{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74314", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.883Z", "datePublished": "2026-08-15T05:58:12.766Z", "dateUpdated": "2026-08-15T05:58:12.766Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T05:58:12.766Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Cancel special fields on map value recycle\n\nMap update and delete paths currently call bpf_obj_free_fields() when a\nvalue is being replaced or recycled. That makes field destruction depend\non the context of the update/delete operation. For tracing programs this\ncan include NMI context, where referenced kptr destructors, uptr\nunpinning, and graph root destruction are not generally safe.\n\nIntroduce bpf_obj_cancel_fields() for the reusable-value path. It only\nperforms NMI-safe cleanup for timer, workqueue, and task_work fields.\nFields that need full destruction are left attached to the recycled value\nand are destroyed by the final cleanup path instead.\n\nSwitch array and hashtab update/delete/recycle paths to this cancel\nhelper. Keep bpf_obj_free_fields() for final map destruction and for\nbpf_mem_alloc destructors. Preallocated hashtabs do not have allocator\ndestructors, so teardown continues to walk the normal and extra elements\nand fully destroy their fields.\n\nThis deliberately relaxes the eager-free semantics of map update/delete\nfor special fields. Programs that relied on a recycled map slot becoming\nempty immediately after update/delete were relying on behavior that\ncannot be implemented safely from every BPF execution context without\noffloading arbitrary destructors.\n\nThere is a chance this change breaks programs making assumptions\nregarding the eager freeing of fields. If so, we can relax semantics to\ncancellation only when irqs_disabled() is true in the future. However,\ntheoretically, map values that get reused eagerly already have weaker\nguarantees as parallel users can recreate freed fields before the new\nelement becomes visible again."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bpf.h", "kernel/bpf/arraymap.c", "kernel/bpf/hashtab.c", "kernel/bpf/syscall.c", "tools/testing/selftests/bpf/prog_tests/htab_update.c", "tools/testing/selftests/bpf/prog_tests/linked_list.c", "tools/testing/selftests/bpf/prog_tests/map_kptr.c", "tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c", "tools/testing/selftests/bpf/progs/htab_update.c", "tools/testing/selftests/bpf/progs/linked_list.c", "tools/testing/selftests/bpf/progs/refcounted_kptr.c"], "versions": [{"version": "14a324f6a67ef6a53e04362a70160a47eb8afffa", "lessThan": "9ea734e2cc0143d7429ab7dc0b20c85e5836183c", "status": "affected", "versionType": "git"}, {"version": "14a324f6a67ef6a53e04362a70160a47eb8afffa", "lessThan": "a3a81d247651218e47153f2d2afd7aee236726fd", "status": "affected", "versionType": "git"}, {"version": "f0462d38589422bc9e27fd3c6343dfeb6b3db2f9", "status": "affected", "versionType": "git"}, {"version": "5.18.18", "lessThan": "5.19", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bpf.h", "kernel/bpf/arraymap.c", "kernel/bpf/hashtab.c", "kernel/bpf/syscall.c", "tools/testing/selftests/bpf/prog_tests/htab_update.c", "tools/testing/selftests/bpf/prog_tests/linked_list.c", "tools/testing/selftests/bpf/prog_tests/map_kptr.c", "tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c", "tools/testing/selftests/bpf/progs/htab_update.c", "tools/testing/selftests/bpf/progs/linked_list.c", "tools/testing/selftests/bpf/progs/refcounted_kptr.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2-rc1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9ea734e2cc0143d7429ab7dc0b20c85e5836183c"}, {"url": "https://git.kernel.org/stable/c/a3a81d247651218e47153f2d2afd7aee236726fd"}], "title": "bpf: Cancel special fields on map value recycle", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/bpf.h", "kernel/bpf/arraymap.c", "kernel/bpf/hashtab.c", "kernel/bpf/syscall.c", "tools/testing/selftests/bpf/prog_tests/htab_update.c", "tools/testing/selftests/bpf/prog_tests/linked_list.c", "tools/testing/selftests/bpf/prog_tests/map_kptr.c", "tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c", "tools/testing/selftests/bpf/progs/htab_update.c", "tools/testing/selftests/bpf/progs/linked_list.c", "tools/testing/selftests/bpf/progs/refcounted_kptr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9ea734e2cc0143d7429ab7dc0b20c85e5836183c", "status": "affected", "version": "14a324f6a67ef6a53e04362a70160a47eb8afffa", "versionType": "git"}, {"lessThan": "a3a81d247651218e47153f2d2afd7aee236726fd", "status": "affected", "version": "14a324f6a67ef6a53e04362a70160a47eb8afffa", "versionType": "git"}, {"status": "affected", "version": "f0462d38589422bc9e27fd3c6343dfeb6b3db2f9", "versionType": "git"}, {"lessThan": "5.19", "status": "affected", "version": "5.18.18", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/bpf.h", "kernel/bpf/arraymap.c", "kernel/bpf/hashtab.c", "kernel/bpf/syscall.c", "tools/testing/selftests/bpf/prog_tests/htab_update.c", "tools/testing/selftests/bpf/prog_tests/linked_list.c", "tools/testing/selftests/bpf/prog_tests/map_kptr.c", "tools/testing/selftests/bpf/prog_tests/refcounted_kptr.c", "tools/testing/selftests/bpf/progs/htab_update.c", "tools/testing/selftests/bpf/progs/linked_list.c", "tools/testing/selftests/bpf/progs/refcounted_kptr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.19"}, {"lessThan": "5.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Cancel special fields on map value recycle\n\nMap update and delete paths currently call bpf_obj_free_fields() when a\nvalue is being replaced or recycled. That makes field destruction depend\non the context of the update/delete operation. For tracing programs this\ncan include NMI context, where referenced kptr destructors, uptr\nunpinning, and graph root destruction are not generally safe.\n\nIntroduce bpf_obj_cancel_fields() for the reusable-value path. It only\nperforms NMI-safe cleanup for timer, workqueue, and task_work fields.\nFields that need full destruction are left attached to the recycled value\nand are destroyed by the final cleanup path instead.\n\nSwitch array and hashtab update/delete/recycle paths to this cancel\nhelper. Keep bpf_obj_free_fields() for final map destruction and for\nbpf_mem_alloc destructors. Preallocated hashtabs do not have allocator\ndestructors, so teardown continues to walk the normal and extra elements\nand fully destroy their fields.\n\nThis deliberately relaxes the eager-free semantics of map update/delete\nfor special fields. Programs that relied on a recycled map slot becoming\nempty immediately after update/delete were relying on behavior that\ncannot be implemented safely from every BPF execution context without\noffloading arbitrary destructors.\n\nThere is a chance this change breaks programs making assumptions\nregarding the eager freeing of fields. If so, we can relax semantics to\ncancellation only when irqs_disabled() is true in the future. However,\ntheoretically, map values that get reused eagerly already have weaker\nguarantees as parallel users can recreate freed fields before the new\nelement becomes visible again."}], "id": "CVE-2026-74314", "lastModified": "2026-08-15T06:22:31.617", "metrics": {}, "published": "2026-08-15T06:22:31.617", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ea734e2cc0143d7429ab7dc0b20c85e5836183c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3a81d247651218e47153f2d2afd7aee236726fd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"created": "2026-08-15T16:45:10.769850+00:00", "updated": "2026-08-15T16:45:10.769857+00:00", "vendors": [], "weaknesses": ["CWE-416", "CWE-362"]}