ksmbd: fix use-after-free of share_conf in compound request
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free of share_conf in compound request smb2_get_ksmbd_tcon() reuses work->tcon in compound requests without validating tcon->t_state. ksmbd_tree_conn_lookup() checks t_state == TREE_CONNECTED on the initial lookup path, but the compound reuse path bypasses this check entirely. If a prior command in the compound (SMB2_TREE_DISCONNECT) sets t_state to TREE_DISCONNECTED and frees share_conf via ksmbd_share_config_put(), subsequent commands dereference the freed share_conf through work->tcon->share_conf. KASAN report: [ 4.144653] ================================================================== [ 4.145059] BUG: KASAN: slab-use-after-free in smb2_write+0xc74/0xe70 [ 4.145415] Read of size 4 at addr ffff88810430c194 by task kworker/1:1/44 [ 4.145772] [ 4.145867] CPU: 1 UID: 0 PID: 44 Comm: kworker/1:1 Not tainted 7.0.0-rc3+ #60 PREEMPTLAZY [ 4.145871] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 4.145875] Workqueue: ksmbd-io handle_ksmbd_work [ 4.145888] Call Trace: [ 4.145892] [ 4.145894] dump_stack_lvl+0x64/0x80 [ 4.145910] print_report+0xce/0x660 [ 4.145919] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 4.145928] ? smb2_write+0xc74/0xe70 [ 4.145931] kasan_report+0xce/0x100 [ 4.145934] ? smb2_write+0xc74/0xe70 [ 4.145937] smb2_write+0xc74/0xe70 [ 4.145939] ? __pfx_smb2_write+0x10/0x10 [ 4.145942] ? _raw_spin_unlock+0xe/0x3
CVE-2026-23428
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-2026-23428
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": "eb947403518ea3d93f6d89264bb1f5416bb0c7d0",
"lessThan": "d08417981155883068b7260d9500ca306a03edac",
"versionType": "git"
},
{
"status": "affected",
"version": "854156d12caa9d36de1cf5f084591c7686cc8a9d",
"lessThan": "eae0dc86f71e6f3294c0cd7ffc05039258d243af",
"versionType": "git"
},
{
"status": "affected",
"version": "5005bcb4219156f1bf7587b185080ec1da08518e",
"lessThan": "806f13752652216db0c309392b4db3e64eeed4f2",
"versionType": "git"
},
{
"status": "affected",
"version": "5005bcb4219156f1bf7587b185080ec1da08518e",
"lessThan": "c742b46a153d3ff95ff0825ab1950c87b9e14470",
"versionType": "git"
},
{
"status": "affected",
"version": "5005bcb4219156f1bf7587b185080ec1da08518e",
"lessThan": "7f7468fd2a7554cea91b7d430335a3dbf01dcc09",
"versionType": "git"
},
{
"status": "affected",
"version": "5005bcb4219156f1bf7587b185080ec1da08518e",
"lessThan": "a5929c2020ce54e1dcbd1078c0f30b8aaf73c105",
"versionType": "git"
},
{
"status": "affected",
"version": "5005bcb4219156f1bf7587b185080ec1da08518e",
"lessThan": "c33615f995aee80657b9fdfbc4ee7f49c2bd733d",
"versionType": "git"
},
{
"status": "affected",
"version": "d1066c1b3663401cd23c0d6e60cdae750ce00c0f",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.121",
"lessThan": "5.15.203",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.36",
"lessThan": "6.1.167",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.3.10",
"lessThan": "6.4",
"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": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.10",
"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-2026-23428
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #39848 · Revision 1
- Added to Heist Feed
- Publisher date