CVE-2025-37808 | crypto: null - Use spin lock instead of mutex

In the Linux kernel, the following vulnerability has been resolved: crypto: null - Use spin lock instead of mutex As the null algorithm may be freed in softirq context through af_alg, use spin locks instead of mutexes to protect the default null algorithm.

Published: 2025-05-08 Last update: 2025-11-10 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-37808 is rated Low Risk (29.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-37808

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-04 0.01% 0.07% +0.05%
2 2025-11-11 0.06% 0.01% -0.05%
3 2025-11-04 — 0.06% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-37808

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2025-37808

OS Trackers for CVE-2025-37808

vendor priority summary link
debian not yet assigned CVE-2025-37808 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2025-37808
redhat medium — https://access.redhat.com/security/cve/CVE-2025-37808
suse medium CVE-2025-37808 severity moderate: SUSE including 52 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 293 product×package rows across 53 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Availability Extension 15 SP7, … (53 product lines)): Known Not Affected 267, Fixed 26. https://www.suse.com/security/cve/CVE-2025-37808/
ubuntu medium CVE-2025-37808 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, ignored 168, released 164, needed 45, not-affected 26, needs-triage 2, pending 1. https://ubuntu.com/security/CVE-2025-37808

Affected software / configurations for CVE-2025-37808

Vendor Product Version Raw CPE
linux linux_kernel >= 4.2, < 5.4.293 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.5, < 5.10.237 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.181 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.136 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.6.89 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.7, < 6.12.26 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.13, < 6.14.5 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2025-37808

URL Tags
https://git.kernel.org/stable/c/0486de3c1b8223138dcc614846bd76364f758de6 Patch
https://git.kernel.org/stable/c/1b66a5920b7fc7cc6251192a3fcad115b6d75dd5 Patch
https://git.kernel.org/stable/c/1dd4a8561d85dea545cf93f56efc48df8176e218 Patch
https://git.kernel.org/stable/c/8cf2945512a8c0ef74ddd5b5a4f6b6a2fb1a4efb Patch
https://git.kernel.org/stable/c/dcc47a028c24e793ce6d6efebfef1a1e92f80297 Patch
https://git.kernel.org/stable/c/e27244cbe10658a66b8775be7f0acc4ad2f618d6 Patch
https://git.kernel.org/stable/c/e307c54ac8198bf09652c72603ba6e6d97798410 Patch
https://git.kernel.org/stable/c/f7a5a5c8e1ec16a4b2041398abe95de0e14572ef Patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html Mailing List
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html Mailing List
cvelogic Threat Intelligence