{"api_version":"1","generated_at":"2026-10-08T08:02:32+00:00","cve":"CVE-2026-98214","urls":{"html":"https://cve.report/CVE-2026-98214","api":"https://cve.report/api/cve/CVE-2026-98214.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98214","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98214"},"summary":{"title":"selinux: recheck intermediate backing files on mprotect()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: recheck intermediate backing files on mprotect()\n\nmprotect() can be used to bypass the SELinux checks that mmap() performs\nagainst the intermediate layers of a stacked filesystem.\n\nmmap() checks every backing layer as the request descends through the\nstack.  mprotect() only has the lowest backing file in vma->vm_file, so it\nrechecks the top-level user and the lowest mounter, but skips the mounters\nof every layer in between.  With two nested overlayfs mounts and a policy\ndenying mounter_t -> middle_file_t:file { execute }, a direct\nmmap(PROT_EXEC) is denied:\n\n  avc:  denied  { execute } for  pid=71 comm=\"nested_exec\"\n    path=\"/payload\" dev=\"overlay\" ino=9\n    scontext=user_u:base_r:mounter_t\n    tcontext=user_u:object_r:middle_file_t tclass=file permissive=0\n\nwhile mmap(PROT_NONE) followed by mprotect(PROT_EXEC) succeeds.\n\nPreserve each intermediate path, mounter SID and file-description SID in\nthe backing-file security blob, copying the saved entries when another\nbacking layer is opened.  Allocate the array only for nested backing files,\nand release it and the path references in the backing_file_free hook.\n\nDuring mprotect(), recheck fd { use } and the requested inode permissions\nfor every saved mounter, and include the intermediate layers in the execmod\nchecks.  Policy for nested stacking may then need to grant intermediate\nmounters what a direct mmap() already requires, and execmod on intermediate\nlabels for binaries using text relocations.\n\nTested on arm64 QEMU with a small BusyBox initramfs and a purpose-built\nSELinux policy, on a mainline tree containing\ncommit f2381b546e7e (\"fs: fix user path of nested backing files\").\n\n[PM: subject tweak]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:07","updated_at":"2026-10-06 09:18:07"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/78fc54b934bfb2c18aad8154c7302067146946f9","name":"https://git.kernel.org/stable/c/78fc54b934bfb2c18aad8154c7302067146946f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d127c7e1f3e1231d8ac8b2738e3f00bea12afe74","name":"https://git.kernel.org/stable/c/d127c7e1f3e1231d8ac8b2738e3f00bea12afe74","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/89376fbfdcc1a728e1775f98752cdd90b0930a00","name":"https://git.kernel.org/stable/c/89376fbfdcc1a728e1775f98752cdd90b0930a00","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c2bbb905af2293549651b614a52ad91e0b462b60","name":"https://git.kernel.org/stable/c/c2bbb905af2293549651b614a52ad91e0b462b60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4d50ebe5a27724e020747ffd61a051dec67cb8ec","name":"https://git.kernel.org/stable/c/4d50ebe5a27724e020747ffd61a051dec67cb8ec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98214","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98214","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bc6c380c1159de52a252ed11f19a42c47f60a735 4d50ebe5a27724e020747ffd61a051dec67cb8ec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8bacd09f12c27710228562e4d13163e58c5f4a45 89376fbfdcc1a728e1775f98752cdd90b0930a00 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d844702198395d3f80222777030f69db6be6b709 d127c7e1f3e1231d8ac8b2738e3f00bea12afe74 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82544d36b1729153c8aeb179e84750f0c085d3b1 c2bbb905af2293549651b614a52ad91e0b462b60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82544d36b1729153c8aeb179e84750f0c085d3b1 78fc54b934bfb2c18aad8154c7302067146946f9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cd0e707a927a70cdfd8bc5a512a9719a87f5ed51 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.144 6.6.158 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.95 6.12.112 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.38 6.18.54 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0.4 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98214","cve":"CVE-2026-98214","epss":"0.002190000","percentile":"0.112830000","score_date":"2026-10-06","updated_at":"2026-10-07 00:14:55"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["security/selinux/hooks.c","security/selinux/include/objsec.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4d50ebe5a27724e020747ffd61a051dec67cb8ec","status":"affected","version":"bc6c380c1159de52a252ed11f19a42c47f60a735","versionType":"git"},{"lessThan":"89376fbfdcc1a728e1775f98752cdd90b0930a00","status":"affected","version":"8bacd09f12c27710228562e4d13163e58c5f4a45","versionType":"git"},{"lessThan":"d127c7e1f3e1231d8ac8b2738e3f00bea12afe74","status":"affected","version":"d844702198395d3f80222777030f69db6be6b709","versionType":"git"},{"lessThan":"c2bbb905af2293549651b614a52ad91e0b462b60","status":"affected","version":"82544d36b1729153c8aeb179e84750f0c085d3b1","versionType":"git"},{"lessThan":"78fc54b934bfb2c18aad8154c7302067146946f9","status":"affected","version":"82544d36b1729153c8aeb179e84750f0c085d3b1","versionType":"git"},{"status":"affected","version":"cd0e707a927a70cdfd8bc5a512a9719a87f5ed51","versionType":"git"},{"lessThan":"6.6.158","status":"affected","version":"6.6.144","versionType":"semver"},{"lessThan":"6.12.112","status":"affected","version":"6.12.95","versionType":"semver"},{"lessThan":"6.18.54","status":"affected","version":"6.18.38","versionType":"semver"},{"lessThan":"7.1","status":"affected","version":"7.0.4","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["security/selinux/hooks.c","security/selinux/include/objsec.