{"id":"CVE-2026-97923","revision":"d82a9bb80ab94154ab7274c0e3cbd542","records":[{"revision":"d82a9bb80ab94154ab7274c0e3cbd542","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97923","aliases":[],"title":"tracing: Free histogram the var ref when its initialization fails","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Free histogram the var ref when its initialization fails\n\ncreate_var_ref() allocates a VAR_REF hist_field and then calls\ninit_var_ref() to fill it in. When that fails the field is leaked.\n\ncommit 656fe2ba85e8 (\"tracing: Use hist trigger's var_ref array to destroy\nvar_refs\") made destroy_hist_field() return early for\nHIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's\nvar_refs[] array instead. create_var_ref() adds the field to that array\nonly after init_var_ref() has succeeded, so on this path the field is in\nneither place and nothing frees it. The call was correct when it was\nwritten, before var refs were taken out of destroy_hist_field().\n\ninit_var_ref() cannot free it either. The caller owns the field, so\ninit_var_ref() undoes only its own string allocations and leaves the\nfield alone. Freeing it there would leave create_var_ref() passing freed\nmemory to destroy_hist_field(), which reads its flags.\n\nCall __destroy_hist_field(), which frees the field without consulting\nthe flag.","state":0,"publishedAt":"2026-09-25T10:22:42.3+00:00","modifiedAt":"2026-10-19T09:10:50.106+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/trace_events_hist.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"608b7751926ec08fae6a1ac4e7308195da68c362\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"4870f9071c9ea3c1423a07741b85a794db30d672\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"352f84a381e7b4651b30366e93cb858f3fa9c91a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"4924328d6991f25b65bb7c8ff5d56c2a9b254851\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"74375caa20fe5165807b4334c783d1790b01f02a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"222abcbe7866fef04563b6eb89fb21f627dcbc77\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"a69baeac38677270656e85753d93856a076dee57\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"656fe2ba85e81d00e4447bf77b8da2be3c47acb2\",\n                            \"lessThan\": \"516001d53e6b2ea95a251ee2ef54a1a689a3fd58\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"836717841a30d7845cdf9cb806ee0ff3bfa7135a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4.19.100\",\n                            \"lessThan\": \"4.20\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/trace_events_hist.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/608b7751926ec08fae6a1ac4e7308195da68c362","https://git.kernel.org/stable/c/4870f9071c9ea3c1423a07741b85a794db30d672","https://git.kernel.org/stable/c/352f84a381e7b4651b30366e93cb858f3fa9c91a","https://git.kernel.org/stable/c/4924328d6991f25b65bb7c8ff5d56c2a9b254851","https://git.kernel.org/stable/c/74375caa20fe5165807b4334c783d1790b01f02a","https://git.kernel.org/stable/c/222abcbe7866fef04563b6eb89fb21f627dcbc77","https://git.kernel.org/stable/c/a69baeac38677270656e85753d93856a076dee57","https://git.kernel.org/stable/c/516001d53e6b2ea95a251ee2ef54a1a689a3fd58"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97923","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97923","identifiers":["CVE-2026-97923"]},"retained":false,"historicalAffected":[]}],"coverage":[]}