{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31432","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.089Z","datePublished":"2026-04-22T08:15:10.873Z","dateUpdated":"2026-05-11T22:08:35.779Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:08:35.779Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix OOB write in QUERY_INFO for compound requests\n\nWhen a compound request such as READ + QUERY_INFO(Security) is received,\nand the first command (READ) consumes most of the response buffer,\nksmbd could write beyond the allocated buffer while building a security\ndescriptor.\n\nThe root cause was that smb2_get_info_sec() checked buffer space using\nppntsd_size from xattr, while build_sec_desc() often synthesized a\nsignificantly larger descriptor from POSIX ACLs.\n\nThis patch introduces smb_acl_sec_desc_scratch_len() to accurately\ncompute the final descriptor size beforehand, performs proper buffer\nchecking with smb2_calc_max_out_buf_len(), and uses exact-sized\nallocation + iov pinning."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c","fs/smb/server/smbacl.c","fs/smb/server/smbacl.h"],"versions":[{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","lessThan":"d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09","status":"affected","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","lessThan":"075ea208c648cc2bcd616295b711d3637c61de45","status":"affected","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","lessThan":"515c2daab46021221bdf406bef19bc90a44ec617","status":"affected","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","lessThan":"fda9522ed6afaec45cabc198d8492270c394c7bc","status":"affected","versionType":"git"},{"version":"f2283680a80571ca82d710bc6ecd8f8beac67d63","status":"affected","versionType":"git"},{"version":"9f297df20d93411c0b4ddad7f88ba04a7cd36e77","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c","fs/smb/server/smbacl.c","fs/smb/server/smbacl.h"],"versions":[{"version":"6.6","status":"affected"},{"version":"0","lessThan":"6.6","status":"unaffected","versionType":"semver"},{"version":"6.12.81","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.22","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.12","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.71"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09"},{"url":"https://git.kernel.org/stable/c/075ea208c648cc2bcd616295b711d3637c61de45"},{"url":"https://git.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617"},{"url":"https://git.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc"}],"title":"ksmbd: fix OOB write in QUERY_INFO for compound requests","x_generator":{"engine":"bippy-1.2.0"}}}}