CVE-2025-37924: debian debian_linux Use After Free

CVSS: 9.8v3.1CriticalModified

AliasesUBUNTU-CVE-2025-37924DEBIAN-CVE-2025-37924

Published 20-05-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-37924 is a critical (CVSS 9.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 22.05% chance of exploitation in the next 30 days, higher than 97.6% of scored vulnerabilities.

Overall risk

70/100

0100

High · default modelHow is this calculated?

CVSS score

9.8/10

010

Critical · v3.1 (CVE.org)

EPSS score

22.05%

0%100%

High · +1.31 pp in 30 days

KEVNot listedIn no KEV catalog

RansomwareNone recordedNo known use recorded

Public exploits0No public exploits recorded

Timeline

20-05-2025
PublishedVulnerability first disclosed.
15-10-2026
Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

CVSS metrics

5 scores · 4 sources · 2 versions

v4.07.7v3.19.8

EPSS trend

Probability

22.05%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

+1.31 pp

From 20.74% on 19-09-2026

19-09-202619-10-2026

EPSS score

22.05%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Ubuntu133 products

linux< 5.15.0-185.195 | < 6.8.0-100.100
linux-allwinner-5.19All versions (No fix recorded)
linux-aws< 5.15.0-1111.118 | < 6.8.0-1046.49
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)

