{"id":"CVE-2026-90327","state":"PUBLISHED","title":"phonet: pep: do not write beyond optlen in getsockopt","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nphonet: pep: do not write beyond optlen in getsockopt\n\npep_getsockopt() clamps the reported length to the caller's buffer with\nmin_t(), but then stores the value with put_user(val, (int __user *)\noptval), which always writes sizeof(int) bytes. A getsockopt() call with\nan optlen smaller than sizeof(int) thus reports the clamped length yet\nwrites a full int, one to three bytes past the user buffer.\n\nWrite the value with copy_to_user() bounded by len, so at most optlen\nbytes are copied, matching the length reported back to userspace.","publishedAt":"2026-09-17T16:08:42.017Z","updatedAt":"2026-10-19T09:01:44.321Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"6054fed6bad08b6d03973e8ffca7f0c9394d1c30","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"eac733a0b6fe0a52d91f9f623425735ed50ac6c2","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"95e0ed2439dd1792eb454c68ae8d10f30ffe3bff","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"056eea1a2068ad2fb7c3093c5f1095268f87d0c7","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"1bf499e438da80455e258049bce60ffb3a53f3fa","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"c4487e4d5309de587479ecc2f5173b49586f46f4","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"f97022fefe6eb06ee18549d603420440f2959802","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"77e5eb0e192aec6710c03ca8144582fd2af36ca4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/phonet/pep.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.28","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.28","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/phonet/pep.c"]}],"references":["https://git.kernel.org/stable/c/6054fed6bad08b6d03973e8ffca7f0c9394d1c30","https://git.kernel.org/stable/c/eac733a0b6fe0a52d91f9f623425735ed50ac6c2","https://git.kernel.org/stable/c/95e0ed2439dd1792eb454c68ae8d10f30ffe3bff","https://git.kernel.org/stable/c/056eea1a2068ad2fb7c3093c5f1095268f87d0c7","https://git.kernel.org/stable/c/1bf499e438da80455e258049bce60ffb3a53f3fa","https://git.kernel.org/stable/c/c4487e4d5309de587479ecc2f5173b49586f46f4","https://git.kernel.org/stable/c/f97022fefe6eb06ee18549d603420440f2959802","https://git.kernel.org/stable/c/77e5eb0e192aec6710c03ca8144582fd2af36ca4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90327.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90327","state":"PUBLISHED","datePublished":"2026-09-17T16:08:42.017Z","dateUpdated":"2026-10-19T09:01:44.321Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.802Z"},"containers":{"cna":{"title":"phonet: pep: do not write beyond optlen in getsockopt","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nphonet: pep: do not write beyond optlen in getsockopt\n\npep_getsockopt() clamps the reported length to the caller's buffer with\nmin_t(), but then stores the value with put_user(val, (int __user *)\noptval), which always writes sizeof(int) bytes. A getsockopt() call with\nan optlen smaller than sizeof(int) thus reports the clamped length yet\nwrites a full int, one to three bytes past the user buffer.\n\nWrite the value with copy_to_user() bounded by len, so at most optlen\nbytes are copied, matching the length reported back to userspace."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"6054fed6bad08b6d03973e8ffca7f0c9394d1c30","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"eac733a0b6fe0a52d91f9f623425735ed50ac6c2","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"95e0ed2439dd1792eb454c68ae8d10f30ffe3bff","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"056eea1a2068ad2fb7c3093c5f1095268f87d0c7","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"1bf499e438da80455e258049bce60ffb3a53f3fa","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"c4487e4d5309de587479ecc2f5173b49586f46f4","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"f97022fefe6eb06ee18549d603420440f2959802","versionType":"git"},{"version":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a","status":"affected","lessThan":"77e5eb0e192aec6710c03ca8144582fd2af36ca4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/phonet/pep.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.28","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.28","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/phonet/pep.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6054fed6bad08b6d03973e8ffca7f0c9394d1c30"},{"url":"https://git.kernel.org/stable/c/eac733a0b6fe0a52d91f9f623425735ed50ac6c2"},{"url":"https://git.kernel.org/stable/c/95e0ed2439dd1792eb454c68ae8d10f30ffe3bff"},{"url":"https://git.kernel.org/stable/c/056eea1a2068ad2fb7c3093c5f1095268f87d0c7"},{"url":"https://git.kernel.org/stable/c/1bf499e438da80455e258049bce60ffb3a53f3fa"},{"url":"https://git.kernel.org/stable/c/c4487e4d5309de587479ecc2f5173b49586f46f4"},{"url":"https://git.kernel.org/stable/c/f97022fefe6eb06ee18549d603420440f2959802"},{"url":"https://git.kernel.org/stable/c/77e5eb0e192aec6710c03ca8144582fd2af36ca4"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:01:44.321Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.28","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}