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CVE-2025-40322

12
FAUCET Score

CVE-2025-40322 addresses an out-of-bounds read vulnerability in the Linux kernel's fbdev bitblit driver. Specifically, the bit_putcs_aligned()/unaligned() functions could read past the end of the built-in font array due to an improperly bounded glyph index. This flaw has a FAUCET Risk Score of 7/100, indicating a low to moderate severity, though specific CVSS metrics are not yet available. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
LinuxLinux
2.6.12CNA affecteddefault affected
LinuxLinux
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0998a6cb232674408a03e8561dc15aa266b2f53b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 18c4ef4e765a798b47980555ed665d78b71aeadf, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 901f44227072be60812fe8083e83e1533c04eed1, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9ba1a7802ca9a2590cef95b253e6526f4364477f, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a10cede006f9614b465cf25609a8753efbfd45cc, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c12003bf91fdff381c55ef54fef3e961a5af2545, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < db5c9a162d2f42bcc842b76b3d935dcc050a0eec, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < efaf89a75a29b2d179bf4fe63ca62852e93ad620CNA affecteddefault unaffected

CVSS Data

CVSS data has not been published for this CVE.

Exploit Intelligence

EPSS Score
0.18%
Probability of exploitation in next 30 days
EPSS Percentile
7.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15

Social Chatter

Media Mentions

Remediation

Patch Available

Vendor Patches (82)

microsoftpatch availablevia msrc
Product: azl3 kernel 6.6.112.1-2 on Azure Linux 3.0Fixed in: 6.6.117.1-1
microsoftpatch availablevia msrc
Product: 20613-17084Fixed in: 6.6.117.1-1
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 10.0 Extended Update SupportFixed in: kernel-0:6.12.0-55.58.1.el10_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-553.100.1.rt7.441.el8_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-553.100.1.el8_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: kernel-0:4.18.0-193.185.1.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: kernel-0:4.18.0-305.186.1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnFixed in: kernel-0:4.18.0-305.186.1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: kernel-0:4.18.0-372.179.1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: kernel-0:4.18.0-372.179.1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: kernel-0:4.18.0-372.179.1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceFixed in: kernel-0:4.18.0-477.128.1.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsFixed in: kernel-0:4.18.0-477.128.1.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-0:5.14.0-611.34.1.el9_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: kernel-0:5.14.0-70.165.1.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: kernel-rt-0:5.14.0-70.165.1.rt21.237.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsFixed in: kernel-0:5.14.0-284.156.1.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsFixed in: kernel-rt-0:5.14.0-284.156.1.rt14.441.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: kernel-0:5.14.0-427.110.1.el9_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.6 Extended Update SupportFixed in: kernel-0:5.14.0-570.86.1.el9_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: kernel-0:6.12.0-124.35.1.el10_1
View patch
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra (jammy)Fixed in: 5.15.0-1055.55
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (jammy)Fixed in: 5.15.0-1100.106
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx-zynqmp (jammy)Fixed in: 5.15.0-1067.71
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.8 (jammy)Fixed in: 6.8.0-1052.55~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-6.8 (jammy)Fixed in: 6.8.0-106.106~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-6.8 (jammy)Fixed in: 6.8.0-1049.49~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-6.8 (jammy)Fixed in: 6.8.0-106.106.1~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.8 (jammy)Fixed in: 6.8.0-1047.48~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (noble)Fixed in: 6.8.0-106.106
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (noble)Fixed in: 6.8.0-1050.53
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (noble)Fixed in: 6.8.0-1052.55
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (noble)Fixed in: 6.8.0-1048.53
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (noble)Fixed in: 6.8.0-1035.38
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (noble)Fixed in: 6.8.0-1049.49
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (noble)Fixed in: 6.8.0-106.106.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (noble)Fixed in: 6.8.0-1047.48
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (jammy)Fixed in: 5.15.0-1102.111
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-5.15 (focal)Fixed in: 5.15.0-1103.110~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-5.15 (focal)Fixed in: 5.15.0-1103.112~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-5.15 (focal)Fixed in: 5.15.0-173.183~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-intel-iotg-5.15 (focal)Fixed in: 5.15.0-1098.104~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (jammy)Fixed in: 5.15.0-1099.105
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-5.15 (focal)Fixed in: 5.15.0-173.183~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-5.15 (focal)Fixed in: 5.15.0-1100.106~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.8 (jammy)Fixed in: 6.8.1-1045.46~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (noble)Fixed in: 6.8.1-1045.46
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.8 (jammy)Fixed in: 6.8.0-1050.53~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra-igx (jammy)Fixed in: 5.15.0-1044.44
ubuntupatch availablevia ubuntu_usn
Product: linux-intel-iot-realtime (jammy)Fixed in: 5.15.0-1094.96
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.8 (jammy)Fixed in: 6.8.0-1051.57~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (questing)Fixed in: 6.17.0-1008.8
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-5.15 (focal)Fixed in: 5.15.0-1110.119~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx (noble)Fixed in: 6.8.0-1029.30
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi (noble)Fixed in: 6.8.0-1050.54
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi-realtime (noble)Fixed in: 6.8.0-2040.41
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi (jammy)Fixed in: 5.15.0-1097.100
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (noble)Fixed in: 6.8.0-1052.58+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (jammy)Fixed in: 5.15.0-1109.118+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (jammy)Fixed in: 5.15.0-1109.118
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (noble)Fixed in: 6.8.0-1051.57
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (jammy)Fixed in: 5.15.0-173.183+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (jammy)Fixed in: 5.15.0-1103.112+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (noble)Fixed in: 6.8.0-1050.53+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (jammy)Fixed in: 5.15.0-1103.110+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (noble)Fixed in: 6.8.0-106.106+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (noble)Fixed in: 6.8.0-1052.55+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-6.8 (jammy)Fixed in: 6.8.0-1049.52~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (noble)Fixed in: 6.8.0-1049.52
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-lowlatency (noble)Fixed in: 6.8.0-1049.52.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-5.15 (focal)Fixed in: 5.15.0-1097.100~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-tegra-5.15 (focal)Fixed in: 5.15.0-1055.55~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (jammy)Fixed in: 5.15.0-173.183
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (jammy)Fixed in: 5.15.0-1103.110
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (jammy)Fixed in: 5.15.0-1103.112
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (jammy)Fixed in: 5.15.0-1086.94
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (jammy)Fixed in: 5.15.0-1097.100
ubuntupatch availablevia ubuntu_usn
Product: linux-intel-iotg (jammy)Fixed in: 5.15.0-1098.104
ubuntupatch availablevia ubuntu_usn
Product: linux-kvm (jammy)Fixed in: 5.15.0-1095.100
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (jammy)Fixed in: 5.15.0-173.183
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (jammy)Fixed in: 5.15.0-1098.99
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-rt