linux-aws-5.13All versions (No fix recorded)
linux-aws-5.15< 5.15.0-1111.118~20.04.1
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.14< 6.14.0-1009.9~24.04.1
linux-aws-6.2All versions (No fix recorded)
linux-aws-6.5All versions (No fix recorded)
linux-aws-6.8< 6.8.0-1046.49~22.04.1
linux-aws-fipsAll versions (No fix recorded) | < 5.15.0-1111.118+fips1 | < 6.8.0-1046.49+fips1
linux-azureAll versions (No fix recorded) | < 5.15.0-1116.125 | < 6.8.0-1046.52
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1116.125~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.8All versions (No fix recorded)
linux-azure-6.11All versions (No fix recorded)
linux-azure-6.2All versions (No fix recorded)
linux-azure-6.5All versions (No fix recorded)
linux-azure-6.8< 6.8.0-1051.57~22.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 5.15.0-1116.125 | < 6.8.0-1046.53
linux-azure-fde-5.15< 5.15.0-1116.125~20.04.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fde-6.2All versions (No fix recorded)
linux-azure-fde-6.8< 6.8.0-1046.53~22.04.1
linux-azure-fipsAll versions (No fix recorded) | < 5.15.0-1116.125+fips1 | < 6.8.0-1046.52+fips1
linux-azure-nvidiaAll versions (No fix recorded)
linux-bluefield< 5.15.0-1095.97 | < 6.8.0-1016.20
linux-fipsAll versions (No fix recorded) | < 5.15.0-185.195+fips1 | < 6.8.0-100.100+fips1
linux-gcpAll versions (No fix recorded) | < 5.15.0-1111.121 | < 6.8.0-1047.50
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1111.121~20.04.1
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.11All versions (No fix recorded)
linux-gcp-6.14< 6.14.0-1011.11~24.04.1
linux-gcp-6.2All versions (No fix recorded)
linux-gcp-6.5All versions (No fix recorded)
linux-gcp-6.8< 6.8.0-1047.50~22.04.2
linux-gcp-fipsAll versions (No fix recorded) | < 5.15.0-1111.121+fips1 | < 6.8.0-1047.50+fips1
linux-gkeAll versions (No fix recorded) | < 5.15.0-1107.113 | < 6.8.0-1043.48
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeopAll versions (No fix recorded) | < 5.15.0-1094.102 | < 6.8.0-1030.33
linux-gkeop-5.15All versions (No fix recorded)
linux-gkeop-5.4All versions (No fix recorded)
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-185.195~20.04.1
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.11All versions (No fix recorded)
linux-hwe-6.2All versions (No fix recorded)
linux-hwe-6.5All versions (No fix recorded)
linux-hwe-6.8< 6.8.0-100.100~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.15.0-1105.109 | < 6.8.0-1044.44
linux-ibm-5.15< 5.15.0-1105.109~20.04.1
linux-ibm-6.8< 6.8.0-1044.44~22.04.1
linux-intelAll versions (No fix recorded)
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded) | < 5.15.0-1103.105
linux-intel-iotg< 5.15.0-1106.112
linux-intel-iotg-5.15< 5.15.0-1106.112~20.04.1
linux-kvm< 5.15.0-1103.108
linux-lowlatency< 5.15.0-183.193 | < 6.8.0-100.100.1
linux-lowlatency-hwe-5.15< 5.15.0-183.193~20.04.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.11All versions (No fix recorded)
linux-lowlatency-hwe-6.2All versions (No fix recorded)
linux-lowlatency-hwe-6.5All versions (No fix recorded)
linux-lowlatency-hwe-6.8< 6.8.0-100.100.1~22.04.1
linux-nvidia< 5.15.0-1106.107 | < 6.8.0-1046.49
linux-nvidia-6.11All versions (No fix recorded)
linux-nvidia-6.2All versions (No fix recorded)
linux-nvidia-6.5All versions (No fix recorded)
linux-nvidia-6.8< 6.8.0-1046.49~22.04.1
linux-nvidia-lowlatency< 6.8.0-1046.49.1
linux-nvidia-tegra< 5.15.0-1063.63 | < 6.8.0-1020.20
linux-nvidia-tegra-5.15< 5.15.0-1063.63~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1052.52
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0All versions (No fix recorded)
linux-oem-6.1All versions (No fix recorded)
linux-oem-6.11All versions (No fix recorded)
linux-oem-6.14< 6.14.0-1007.7
linux-oem-6.5All versions (No fix recorded)
linux-oem-6.8All versions (No fix recorded)
linux-oracle< 5.15.0-1108.114 | < 6.8.0-1043.44
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1108.114~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.8All versions (No fix recorded)
linux-oracle-6.14< 6.14.0-1009.9~24.04.1
linux-oracle-6.5All versions (No fix recorded)
linux-oracle-6.8< 6.8.0-1043.44~22.04.1
linux-raspi< 5.15.0-1105.108 | < 6.8.0-1047.51
linux-raspi-realtimeAll versions (No fix recorded) | < 6.8.0-2037.38
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1110.119 | < 6.8.1-1041.42
linux-realtime-6.14< 6.14.0-1010.10~24.04.1
linux-realtime-6.8< 6.8.1-1041.42~22.04.1
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1105.109~20.04.1
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-riscv-6.14< 6.14.0-24.24.1~24.04.1
linux-riscv-6.5All versions (No fix recorded)
linux-riscv-6.8< 6.8.0-100.100~22.04.1
linux-starfive-5.19All versions (No fix recorded)
linux-starfive-6.2All versions (No fix recorded)
linux-starfive-6.5All versions (No fix recorded)
linux-xilinx< 6.8.0-1023.24
linux-xilinx-zynqmp< 5.15.0-1074.78

Show all 133

Debian2 products

linux< 6.1.140-1 | < 6.12.29-1
debian_linuxEOL11.0

Linux2 products

linux≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < e34a33d5d7e87399af0a138bb32f6a3e95dd83d2 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < b447463562238428503cfba1c913261047772f90 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < e18c616718018dfc440e4a2d2b94e28fe91b1861 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 28c756738af44a404a91b77830d017bb0c525890 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < e86e9134e1d1c90a960dd57f59ce574d27b9a124 | 5.15
linux_kernel≥ 5.15, < 6.1.138 | ≥ 6.2, < 6.6.90 | ≥ 6.7, < 6.12.28 | ≥ 6.13, < 6.14.6 | 6.15:rc1 | 6.15:rc2 | 6.15:rc3 | 6.15:rc4

3 vendors · 137 products