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CVE-2023-3776

20
FAUCET Score

CVE-2023-3776 is a use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component, affecting Debian and other Linux distributions. An attacker can exploit a flaw in reference counter handling within tcf_bind_filter() to trigger a use-after-free condition. This vulnerability carries a CVSS score of 7.8 (High), indicating that a local attacker with low privileges can achieve high impact on confidentiality, integrity, and availability. There is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), and it has not been added to CISA's KEV catalog. Community discussion and media coverage are minimal, suggesting low current attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.6.12, < 4.14.322CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.15, < 4.19.291CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.20, < 5.4.251CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 5.5, < 5.10.188CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 5.11, < 5.15.121CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.51%
Probability of exploitation in next 30 days
EPSS Percentile
40.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0051 is in the 80th percentile among its peer group of 17,070 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

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 (38)

microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 5.15.122.1-2
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 5.15.122.1-2
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 5.10.188.1-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 5.10.188.1-1
microsoftpatch availablevia msrc
Product: cm1 kernel 5.10.188.1-1 on CBL Mariner 1.0Fixed in: 5.10.188.1-1
microsoftpatch availablevia msrc
Product: cbl2 kernel 5.15.122.1-2 on CBL Mariner 2.0Fixed in: 5.15.122.1-2
microsoftpatch availablevia msrc
Product: 17823-16820Fixed in: 5.10.188.1-1
microsoftpatch availablevia msrc
Product: 17824-16823Fixed in: 5.15.122.1-2
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.6 Advanced Update Support(Disable again in 2026 - SPRHEL-7118)Fixed in: kernel-0:3.10.0-957.108.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.7 Advanced Update SupportFixed in: kernel-0:3.10.0-1062.82.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-477.27.1.rt7.290.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-477.27.1.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: kernel-0:4.18.0-147.94.1.el8_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: kernel-0:4.18.0-193.119.1.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceFixed in: kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceFixed in: kernel-0:4.18.0-193.119.1.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsFixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsFixed in: kernel-0:4.18.0-193.119.1.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: kernel-0:4.18.0-305.108.1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: kernel-rt-0:4.18.0-305.108.1.rt7.183.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: kernel-0:4.18.0-305.108.1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: kernel-0:4.18.0-305.108.1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: kernel-0:4.18.0-372.80.1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-0:5.14.0-284.30.1.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-rt-0:5.14.0-284.30.1.rt14.315.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: kernel-0:5.14.0-70.80.1.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: kernel-rt-0:5.14.0-70.80.1.rt21.151.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-372.80.1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 Extended Lifecycle SupportFixed in: kernel-0:2.6.32-754.53.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt-0:3.10.0-1160.105.1.rt56.1256.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kpatch-patch
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-1160.105.1.el7
View patch

Vendor Advisories (3)

microsoft2023-Aug/CVE-2023-3776

CVE-2023-3776

Aug 8, 2023
microsoft2023-Jul/CVE-2023-3776Important

Use-after-free in Linux kernel's net/sched: cls_fw component

Jul 11, 2023
redhatCVE-2023-3776Important

kernel: net/sched: cls_fw component can be exploited as result of failure in tcf_change_indev function

Jul 6, 2023

References

packetstormsecurity.com / files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.html
Third Party AdvisoryVDB Entry
packetstormsecurity.com / files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
Third Party AdvisoryVDB Entry
git.kernel.org / pub/scm/linux/kernel/git/torvalds/linux.git/commit
Mailing ListPatchVendor Advisory
kernel.dance / 0323bce598eea038714f941ce2b22541c46d488f
PatchVendor Advisory
lists.debian.org / debian-lts-announce/2023/10/msg00027.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2024/01/msg00004.html
Mailing ListThird Party Advisory
security.netapp.com / advisory/ntap-20240202-0003
Third Party Advisory
debian.org / security/2023/dsa-5480
Third Party Advisory
debian.org / security/2023/dsa-5492
Third Party Advisory