{"api_version":"1","generated_at":"2026-09-25T11:47:53+00:00","cve":"CVE-2026-93206","urls":{"html":"https://cve.report/CVE-2026-93206","api":"https://cve.report/api/cve/CVE-2026-93206.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93206","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93206"},"summary":{"title":"PCI/proc: Use file_ns_capable() when checking config space read access","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/proc: Use file_ns_capable() when checking config space read access\n\nproc_bus_pci_read() decides how much of the config space is readable based\non capable(CAP_SYS_ADMIN), which checks the credentials of the task calling\nread(), not the credentials of the process that opened the file.\n\nThe sysfs equivalent, pci_read_config(), has checked the credentials of the\nopening process since commit de139a339395 (\"pci: check caps from sysfs file\nopen to read device dependent config space\"), so a privileged process can\nopen the config space file and pass the file descriptor to an unprivileged\nprocess (for example, a process running a KVM guest with an assigned\ndevice), which can then read the entire config space.  The check was\nsubsequently routed through the LSM framework in commit 47970b1b2aa6 (\"pci:\nuse security_capable() when checking capablities during config space read\")\nand converted to the dedicated helper in commit ab0fa82b2df9 (\"pci-sysfs:\nuse proper file capability helper function\").\n\nThus, the two interfaces check the same capability against different\ncredentials.  Checking the credentials of the task calling read() makes the\noutcome depend on who reads rather than who opened, so the restriction is\nbypassed whenever a more privileged process reads through the descriptor.\nChecking the credentials recorded in file->f_cred settles the decision at\nopen() time and ties it to the file, where it cannot change with the\ncaller.\n\nUse file_ns_capable() to check CAP_SYS_ADMIN against the credentials in\neffect when the file was opened, bringing the procfs interface in line with\nthe sysfs behaviour.\n\nAs a result, a file descriptor opened by a privileged process and passed to\nan unprivileged one now allows the entire config space to be read through\nprocfs, matching sysfs.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 16:17:14","updated_at":"2026-09-24 16:17:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8a3a54aa3e65ed76f8560a387243a7738ae0cb1c","name":"https://git.kernel.org/stable/c/8a3a54aa3e65ed76f8560a387243a7738ae0cb1c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/53407535d49ec034e476121020b5c878f0d92e18","name":"https://git.kernel.org/stable/c/53407535d49ec034e476121020b5c878f0d92e18","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6351e94076329dab517ea94c115e15c4d8459381","name":"https://git.kernel.org/stable/c/6351e94076329dab517ea94c115e15c4d8459381","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f82f53e75eff382fc8f56b73279b54f7cf5a5c65","name":"https://git.kernel.org/stable/c/f82f53e75eff382fc8f56b73279b54f7cf5a5c65","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e7730acd6a01c5931a3afb83639810ff2fb9cc92","name":"https://git.kernel.org/stable/c/e7730acd6a01c5931a3afb83639810ff2fb9cc92","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5c7ab4ca66f0880cffc3735555ea719dd5253726","name":"https://git.kernel.org/stable/c/5c7ab4ca66f0880cffc3735555ea719dd5253726","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c2d4174f492458ecdcdef309243624999612d526","name":"https://git.kernel.org/stable/c/c2d4174f492458ecdcdef309243624999612d526","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/77272b7fd0e472086fd626a1fcd11da625822cc2","name":"https://git.kernel.org/stable/c/77272b7fd0e472086fd626a1fcd11da625822cc2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93206","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93206","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 8a3a54aa3e65ed76f8560a387243a7738ae0cb1c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 5c7ab4ca66f0880cffc3735555ea719dd5253726 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 53407535d49ec034e476121020b5c878f0d92e18 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 e7730acd6a01c5931a3afb83639810ff2fb9cc92 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.157 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.109 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.50 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.2.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/pci/proc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8a3a54aa3e65ed76f8560a387243a7738ae0cb1c","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"5c7ab4ca66f0880cffc3735555ea719dd5253726","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"53407535d49ec034e476121020b5c878f0d92e18","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"e7730acd6a01c5931a3afb83639810ff2fb9cc92","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"77272b7fd0e472086fd626a1fcd11da625822cc2","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"c2d4174f492458ecdcdef309243624999612d526","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"6351e94076329dab517ea94c115e15c4d8459381","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"f82f53e75eff382fc8f56b73279b54f7cf5a5c65","status":"affected","version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","versionType":"git"},{"lessThan":"5.10.270","status":"affected","version":"0","versionType":"semver"},{"lessThan":"5.15.221","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.1.188","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.6.157","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.12.109","status":"affected","version":"0","versionType":"semver"},{"lessThan":"6.18.50","status":"affected","version":"0","versionType":"semver"},{"lessThan":"7.2.4","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/pci/proc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/proc: Use file_ns_capable() when checking config space read access\n\nproc_bus_pci_read() decides how much of the config space is readable based\non capable(CAP_SYS_ADMIN), which checks the credentials of the task calling\nread(), not the credentials of the process that opened the file.