{"api_version":"1","generated_at":"2026-06-04T17:43:15+00:00","cve":"CVE-2026-46106","urls":{"html":"https://cve.report/CVE-2026-46106","api":"https://cve.report/api/cve/CVE-2026-46106.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46106","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46106"},"summary":{"title":"eventfs: Hold eventfs_mutex and SRCU when remount walks events","description":"In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Hold eventfs_mutex and SRCU when remount walks events\n\nCommit 340f0c7067a9 (\"eventfs: Update all the eventfs_inodes from the\nevents descriptor\") had eventfs_set_attrs() recurse through ei->children\non remount.  The walk only holds the rcu_read_lock() taken by\ntracefs_apply_options() over tracefs_inodes, which is wrong:\n\n  - list_for_each_entry over ei->children races with the list_del_rcu()\n    in eventfs_remove_rec() -- LIST_POISON1 deref, same shape as\n    d2603279c7d6.\n  - eventfs_inodes are freed via call_srcu(&eventfs_srcu, ...).\n    rcu_read_lock() does not extend an SRCU grace period, so ti->private\n    can be reclaimed under the walk.\n  - The writes to ei->attr race with eventfs_set_attr(), which holds\n    eventfs_mutex.\n\nReproducer:\n\n  while :; do mount -o remount,uid=$((RANDOM%1000)) /sys/kernel/tracing; done &\n  while :; do\n      echo \"p:kp submit_bio\" > /sys/kernel/tracing/kprobe_events\n      echo > /sys/kernel/tracing/kprobe_events\n  done\n\nWrap the events portion of tracefs_apply_options() in\neventfs_remount_lock()/_unlock() that take eventfs_mutex and\nsrcu_read_lock(&eventfs_srcu).  eventfs_set_attrs() doesn't sleep so the\nnested rcu_read_lock() is fine; lockdep_assert_held() pins the contract.\n\nComment in tracefs_drop_inode() said \"RCU cycle\" -- it is SRCU.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-28 10:16:25","updated_at":"2026-05-28 13:44:01"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/07004a8c4b572171934390148ee48c4175c77eed","name":"https://git.kernel.org/stable/c/07004a8c4b572171934390148ee48c4175c77eed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae9cd0b46b1890040006a2fc5e905c5d6053fd02","name":"https://git.kernel.org/stable/c/ae9cd0b46b1890040006a2fc5e905c5d6053fd02","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/52b109f1b875b912d4ab2c5fdd8c322d47119d9b","name":"https://git.kernel.org/stable/c/52b109f1b875b912d4ab2c5fdd8c322d47119d9b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/44e64d8a432837308f4dda3ffe819f1ec092a0ba","name":"https://git.kernel.org/stable/c/44e64d8a432837308f4dda3ffe819f1ec092a0ba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ed2ad73bcb0a7a6cc934097d4853b6d5124c317e","name":"https://git.kernel.org/stable/c/ed2ad73bcb0a7a6cc934097d4853b6d5124c317e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46106","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46106","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ec535ed8724d18ae4e714d2277a5b89450659d2 ae9cd0b46b1890040006a2fc5e905c5d6053fd02 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340f0c7067a95281ad13734f8225f49c6cf52067 44e64d8a432837308f4dda3ffe819f1ec092a0ba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340f0c7067a95281ad13734f8225f49c6cf52067 52b109f1b875b912d4ab2c5fdd8c322d47119d9b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340f0c7067a95281ad13734f8225f49c6cf52067 ed2ad73bcb0a7a6cc934097d4853b6d5124c317e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 340f0c7067a95281ad13734f8225f49c6cf52067 07004a8c4b572171934390148ee48c4175c77eed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 99b86d85f7c73d676c50e8c35748f94dd41389da git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.35 6.6.140 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9.6 6.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.88 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.30 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.7 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46106","cve":"CVE-2026-46106","epss":"0.000180000","percentile":"0.050770000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:21"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/tracefs/event_inode.c","fs/tracefs/inode.c","fs/tracefs/internal.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ae9cd0b46b1890040006a2fc5e905c5d6053fd02","status":"affected","version":"7ec535ed8724d18ae4e714d2277a5b89450659d2","versionType":"git"},{"lessThan":"44e64d8a432837308f4dda3ffe819f1ec092a0ba","status":"affected","version":"340f0c7067a95281ad13734f8225f49c6cf52067","versionType":"git"},{"lessThan":"52b109f1b875b912d4ab2c5fdd8c322d47119d9b","status":"affected","version":"340f0c7067a95281ad13734f8225f49c6cf52067","versionType":"git"},{"lessThan":"ed2ad73bcb0a7a6cc934097d4853b6d5124c317e","status":"affected","version":"340f0c7067a95281ad13734f8225f49c6cf52067","versionType":"git"},{"lessThan":"07004a8c4b572171934390148ee48c4175c77eed","status":"affected","version":"340f0c7067a95281ad13734f8225f49c6cf52067","versionType":"git"},{"status":"affected","version":"99b86d85f7c73d676c50e8c35748f94dd41389da","versionType":"git"},{"lessThan":"6.6.140","status":"affected","version":"6.6.35","versionType":"semver"},{"lessThan":"6.10","status":"affected","version":"6.9.6","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/tracefs/event_inode.c","fs/tracefs/inode.c","fs/tracefs/internal.