ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
In the Linux kernel, the following vulnerability has been resolved: ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len() After this commit (e2b76ab8b5c9 "ksmbd: add support for read compound"), response buffer management was changed to use dynamic iov array. In the new design, smb2_calc_max_out_buf_len() expects the second argument (hdr2_len) to be the offset of ->Buffer field in the response structure, not a hardcoded magic number. Fix the remaining call sites to use the correct offsetof() value.
CVE-2026-31478
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31478
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f2283680a80571ca82d710bc6ecd8f8beac67d63",
"lessThan": "70b4c414889492c522b6e4331562360f49be2361",
"versionType": "git"
},
{
"status": "affected",
"version": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77",
"lessThan": "9a7166f0ef8cbb7bb48dd05e2471d995566003f5",
"versionType": "git"
},
{
"status": "affected",
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
"lessThan": "c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683",
"versionType": "git"
},
{
"status": "affected",
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
"lessThan": "6aef1765d6807e0f027cd87f6ac973eb0879a46d",
"versionType": "git"
},
{
"status": "affected",
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
"lessThan": "80824c7e527b70cf9039534e60aff592e8f209d1",
"versionType": "git"
},
{
"status": "affected",
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
"lessThan": "4cb537ae4f37d7d0f617815ed4bed7173fb50861",
"versionType": "git"
},
{
"status": "affected",
"version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d",
"lessThan": "0e55f63dd08f09651d39e1b709a91705a8a0ddcb",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.145",
"lessThan": "5.15.203",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.71",
"lessThan": "6.1.168",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/server/smb2pdu.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/server/smb2pdu.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31478
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #39905 · Revision 1
- Added to Heist Feed
- Publisher date