{"api_version":"1","generated_at":"2026-08-22T19:59:28+00:00","cve":"CVE-2026-74477","urls":{"html":"https://cve.report/CVE-2026-74477","api":"https://cve.report/api/cve/CVE-2026-74477.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74477","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74477"},"summary":{"title":"uprobes: Fix NULL pointer dereference in hprobe_expire()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  Oops: 0002 [#1] SMP NOPTI\n  RIP: 0010:hprobe_expire\n  CR2: 0000000000000018\n  Call Trace:\n   uprobe_copy_process\n   copy_process\n   kernel_clone\n   __x64_sys_clone\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI've got the impression that this is what is happening:\n\n  CPU 1                          CPU 2 (traced task)\n  -----                          -------------------\n                                 hit uprobe, prepare_uretprobe():\n                                   hprobe LEASED, refcount >= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -> 0\n                                 fork() -> dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -> NULL\n                                     get_uprobe(NULL)   <-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:52","updated_at":"2026-08-17 06:19:43"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0","name":"https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa","name":"https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd","name":"https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74477","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74477","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dd1a7567784e2b1f80258be04f57bcfa82c997eb 3bd35a5e272a1b7a3fb43acad9bdc599281b13fa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dd1a7567784e2b1f80258be04f57bcfa82c997eb 06c275a6c0a953ef1d763d11a6891fcc69ae2ac0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dd1a7567784e2b1f80258be04f57bcfa82c997eb cc679d7a6303e84d769f2afcde1fc51c51f127cd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.44 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.8 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74477","cve":"CVE-2026-74477","epss":"0.001660000","percentile":"0.063150000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:46"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/events/uprobes.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3bd35a5e272a1b7a3fb43acad9bdc599281b13fa","status":"affected","version":"dd1a7567784e2b1f80258be04f57bcfa82c997eb","versionType":"git"},{"lessThan":"06c275a6c0a953ef1d763d11a6891fcc69ae2ac0","status":"affected","version":"dd1a7567784e2b1f80258be04f57bcfa82c997eb","versionType":"git"},{"lessThan":"cc679d7a6303e84d769f2afcde1fc51c51f127cd","status":"affected","version":"dd1a7567784e2b1f80258be04f57bcfa82c997eb","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/events/uprobes.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.44","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  Oops: 0002 [#1] SMP NOPTI\n  RIP: 0010:hprobe_expire\n  CR2: 0000000000000018\n  Call Trace:\n   uprobe_copy_process\n   copy_process\n   kernel_clone\n   __x64_sys_clone\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI've got the impression that this is what is happening:\n\n  CPU 1                          CPU 2 (traced task)\n  -----                          -------------------\n                                 hit uprobe, prepare_uretprobe():\n                                   hprobe LEASED, refcount >= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -> 0\n                                 fork() -> dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -> NULL\n                                     get_uprobe(NULL)   <-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return."}],"providerMetadata":{"dateUpdated":"2026-08-17T05:20:09.952Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"},{"url":"https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"},{"url":"https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"}],"title":"uprobes: Fix NULL pointer dereference in hprobe_expire()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74477","datePublished":"2026-08-15T12:27:11.938Z","dateReserved":"2026-08-15T05:44:03.903Z","dateUpdated":"2026-08-17T05:20:09.952Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:52","lastModifiedDate":"2026-08-17 06:19:43","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74477","Ordinal":"1","Title":"uprobes: Fix NULL pointer dereference in hprobe_expire()","CVE":"CVE-2026-74477","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74477","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  Oops: 0002 [#1] SMP NOPTI\n  RIP: 0010:hprobe_expire\n  CR2: 0000000000000018\n  Call Trace:\n   uprobe_copy_process\n   copy_process\n   kernel_clone\n   __x64_sys_clone\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI've got the impression that this is what is happening:\n\n  CPU 1                          CPU 2 (traced task)\n  -----                          -------------------\n                                 hit uprobe, prepare_uretprobe():\n                                   hprobe LEASED, refcount >= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -> 0\n                                 fork() -> dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -> NULL\n                                     get_uprobe(NULL)   <-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return.","Type":"Description","Title":"uprobes: Fix NULL pointer dereference in hprobe_expire()"}]}}}