Vendor Advisories (23)

ubuntuUSN-8261-1

Linux kernel (Xilinx) vulnerabilities

May 7, 2026
ubuntuUSN-8243-1

Linux kernel (Azure) vulnerabilities

May 7, 2026
ubuntuUSN-8163-2

Linux kernel (Azure) vulnerabilities

Apr 13, 2026
ubuntuUSN-8165-1

Linux kernel (Azure FIPS) vulnerabilities

Apr 9, 2026
ubuntuUSN-8163-1

Linux kernel (Azure FIPS) vulnerabilities

Apr 9, 2026
ubuntuUSN-8095-5

Linux kernel (Raspberry Pi) vulnerabilities

Apr 1, 2026
ubuntuUSN-8141-1

Linux kernel (Raspberry Pi) vulnerabilities

Apr 1, 2026
ubuntuUSN-8126-1

Linux kernel (Azure) vulnerabilities

Mar 25, 2026
ubuntuUSN-8125-1

Linux kernel (Azure) vulnerabilities

Mar 25, 2026
ubuntuUSN-8095-4

Linux kernel (AWS) vulnerabilities

Mar 23, 2026
ubuntuUSN-8096-5

Linux kernel (NVIDIA Tegra IGX) vulnerabilities

Mar 23, 2026
ubuntuUSN-8116-1

Linux kernel (Intel IoTG Real-time) vulnerabilities

Mar 23, 2026
ubuntuUSN-8096-4

Linux kernel (Real-time) vulnerabilities

Mar 17, 2026
ubuntuUSN-8096-3

Linux kernel vulnerabilities

Mar 17, 2026
ubuntuUSN-8095-3

Linux kernel (Real-time) vulnerabilities

Mar 17, 2026
ubuntuUSN-8096-2

Linux kernel (FIPS) vulnerabilities

Mar 16, 2026
ubuntuUSN-8095-2

Linux kernel (FIPS) vulnerabilities

Mar 16, 2026
ubuntuUSN-8100-1

Linux kernel (NVIDIA) vulnerabilities

Mar 16, 2026
ubuntuUSN-8096-1

Linux kernel vulnerabilities

Mar 16, 2026
ubuntuUSN-8095-1

Linux kernel vulnerabilities

Mar 16, 2026
ubuntuUSN-8029-3

Linux kernel (Azure) vulnerabilities

Feb 24, 2026
microsoft2025-Dec/CVE-2025-40322Moderate

fbdev: bitblit: bound-check glyph index in bit_putcs*

Dec 9, 2025
redhatCVE-2025-40322Moderate

kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling

Dec 8, 2025

References

git.kernel.org / stable/c/0998a6cb232674408a03e8561dc15aa266b2f53b
git.kernel.org / stable/c/18c4ef4e765a798b47980555ed665d78b71aeadf
git.kernel.org / stable/c/901f44227072be60812fe8083e83e1533c04eed1
git.kernel.org / stable/c/9ba1a7802ca9a2590cef95b253e6526f4364477f
git.kernel.org / stable/c/a10cede006f9614b465cf25609a8753efbfd45cc
git.kernel.org / stable/c/c12003bf91fdff381c55ef54fef3e961a5af2545
git.kernel.org / stable/c/db5c9a162d2f42bcc842b76b3d935dcc050a0eec
git.kernel.org / stable/c/efaf89a75a29b2d179bf4fe63ca62852e93ad620