\n\nThe sysfs equivalent, pci_read_config(), has checked the credentials of the\nopening process since commit de139a339395 (\"pci: check caps from sysfs file\nopen to read device dependent config space\"), so a privileged process can\nopen the config space file and pass the file descriptor to an unprivileged\nprocess (for example, a process running a KVM guest with an assigned\ndevice), which can then read the entire config space.  The check was\nsubsequently routed through the LSM framework in commit 47970b1b2aa6 (\"pci:\nuse security_capable() when checking capablities during config space read\")\nand converted to the dedicated helper in commit ab0fa82b2df9 (\"pci-sysfs:\nuse proper file capability helper function\").\n\nThus, the two interfaces check the same capability against different\ncredentials.  Checking the credentials of the task calling read() makes the\noutcome depend on who reads rather than who opened, so the restriction is\nbypassed whenever a more privileged process reads through the descriptor.\nChecking the credentials recorded in file->f_cred settles the decision at\nopen() time and ties it to the file, where it cannot change with the\ncaller.\n\nUse file_ns_capable() to check CAP_SYS_ADMIN against the credentials in\neffect when the file was opened, bringing the procfs interface in line with\nthe sysfs behaviour.\n\nAs a result, a file descriptor opened by a privileged process and passed to\nan unprivileged one now allows the entire config space to be read through\nprocfs, matching sysfs."}],"providerMetadata":{"dateUpdated":"2026-09-24T15:10:29.326Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8a3a54aa3e65ed76f8560a387243a7738ae0cb1c"},{"url":"https://git.kernel.org/stable/c/5c7ab4ca66f0880cffc3735555ea719dd5253726"},{"url":"https://git.kernel.org/stable/c/53407535d49ec034e476121020b5c878f0d92e18"},{"url":"https://git.kernel.org/stable/c/e7730acd6a01c5931a3afb83639810ff2fb9cc92"},{"url":"https://git.kernel.org/stable/c/77272b7fd0e472086fd626a1fcd11da625822cc2"},{"url":"https://git.kernel.org/stable/c/c2d4174f492458ecdcdef309243624999612d526"},{"url":"https://git.kernel.org/stable/c/6351e94076329dab517ea94c115e15c4d8459381"},{"url":"https://git.kernel.org/stable/c/f82f53e75eff382fc8f56b73279b54f7cf5a5c65"}],"title":"PCI/proc: Use file_ns_capable() when checking config space read access","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93206","datePublished":"2026-09-24T15:10:29.326Z","dateReserved":"2026-09-17T16:02:15.093Z","dateUpdated":"2026-09-24T15:10:29.326Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 16:17:14","lastModifiedDate":"2026-09-24 16:17:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93206","Ordinal":"1","Title":"PCI/proc: Use file_ns_capable() when checking config space read ","CVE":"CVE-2026-93206","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93206","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/proc: Use file_ns_capable() when checking config space read access\n\nproc_bus_pci_read() decides how much of the config space is readable based\non capable(CAP_SYS_ADMIN), which checks the credentials of the task calling\nread(), not the credentials of the process that opened the file.\n\nThe sysfs equivalent, pci_read_config(), has checked the credentials of the\nopening process since commit de139a339395 (\"pci: check caps from sysfs file\nopen to read device dependent config space\"), so a privileged process can\nopen the config space file and pass the file descriptor to an unprivileged\nprocess (for example, a process running a KVM guest with an assigned\ndevice), which can then read the entire config space.  The check was\nsubsequently routed through the LSM framework in commit 47970b1b2aa6 (\"pci:\nuse security_capable() when checking capablities during config space read\")\nand converted to the dedicated helper in commit ab0fa82b2df9 (\"pci-sysfs:\nuse proper file capability helper function\").\n\nThus, the two interfaces check the same capability against different\ncredentials.  Checking the credentials of the task calling read() makes the\noutcome depend on who reads rather than who opened, so the restriction is\nbypassed whenever a more privileged process reads through the descriptor.\nChecking the credentials recorded in file->f_cred settles the decision at\nopen() time and ties it to the file, where it cannot change with the\ncaller.\n\nUse file_ns_capable() to check CAP_SYS_ADMIN against the credentials in\neffect when the file was opened, bringing the procfs interface in line with\nthe sysfs behaviour.\n\nAs a result, a file descriptor opened by a privileged process and passed to\nan unprivileged one now allows the entire config space to be read through\nprocfs, matching sysfs.","Type":"Description","Title":"PCI/proc: Use file_ns_capable() when checking config space read "}]}}}