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.10"},{"lessThan":"6.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.88","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.30","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"6.6.35","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.88","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.30","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.7","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Hold eventfs_mutex and SRCU when remount walks events\n\nCommit 340f0c7067a9 (\"eventfs: Update all the eventfs_inodes from the\nevents descriptor\") had eventfs_set_attrs() recurse through ei->children\non remount.  The walk only holds the rcu_read_lock() taken by\ntracefs_apply_options() over tracefs_inodes, which is wrong:\n\n  - list_for_each_entry over ei->children races with the list_del_rcu()\n    in eventfs_remove_rec() -- LIST_POISON1 deref, same shape as\n    d2603279c7d6.\n  - eventfs_inodes are freed via call_srcu(&eventfs_srcu, ...).\n    rcu_read_lock() does not extend an SRCU grace period, so ti->private\n    can be reclaimed under the walk.\n  - The writes to ei->attr race with eventfs_set_attr(), which holds\n    eventfs_mutex.\n\nReproducer:\n\n  while :; do mount -o remount,uid=$((RANDOM%1000)) /sys/kernel/tracing; done &\n  while :; do\n      echo \"p:kp submit_bio\" > /sys/kernel/tracing/kprobe_events\n      echo > /sys/kernel/tracing/kprobe_events\n  done\n\nWrap the events portion of tracefs_apply_options() in\neventfs_remount_lock()/_unlock() that take eventfs_mutex and\nsrcu_read_lock(&eventfs_srcu).  eventfs_set_attrs() doesn't sleep so the\nnested rcu_read_lock() is fine; lockdep_assert_held() pins the contract.\n\nComment in tracefs_drop_inode() said \"RCU cycle\" -- it is SRCU."}],"providerMetadata":{"dateUpdated":"2026-05-28T09:35:11.034Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ae9cd0b46b1890040006a2fc5e905c5d6053fd02"},{"url":"https://git.kernel.org/stable/c/44e64d8a432837308f4dda3ffe819f1ec092a0ba"},{"url":"https://git.kernel.org/stable/c/52b109f1b875b912d4ab2c5fdd8c322d47119d9b"},{"url":"https://git.kernel.org/stable/c/ed2ad73bcb0a7a6cc934097d4853b6d5124c317e"},{"url":"https://git.kernel.org/stable/c/07004a8c4b572171934390148ee48c4175c77eed"}],"title":"eventfs: Hold eventfs_mutex and SRCU when remount walks events","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46106","datePublished":"2026-05-28T09:35:11.034Z","dateReserved":"2026-05-13T15:03:33.097Z","dateUpdated":"2026-05-28T09:35:11.034Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 10:16:25","lastModifiedDate":"2026-05-28 13:44:01","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46106","Ordinal":"1","Title":"eventfs: Hold eventfs_mutex and SRCU when remount walks events","CVE":"CVE-2026-46106","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46106","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Hold eventfs_mutex and SRCU when remount walks events\n\nCommit 340f0c7067a9 (\"eventfs: Update all the eventfs_inodes from the\nevents descriptor\") had eventfs_set_attrs() recurse through ei->children\non remount.  The walk only holds the rcu_read_lock() taken by\ntracefs_apply_options() over tracefs_inodes, which is wrong:\n\n  - list_for_each_entry over ei->children races with the list_del_rcu()\n    in eventfs_remove_rec() -- LIST_POISON1 deref, same shape as\n    d2603279c7d6.\n  - eventfs_inodes are freed via call_srcu(&eventfs_srcu, ...).\n    rcu_read_lock() does not extend an SRCU grace period, so ti->private\n    can be reclaimed under the walk.\n  - The writes to ei->attr race with eventfs_set_attr(), which holds\n    eventfs_mutex.\n\nReproducer:\n\n  while :; do mount -o remount,uid=$((RANDOM%1000)) /sys/kernel/tracing; done &\n  while :; do\n      echo \"p:kp submit_bio\" > /sys/kernel/tracing/kprobe_events\n      echo > /sys/kernel/tracing/kprobe_events\n  done\n\nWrap the events portion of tracefs_apply_options() in\neventfs_remount_lock()/_unlock() that take eventfs_mutex and\nsrcu_read_lock(&eventfs_srcu).  eventfs_set_attrs() doesn't sleep so the\nnested rcu_read_lock() is fine; lockdep_assert_held() pins the contract.\n\nComment in tracefs_drop_inode() said \"RCU cycle\" -- it is SRCU.","Type":"Description","Title":"eventfs: Hold eventfs_mutex and SRCU when remount walks events"}]}}}