CVE-2024-36031 [Critical] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: keys: Fix overwrite of key expiration on instantiation The expiry time of a key is unconditionally overwritten during instantiation, defaulting to turn it permanent. This causes a problem for DNS resolution as the expiration set by user-space is overwritten to TIME64_MAX, disabling further DNS updates. Fix this by restoring the condition that key_set_expiry is only called when the pre-parser sets a specific expiry.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	0.49%	0.04%	-0.45%
2	2025-11-18	0.02%	0.49%	+0.47%
3	2025-07-08	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

0.49%

0.04%

-0.45%

2025-11-18

0.02%

0.49%

+0.47%

2025-07-08

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. 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:N) No account or special rights needed—anonymous or random user is enough. 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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
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:N): No account or special rights needed—anonymous or random user is enough.
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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

OS Trackers for CVE-2024-36031

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2024-36031 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2024-36031
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2024-36031
`suse`	medium	CVE-2024-36031 severity moderate: SUSE including 392 source package names (2.1.3-4.35:kernel-default-6.4.0-24.1, 2.1.3-5.28:kernel-rt-6.4.0-22.1, …), 760 product×package rows across 139 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/rt-os-container, … (139 product lines)): Fixed 334, Known Affected 231, Known Not Affected 195.	https://www.suse.com/security/cve/CVE-2024-36031/
`ubuntu`	medium	CVE-2024-36031 medium priority: Ubuntu including 128 source packages (linux, linux-allwinner-5.19, …), 1139 status rows across 9 suites (bionic, focal, jammy, mantic, noble, oracular, trusty, upstream, xenial): DNE 808, ignored 144, released 127, not-affected 60.	https://ubuntu.com/security/CVE-2024-36031

Affected software / configurations for CVE-2024-36031

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.10.206, < 5.10.217	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.15.146, < 5.15.159	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.1.70, < 6.1.91	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.6.9, < 6.6.31	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.8.10	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.9, < 6.9.1	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2024-36031

URL	Tags
https://git.kernel.org/stable/c/25777f3f4e1f371d16a594925f31e37ce07b6ec7	Patch
https://git.kernel.org/stable/c/939a08bcd4334bad4b201e60bd0ae1f278d71d41	Patch
https://git.kernel.org/stable/c/9da27fb65a14c18efd4473e2e82b76b53ba60252	Patch
https://git.kernel.org/stable/c/ad2011ea787928b2accb5134f1e423b11fe80a8a	Patch
https://git.kernel.org/stable/c/cc219cb8afbc40ec100c0de941047bb29373126a	Patch
https://git.kernel.org/stable/c/e4519a016650e952ad9eb27937f8c447d5a4e06d	Patch
https://git.kernel.org/stable/c/ed79b93f725cd0da39a265dc23d77add1527b9be	Patch
https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html

URL

CVE-2024-36031 | keys: Fix overwrite of key expiration on instantiation

Exploit prediction scoring system (EPSS) score for CVE-2024-36031

Common vulnerability scoring system (CVSS) metrics for CVE-2024-36031

Weakness enumeration for CVE-2024-36031

OS Trackers for CVE-2024-36031

Affected software / configurations for CVE-2024-36031

References for CVE-2024-36031