{"id":"CVE-2026-64381","state":"PUBLISHED","title":"smb: client: Fix next buffer leak in receive_encrypted_standard()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix next buffer leak in receive_encrypted_standard()\n\nreceive_encrypted_standard() allocates next_buffer before checking\nwhether the number of compound PDUs already reached MAX_COMPOUND. If\nthe limit check fails, the function returns immediately and the newly\nallocated next_buffer is not assigned to server->smallbuf/server->bigbuf,\nmaking it leaked.\n\nMove the MAX_COMPOUND check before allocating next_buffer.","publishedAt":"2026-07-25T08:50:31.209Z","updatedAt":"2026-08-17T04:54:32.853Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"94e4f672db029414b9888b5137a7559f1febf2d8","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"68fc0b6cc03ca58060c0f36454e169f5fe258974","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"07e0ab81df1790afa35732a4e8e07ff831b29008","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"9136a08dc29328edd9867f2545e73906ac9df93b","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"67097772df7791c53d608f04bd31c676ccf79b83","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"297243e365fc9fe2f8e9b7dd535a65d922cd108b","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"927d4805aea0a287d36dd4f826ee24d69a2afee3","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"1c6267a1d5cf4c73b656f8181b310cbbb3e4767b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","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":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","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":["fs/smb/client/smb2ops.c"]}],"references":["https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8","https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974","https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008","https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b","https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83","https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b","https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3","https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64381.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64381","state":"PUBLISHED","datePublished":"2026-07-25T08:50:31.209Z","dateUpdated":"2026-08-17T04:54:32.853Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.784Z"},"containers":{"cna":{"title":"smb: client: Fix next buffer leak in receive_encrypted_standard()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix next buffer leak in receive_encrypted_standard()\n\nreceive_encrypted_standard() allocates next_buffer before checking\nwhether the number of compound PDUs already reached MAX_COMPOUND. If\nthe limit check fails, the function returns immediately and the newly\nallocated next_buffer is not assigned to server->smallbuf/server->bigbuf,\nmaking it leaked.\n\nMove the MAX_COMPOUND check before allocating next_buffer."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"94e4f672db029414b9888b5137a7559f1febf2d8","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"68fc0b6cc03ca58060c0f36454e169f5fe258974","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"07e0ab81df1790afa35732a4e8e07ff831b29008","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"9136a08dc29328edd9867f2545e73906ac9df93b","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"67097772df7791c53d608f04bd31c676ccf79b83","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"297243e365fc9fe2f8e9b7dd535a65d922cd108b","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"927d4805aea0a287d36dd4f826ee24d69a2afee3","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"1c6267a1d5cf4c73b656f8181b310cbbb3e4767b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","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":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","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":["fs/smb/client/smb2ops.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8"},{"url":"https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974"},{"url":"https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008"},{"url":"https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b"},{"url":"https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83"},{"url":"https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b"},{"url":"https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3"},{"url":"https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:54:32.853Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}