CVE-2026-93210

smb: client: harden DFS cache against invalid target hints

Published Sep 24, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

In the Linux kernel, the following vulnerability has been resolved:

smb: client: harden DFS cache against invalid target hints

Currently, get_tgt_name() returns ERR_PTR(-ENOENT) when ce->tgthint is
NULL, and dfs_cache_noreq_update_tgthint() assumes ce->tgthint is always
valid.

In preparation for clearing ce->tgthint in free_tgts(), harden callers
of get_tgt_name() against ERR_PTR results and harden
dfs_cache_noreq_update_tgthint() against NULL pointer dereferences.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`54be1f6c1c37498bba557049df646cc239fa37e3`	affected	< a48328afbc3f63e3b9de8827e2e16c15b17976f7
`54be1f6c1c37498bba557049df646cc239fa37e3`	affected	< 6cb7f9fed8f40f28fbd464ca99c946951afc0952
`54be1f6c1c37498bba557049df646cc239fa37e3`	affected	< 66dbcdbb0cadffd12eb8f2b115fd57d384c5109d
`54be1f6c1c37498bba557049df646cc239fa37e3`	affected	< 846f0709559b9e27024e126a80bc7afb76516912
`54be1f6c1c37498bba557049df646cc239fa37e3`	affected	< 7e32da6047d9afdae8dd17b87b4c8d97363c4ee2
`54be1f6c1c37498bba557049df646cc239fa37e3`	affected	< bf86c08123c6ab8c61cc0be1dad7540db93738ff

Linux

affected

Version	Status	Constraints
`5.0`	affected	—
`0`	unaffected	< 5.0
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.109`	unaffected	≤ 6.12.*
`6.18.50`	unaffected	≤ 6.18.*
`7.2.4`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,a48328afbc3f63e3b9de8827e2e16c15b17976f7)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6cb7f9fed8f40f28fbd464ca99c946951afc0952)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,66dbcdbb0cadffd12eb8f2b115fd57d384c5109d)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,846f0709559b9e27024e126a80bc7afb76516912)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7e32da6047d9afdae8dd17b87b4c8d97363c4ee2)`	affected	code_commit	—
`[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,bf86c08123c6ab8c61cc0be1dad7540db93738ff)`	affected	code_commit	—
`[0,6.1.188)`	affected	semver	—
`[0,6.6.157)`	affected	semver	—
`[0,6.12.109)`	affected	semver	—
`[0,6.18.50)`	affected	semver	—
`[0,7.2.4)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.109,6.13.0)`	unaffected	semver	—
`[6.18.50,6.19.0)`	unaffected	semver	—
`[7.2.4,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.173% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/66dbcdbb0cadffd12eb8f2b115fd57d384c5109d
https://git.kernel.org/stable/c/6cb7f9fed8f40f28fbd464ca99c946951afc0952
https://git.kernel.org/stable/c/7e32da6047d9afdae8dd17b87b4c8d97363c4ee2
https://git.kernel.org/stable/c/846f0709559b9e27024e126a80bc7afb76516912
https://git.kernel.org/stable/c/a48328afbc3f63e3b9de8827e2e16c15b17976f7
https://git.kernel.org/stable/c/bf86c08123c6ab8c61cc0be1dad7540db93738ff

History

Sep 26, 2026 1:30 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-476

Sep 24, 2026 3:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: smb: client: harden DFS cache against invalid target hints Currently, get_tgt_name() returns ERR_PTR(-ENOENT) when ce->tgthint is NULL, and dfs_cache_noreq_update_tgthint() assumes ce->tgthint is always valid. In preparation for clearing ce->tgthint in free_tgts(), harden callers of get_tgt_name() against ERR_PTR results and harden dfs_cache_noreq_update_tgthint() against NULL pointer dereferences.
Title		smb: client: harden DFS cache against invalid target hints
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/66dbcdbb0cadffd12eb8f2b115fd57d384c5109d https://git.kernel.org/stable/c/6cb7f9fed8f40f28fbd464ca99c946951afc0952 https://git.kernel.org/stable/c/7e32da6047d9afdae8dd17b87b4c8d97363c4ee2 https://git.kernel.org/stable/c/846f0709559b9e27024e126a80bc7afb76516912 https://git.kernel.org/stable/c/a48328afbc3f63e3b9de8827e2e16c15b17976f7 https://git.kernel.org/stable/c/bf86c08123c6ab8c61cc0be1dad7540db93738ff