221 lines
11 KiB
JSON
221 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98214",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.325Z",
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"datePublished": "2026-10-06T08:44:50.209Z",
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"dateUpdated": "2026-10-19T09:15:45.082Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:15:45.082Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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]"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/selinux/hooks.c",
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"security/selinux/include/objsec.h"
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],
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"versions": [
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{
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"version": "bc6c380c1159de52a252ed11f19a42c47f60a735",
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"lessThan": "4d50ebe5a27724e020747ffd61a051dec67cb8ec",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8bacd09f12c27710228562e4d13163e58c5f4a45",
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"lessThan": "89376fbfdcc1a728e1775f98752cdd90b0930a00",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d844702198395d3f80222777030f69db6be6b709",
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"lessThan": "d127c7e1f3e1231d8ac8b2738e3f00bea12afe74",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "82544d36b1729153c8aeb179e84750f0c085d3b1",
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"lessThan": "c2bbb905af2293549651b614a52ad91e0b462b60",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "82544d36b1729153c8aeb179e84750f0c085d3b1",
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"lessThan": "78fc54b934bfb2c18aad8154c7302067146946f9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "cd0e707a927a70cdfd8bc5a512a9719a87f5ed51",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.6.144",
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"lessThan": "6.6.158",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.95",
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"lessThan": "6.12.112",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.18.38",
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"lessThan": "6.18.54",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "7.0.4",
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"lessThan": "7.1",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/selinux/hooks.c",
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"security/selinux/include/objsec.h"
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],
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"versions": [
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{
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"version": "7.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.112",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.54",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.144",
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"versionEndExcluding": "6.6.158"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.12.95",
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"versionEndExcluding": "6.12.112"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18.38",
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"versionEndExcluding": "6.18.54"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.2.8"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.3"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0.4"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4d50ebe5a27724e020747ffd61a051dec67cb8ec"
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},
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{
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"url": "https://git.kernel.org/stable/c/89376fbfdcc1a728e1775f98752cdd90b0930a00"
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},
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{
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"url": "https://git.kernel.org/stable/c/d127c7e1f3e1231d8ac8b2738e3f00bea12afe74"
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},
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{
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"url": "https://git.kernel.org/stable/c/c2bbb905af2293549651b614a52ad91e0b462b60"
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},
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{
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"url": "https://git.kernel.org/stable/c/78fc54b934bfb2c18aad8154c7302067146946f9"
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}
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],
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"title": "selinux: recheck intermediate backing files on mprotect()",
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"x_generator": {
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} |