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.54","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"6.6.144","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"6.12.95","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"6.18.38","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc4","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: recheck intermediate backing files on mprotect()\n\nmprotect() can be used to bypass the SELinux checks that mmap() performs\nagainst the intermediate layers of a stacked filesystem.\n\nmmap() checks every backing layer as the request descends through the\nstack.  mprotect() only has the lowest backing file in vma->vm_file, so it\nrechecks the top-level user and the lowest mounter, but skips the mounters\nof every layer in between.  With two nested overlayfs mounts and a policy\ndenying mounter_t -> middle_file_t:file { execute }, a direct\nmmap(PROT_EXEC) is denied:\n\n  avc:  denied  { execute } for  pid=71 comm=\"nested_exec\"\n    path=\"/payload\" dev=\"overlay\" ino=9\n    scontext=user_u:base_r:mounter_t\n    tcontext=user_u:object_r:middle_file_t tclass=file permissive=0\n\nwhile mmap(PROT_NONE) followed by mprotect(PROT_EXEC) succeeds.\n\nPreserve each intermediate path, mounter SID and file-description SID in\nthe backing-file security blob, copying the saved entries when another\nbacking layer is opened.  Allocate the array only for nested backing files,\nand release it and the path references in the backing_file_free hook.\n\nDuring mprotect(), recheck fd { use } and the requested inode permissions\nfor every saved mounter, and include the intermediate layers in the execmod\nchecks.  Policy for nested stacking may then need to grant intermediate\nmounters what a direct mmap() already requires, and execmod on intermediate\nlabels for binaries using text relocations.\n\nTested on arm64 QEMU with a small BusyBox initramfs and a purpose-built\nSELinux policy, on a mainline tree containing\ncommit f2381b546e7e (\"fs: fix user path of nested backing files\").\n\n[PM: subject tweak]"}],"providerMetadata":{"dateUpdated":"2026-10-06T08:44:50.209Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4d50ebe5a27724e020747ffd61a051dec67cb8ec"},{"url":"https://git.kernel.org/stable/c/89376fbfdcc1a728e1775f98752cdd90b0930a00"},{"url":"https://git.kernel.org/stable/c/d127c7e1f3e1231d8ac8b2738e3f00bea12afe74"},{"url":"https://git.kernel.org/stable/c/c2bbb905af2293549651b614a52ad91e0b462b60"},{"url":"https://git.kernel.org/stable/c/78fc54b934bfb2c18aad8154c7302067146946f9"}],"title":"selinux: recheck intermediate backing files on mprotect()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98214","datePublished":"2026-10-06T08:44:50.209Z","dateReserved":"2026-09-25T10:25:14.325Z","dateUpdated":"2026-10-06T08:44:50.209Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:07","lastModifiedDate":"2026-10-06 09:18:07","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98214","Ordinal":"1","Title":"selinux: recheck intermediate backing files on mprotect()","CVE":"CVE-2026-98214","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98214","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nselinux: recheck intermediate backing files on mprotect()\n\nmprotect() can be used to bypass the SELinux checks that mmap() performs\nagainst the intermediate layers of a stacked filesystem.\n\nmmap() checks every backing layer as the request descends through the\nstack.  mprotect() only has the lowest backing file in vma->vm_file, so it\nrechecks the top-level user and the lowest mounter, but skips the mounters\nof every layer in between.  With two nested overlayfs mounts and a policy\ndenying mounter_t -> middle_file_t:file { execute }, a direct\nmmap(PROT_EXEC) is denied:\n\n  avc:  denied  { execute } for  pid=71 comm=\"nested_exec\"\n    path=\"/payload\" dev=\"overlay\" ino=9\n    scontext=user_u:base_r:mounter_t\n    tcontext=user_u:object_r:middle_file_t tclass=file permissive=0\n\nwhile mmap(PROT_NONE) followed by mprotect(PROT_EXEC) succeeds.\n\nPreserve each intermediate path, mounter SID and file-description SID in\nthe backing-file security blob, copying the saved entries when another\nbacking layer is opened.  Allocate the array only for nested backing files,\nand release it and the path references in the backing_file_free hook.\n\nDuring mprotect(), recheck fd { use } and the requested inode permissions\nfor every saved mounter, and include the intermediate layers in the execmod\nchecks.  Policy for nested stacking may then need to grant intermediate\nmounters what a direct mmap() already requires, and execmod on intermediate\nlabels for binaries using text relocations.\n\nTested on arm64 QEMU with a small BusyBox initramfs and a purpose-built\nSELinux policy, on a mainline tree containing\ncommit f2381b546e7e (\"fs: fix user path of nested backing files\").\n\n[PM: subject tweak]","Type":"Description","Title":"selinux: recheck intermediate backing files on mprotect()"}]}}}