{"id":"CVE-2026-74399","state":"PUBLISHED","title":"evm: terminate and bound the evm_xattrs read buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nevm: terminate and bound the evm_xattrs read buffer\n\nevm_read_xattrs() allocates size + 1 bytes, fills them from the list of\nenabled xattrs, and then passes strlen(temp) to\nsimple_read_from_buffer(). When no configured xattrs are enabled, the\nfill loop stores nothing and temp[0] remains uninitialized, so strlen()\nreads beyond initialized memory.\n\nExplicitly terminate the buffer after allocation, use snprintf() for\neach formatted line, and pass the accumulated length, without risk of\ntruncation, to simple_read_from_buffer().","publishedAt":"2026-08-15T05:59:10.791Z","updatedAt":"2026-08-17T05:18:39.008Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"8df81954d22a653a8b01d46692cd56f71137269b","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"0b9f8282b40af4a99d6243d2cb939d14ff36b049","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"a36cbfb85f26e6c6fb6529b1a364331b94dc88f3","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"12ad52dc45a0c8c9d25e85b4a84201de4c5420ed","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"38b7d63b23aa9d2ddde7688040e9426d32be4065","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"11143a19f5b8dc8f414deab87571134f9f447313","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/integrity/evm/evm_secfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.18","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/integrity/evm/evm_secfs.c"]}],"references":["https://git.kernel.org/stable/c/8df81954d22a653a8b01d46692cd56f71137269b","https://git.kernel.org/stable/c/0b9f8282b40af4a99d6243d2cb939d14ff36b049","https://git.kernel.org/stable/c/a36cbfb85f26e6c6fb6529b1a364331b94dc88f3","https://git.kernel.org/stable/c/12ad52dc45a0c8c9d25e85b4a84201de4c5420ed","https://git.kernel.org/stable/c/a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d","https://git.kernel.org/stable/c/38b7d63b23aa9d2ddde7688040e9426d32be4065","https://git.kernel.org/stable/c/11143a19f5b8dc8f414deab87571134f9f447313"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74399.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74399","state":"PUBLISHED","datePublished":"2026-08-15T05:59:10.791Z","dateUpdated":"2026-08-17T05:18:39.008Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.891Z"},"containers":{"cna":{"title":"evm: terminate and bound the evm_xattrs read buffer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nevm: terminate and bound the evm_xattrs read buffer\n\nevm_read_xattrs() allocates size + 1 bytes, fills them from the list of\nenabled xattrs, and then passes strlen(temp) to\nsimple_read_from_buffer(). When no configured xattrs are enabled, the\nfill loop stores nothing and temp[0] remains uninitialized, so strlen()\nreads beyond initialized memory.\n\nExplicitly terminate the buffer after allocation, use snprintf() for\neach formatted line, and pass the accumulated length, without risk of\ntruncation, to simple_read_from_buffer()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"8df81954d22a653a8b01d46692cd56f71137269b","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"0b9f8282b40af4a99d6243d2cb939d14ff36b049","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"a36cbfb85f26e6c6fb6529b1a364331b94dc88f3","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"12ad52dc45a0c8c9d25e85b4a84201de4c5420ed","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"38b7d63b23aa9d2ddde7688040e9426d32be4065","versionType":"git"},{"version":"fa516b66a1bfce1d72f1620c54bdfebc493000d1","status":"affected","lessThan":"11143a19f5b8dc8f414deab87571134f9f447313","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/integrity/evm/evm_secfs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.18","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/integrity/evm/evm_secfs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8df81954d22a653a8b01d46692cd56f71137269b"},{"url":"https://git.kernel.org/stable/c/0b9f8282b40af4a99d6243d2cb939d14ff36b049"},{"url":"https://git.kernel.org/stable/c/a36cbfb85f26e6c6fb6529b1a364331b94dc88f3"},{"url":"https://git.kernel.org/stable/c/12ad52dc45a0c8c9d25e85b4a84201de4c5420ed"},{"url":"https://git.kernel.org/stable/c/a0f64cf8bfcb39e533d9e27aeb763a8d81b7f39d"},{"url":"https://git.kernel.org/stable/c/38b7d63b23aa9d2ddde7688040e9426d32be4065"},{"url":"https://git.kernel.org/stable/c/11143a19f5b8dc8f414deab87571134f9f447313"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:18:39.008Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}