98/0xd8\n security_bprm_check+0x5c/0x78\n search_binary_handler+0x6c/0x318\n exec_binprm+0x58/0x1b8\n bprm_execve+0xb8/0x130\n do_execveat_common.isra.0+0x1a8/0x258\n __arm64_sys_execve+0x48/0x68\n invoke_syscall+0x50/0x128\n el0_svc_common.constprop.0+0xc8/0xf0\n do_el0_svc+0x24/0x38\n el0_svc+0x44/0x200\n el0t_64_sync_handler+0x100/0x130\n el0t_64_sync+0x3c8/0x3d0\n\nFix this by changing 'if (!rc)' to 'if (rc <= 0)' to ensure that error\ncodes like -ENOENT do not bypass the check and accidentally result in a\nsuccessful match.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } }, "remediations":[ { "product_ids":{ "$ref":"$.vulnerabilities[0].product_status.fixed" }, "details":"kernel security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2418" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":5.5, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":{ "$ref":"$.vulnerabilities[0].product_status.fixed" } } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2025-68740" } ] }