{"id":"CVE-2026-98728","state":"PUBLISHED","title":"tpm: fix off-by-four bounds check in tpm2_get_random()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: fix off-by-four bounds check in tpm2_get_random()\n\nWhen the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random()\nskips the 4-byte parameter size field before locating the random data,\nbut the bounds check still validates the response length against\nTPM_HEADER_SIZE.  A truncated response can pass the check and make\nmemcpy() read up to 4 bytes past the response end, so stale buffer\ncontents end up in the caller's random bytes.\n\nFix this by checking the response length against 'offset', which\nalready includes the skipped parameter size field.","publishedAt":"2026-10-18T15:47:05.722Z","updatedAt":"2026-10-19T09:24:38.853Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"be54101992c2c5218be0e0a87827ccc96e3089af","versionType":"git"},{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"e30a2406408d2df6d9cd48c2e59e913cf266a05a","versionType":"git"},{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"42bb6216b861e892512128219ff23010d656ba14","versionType":"git"},{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"9b522400bf5c082feb9a0037a053ea822a2c7e4d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/tpm/tpm2-cmd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","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":["drivers/char/tpm/tpm2-cmd.c"]}],"references":["https://git.kernel.org/stable/c/be54101992c2c5218be0e0a87827ccc96e3089af","https://git.kernel.org/stable/c/e30a2406408d2df6d9cd48c2e59e913cf266a05a","https://git.kernel.org/stable/c/42bb6216b861e892512128219ff23010d656ba14","https://git.kernel.org/stable/c/9b522400bf5c082feb9a0037a053ea822a2c7e4d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98728.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98728","state":"PUBLISHED","datePublished":"2026-10-18T15:47:05.722Z","dateUpdated":"2026-10-19T09:24:38.853Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.366Z"},"containers":{"cna":{"title":"tpm: fix off-by-four bounds check in tpm2_get_random()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: fix off-by-four bounds check in tpm2_get_random()\n\nWhen the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random()\nskips the 4-byte parameter size field before locating the random data,\nbut the bounds check still validates the response length against\nTPM_HEADER_SIZE.  A truncated response can pass the check and make\nmemcpy() read up to 4 bytes past the response end, so stale buffer\ncontents end up in the caller's random bytes.\n\nFix this by checking the response length against 'offset', which\nalready includes the skipped parameter size field."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"be54101992c2c5218be0e0a87827ccc96e3089af","versionType":"git"},{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"e30a2406408d2df6d9cd48c2e59e913cf266a05a","versionType":"git"},{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"42bb6216b861e892512128219ff23010d656ba14","versionType":"git"},{"version":"1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497","status":"affected","lessThan":"9b522400bf5c082feb9a0037a053ea822a2c7e4d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/tpm/tpm2-cmd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","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":["drivers/char/tpm/tpm2-cmd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/be54101992c2c5218be0e0a87827ccc96e3089af"},{"url":"https://git.kernel.org/stable/c/e30a2406408d2df6d9cd48c2e59e913cf266a05a"},{"url":"https://git.kernel.org/stable/c/42bb6216b861e892512128219ff23010d656ba14"},{"url":"https://git.kernel.org/stable/c/9b522400bf5c082feb9a0037a053ea822a2c7e4d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:24:38.853Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}