smb: client: pin DFS superblock in iterator callback
In the Linux kernel, the following vulnerability has been resolved: smb: client: pin DFS superblock in iterator callback tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() takes its active reference only after iterate_supers_type() has dropped s_umount and its passive reference. Concurrent DFS automount expiry can therefore free the superblock before cifs_sb_active() uses it. A deterministic KASAN test reproduces the race as: BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80 The same test passes with this change applied. Take the active reference in the callback while iterate_supers_type() still holds s_umount shared. cifs_put_tcp_super() remains the matching release.
CVE-2026-97562
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-2026-97562
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": "bacd704a95ad0b93af995aae4a523aa046f46563",
"lessThan": "3c9acc9835c304013a4faeb969fe9333d66ca9f8",
"versionType": "git"
},
{
"status": "affected",
"version": "bacd704a95ad0b93af995aae4a523aa046f46563",
"lessThan": "ea43a15cea36dc5ddd832be5bddeac7dd804cbcf",
"versionType": "git"
},
{
"status": "affected",
"version": "bacd704a95ad0b93af995aae4a523aa046f46563",
"lessThan": "a6b6561522212af852c9ad8a7dca8d59ef2c7377",
"versionType": "git"
},
{
"status": "affected",
"version": "bacd704a95ad0b93af995aae4a523aa046f46563",
"lessThan": "5b01a8c0209690db75341528ec53fd87e0ac1460",
"versionType": "git"
},
{
"status": "affected",
"version": "bacd704a95ad0b93af995aae4a523aa046f46563",
"lessThan": "d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/misc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/misc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97562
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38008 · Revision 1
- Added to Heist Feed
- Publisher date