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CVE-2026-43378

30
FAUCET Score

In the Linux kernel, the following vulnerability has been resolved: smb: server: fix use-after-free in smb2_open() The opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is dereferenced after rcu_read_unlock(), creating a use-after-free window.

First published: May 8, 2026Last modified: May 20, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.15, < 6.1.167CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.2, < 6.6.130CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.7, < 6.12.78CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.13, < 6.18.19CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 6.19, < 6.19.9CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.31%
Probability of exploitation in next 30 days
EPSS Percentile
23.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0031 is in the 60th percentile among its peer group of 17,070 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (42)

ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde-6.8 (jammy)Fixed in: 6.8.0-1062.69~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde (noble)Fixed in: 6.8.0-1062.69
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.8 (jammy)Fixed in: 6.8.0-1063.71~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (noble)Fixed in: 6.8.0-1063.71
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fde-6.17 (noble)Fixed in: 6.17.0-1018.18~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.17 (noble)Fixed in: 6.17.0-1021.21~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.8 (jammy)Fixed in: 6.8.0-1063.69~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-6.8 (jammy)Fixed in: 6.8.0-1060.61~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.8 (jammy)Fixed in: 6.8.0-1057.58~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (noble)Fixed in: 6.8.0-1058.64
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (noble)Fixed in: 6.8.0-1045.48
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-lowlatency (noble)Fixed in: 6.8.0-1058.61.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.17 (noble)Fixed in: 6.17.0-1017.19~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (questing)Fixed in: 6.17.0-1017.19
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.17 (noble)Fixed in: 6.17.0-1019.19~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.17 (noble)Fixed in: 6.17.0-1020.22~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.17 (noble)Fixed in: 6.17.0-1018.18~24.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (questing)Fixed in: 6.17.0-40.40
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (questing)Fixed in: 6.17.0-1019.19
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (questing)Fixed in: 6.17.0-1020.22
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (questing)Fixed in: 6.17.0-1018.18
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-6.8 (jammy)Fixed in: 6.8.0-1058.61~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.8 (jammy)Fixed in: 6.8.1-1055.56~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (noble)Fixed in: 6.8.0-134.134
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (noble)Fixed in: 6.8.0-1060.63
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (noble)Fixed in: 6.8.0-1060.63+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (noble)Fixed in: 6.8.0-1063.69
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (noble)Fixed in: 6.8.0-1063.69+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (noble)Fixed in: 6.8.0-1060.61
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (noble)Fixed in: 6.8.0-1058.61
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (noble)Fixed in: 6.8.0-1057.58
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (noble)Fixed in: 6.8.1-1055.56
ubuntupatch availablevia ubuntu_usn
Product: linux-oem-6.17 (noble)Fixed in: 6.17.0-1028.28
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx (noble)Fixed in: 6.8.0-1032.33
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra (noble)Fixed in: 6.8.0-1029.30
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-6.8 (jammy)Fixed in: 6.8.0-134.134.1~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (noble)Fixed in: 6.8.0-134.134.1
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.8 (jammy)Fixed in: 6.8.0-1060.63~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi-realtime (noble)Fixed in: 6.8.0-2049.50
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (noble)Fixed in: 6.8.0-1062.69+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (noble)Fixed in: 6.8.0-134.134+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-6.17 (noble)Fixed in: 6.17.0-40.40~24.04.1

Vendor Advisories (16)

ubuntuUSN-8609-1

Linux kernel (Azure CVM) vulnerabilities

Jul 24, 2026
ubuntuUSN-8607-1

Linux kernel (Azure CVM) vulnerabilities

Jul 24, 2026
ubuntuUSN-8606-1

Linux kernel (Azure) vulnerabilities

Jul 24, 2026
ubuntuUSN-8605-1

Linux kernel (Azure CVM) vulnerabilities

Jul 24, 2026
ubuntuUSN-8604-1

Linux kernel (Azure) vulnerabilities

Jul 24, 2026
ubuntuUSN-8490-2

Linux kernel (Real-time) vulnerabilities

Jul 17, 2026
ubuntuUSN-8545-1

Linux kernel (HWE) vulnerabilities

Jul 15, 2026
ubuntuUSN-8492-5

Linux kernel (FIPS) vulnerabilities

Jul 10, 2026
ubuntuUSN-8492-3

Linux kernel (Raspberry Pi Real-time) vulnerabilities

Jul 6, 2026
ubuntuUSN-8499-1

Linux kernel (Xilinx) vulnerabilities

Jul 2, 2026
ubuntuUSN-8498-1

Linux kernel (NVIDIA Tegra) vulnerabilities

Jul 2, 2026
ubuntuUSN-8497-1

Linux kernel (Low Latency) vulnerabilities

Jul 2, 2026
ubuntuUSN-8492-2

Linux kernel vulnerabilities

Jul 2, 2026
ubuntuUSN-8492-1

Linux kernel vulnerabilities

Jul 1, 2026
ubuntuUSN-8491-1

Linux kernel (OEM) vulnerabilities

Jul 1, 2026
ubuntuUSN-8490-1

Linux kernel vulnerabilities

Jul 1, 2026

References

git.kernel.org / stable/c/190e5f808e8058640b408ccfed25440b441a718a
Patch
git.kernel.org / stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680
Patch
git.kernel.org / stable/c/54b48ae83de8bb06e65079d96368efe359d4909c
Patch
git.kernel.org / stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07
Patch
git.kernel.org / stable/c/b720c84087cb547f23ce03eab93568c1769e4556
Patch
git.kernel.org / stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7cc
Patch