smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to change cifs_tcp_ses_lock for tc_lock around tc_count changes. There was missing lock around tc_count increment inside smb2_find_smb_sess_tcon_unlocked().
- Published
- Jul 19, 2026
- Updated
- Aug 13, 2026
- EPSS
- 0.5% · 40th percentile
- CWE
- —
Sign in to follow · You’ll be notified if a followed record enters KEV, gets an exploit or is updated.
Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel6.6.128 and later · before 6.6.142
- linux linux kernel6.12.75 and later · before 6.12.92
- linux linux kernel6.18.16 and later · before 6.18.34
- linux linux kernel6.19.6 and later · before 7.0.11
- linux linux kernel7.1
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 8c59eeeeffa1524ef57e173a89a1a3ff539888d5, 7.0affected
- 953953abb66e52c224057ab91e404284fefeab62 and later · before 7df1df6f40c0720d30206aa35c0343b962350e0daffected · git
- 601dd3b79769b38d30b693c40afdb2a4b7edf9d0 and later · before 13fb413ae22a37c69341918a6d651d19a9b0b9b7affected · git
- 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 and later · before bf4ebdb19ff9b3cdf992b50715fe61633327416aaffected · git
- 96c4af418586ee9a6aab61738644366426e05316 and later · before e374f4e496fef8168784f93a4477d67be34485fdaffected · git
- 96c4af418586ee9a6aab61738644366426e05316 and later · before 4d8690dace005a38e6dbde9ecce2da3ad85c7c41affected · git
- 6.6.128 and later · before 6.6.142affected · semver
- 6.12.75 and later · before 6.12.92affected · semver
- 6.18.16 and later · before 6.18.34affected · semver
- 6.19.6 and later · before 6.20affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:9 | kernel | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-devel | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-devel-matched | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules-extra | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-devel | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-devel-matched | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules-extra | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-abi-stablelists | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-cross-headers | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-debug | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-debug-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-debug-devel | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-debug-devel-matched | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-debug-modules | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
| AlmaLinux:9 | kernel-debug-modules-core | before 5.14.0-687.45.1.el9_8 | 5.14.0-687.45.1.el9_8 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 13fb413ae22a37c69341918a6d651d19a9b0b9b7 | Vendor (CNA) |
| Linux Linux | 4d8690dace005a38e6dbde9ecce2da3ad85c7c41 | Vendor (CNA) |
| Linux Linux | 6.12.92 | Vendor (CNA) |
| Linux Linux | 6.18.34 | Vendor (CNA) |
| Linux Linux | 6.20 | Vendor (CNA) |
| Linux Linux | 6.6.142 | Vendor (CNA) |
| Linux Linux | 7df1df6f40c0720d30206aa35c0343b962350e0d | Vendor (CNA) |
| Linux Linux | bf4ebdb19ff9b3cdf992b50715fe61633327416a | Vendor (CNA) |
| Linux Linux | e374f4e496fef8168784f93a4477d67be34485fd | Vendor (CNA) |
| almalinux:kernel | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.45.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.12.94-1 · Debian:13 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:6.12.0-211.50.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
+5
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7
- git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41
- git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d
- git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a
- git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd
Vendor advisories and official records. Exploit/PoC links are deliberately left out.