smb: client: fix double-free in SMB2_flush() replay
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.
CVE-2026-64383
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-2026-64383
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": "433042a91f9373241307725b52de573933ffedbf",
"lessThan": "6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb",
"versionType": "git"
},
{
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"lessThan": "878757163eea684750107a31ea134c103863515d",
"versionType": "git"
},
{
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"lessThan": "3407240cde132a4b72d6429a2625a09a2f78adaf",
"versionType": "git"
},
{
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"lessThan": "013a9a3da46c5dabcf18f65ea6a47874ba12a15d",
"versionType": "git"
},
{
"status": "affected",
"version": "4f1fffa2376922f3d1d506e49c0fd445b023a28e",
"lessThan": "4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.32",
"lessThan": "6.6.145",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/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": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/smb2pdu.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64383
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #41024 · Revision 1
- Added to Heist Feed
- Publisher date