CVE-2025-21651 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: net: hns3: don't auto enable misc vector Currently, there is a time window between misc irq enabled and service task inited. If an interrupte is reported at this time, it will cause warning like below: [ 16.324639] Call trace: [ 16.324641] __queue_delayed_work+0xb8/0xe0 [ 16.324643] mod_delayed_work_on+0x78/0xd0 [ 16.324655] hclge_errhand_task_schedule+0x58/0x90 [hclge] [ 16.324662] hclge_misc_irq_handle+0x168/0x240 [hclge] [ 16.324666] __handle_irq_event_percpu+0x64/0x1e0 [ 16.324667] handle_irq_event+0x80/0x170 [ 16.324670] handle_fasteoi_edge_irq+0x110/0x2bc [ 16.324671] __handle_domain_irq+0x84/0xfc [ 16.324673] gic_handle_irq+0x88/0x2c0 [ 16.324674] el1_irq+0xb8/0x140 [ 16.324677] arch_cpu_idle+0x18/0x40 [ 16.324679] default_idle_call+0x5c/0x1bc [ 16.324682] cpuidle_idle_call+0x18c/0x1c4 [ 16.324684] do_idle+0x174/0x17c [ 16.324685] cpu_startup_entry+0x30/0x6c [ 16.324687] secondary_start_kernel+0x1a4/0x280 [ 16.324688] ---[ end trace 6aa0bff672a964aa ]--- So don't auto enable misc vector when request irq..

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.02%	0.12%	+0.10%
2	2025-10-17	0.05%	0.02%	-0.03%
3	2025-10-15	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.02%

0.12%

+0.10%

2025-10-17

0.05%

0.02%

-0.03%

2025-10-15

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:H/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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.	1.0	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:H/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.

1.0

3.6

[email protected]

OS Trackers for CVE-2025-21651

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2025-21651 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2.	https://security-tracker.debian.org/tracker/CVE-2025-21651
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2025-21651
`suse`	medium	CVE-2025-21651 severity moderate: SUSE including 415 source package names (2.1.3-4.43:kernel-default-base-6.4.0-24.1.21.4, 2.1.3-6.5:kernel-default-6.4.0-25.1, …), 674 product×package rows across 120 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/kvm-os-container, … (120 product lines)): Fixed 362, Known Affected 231, Known Not Affected 81.	https://www.suse.com/security/cve/CVE-2025-21651/
`ubuntu`	medium	CVE-2025-21651 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 147, released 136, not-affected 68, needed 55.	https://ubuntu.com/security/CVE-2025-21651

Affected software / configurations for CVE-2025-21651

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.4, < 6.12.10	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc1::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc2::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc3::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc4::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc5::::::
linux	linux_kernel	6.13	cpe:2.3:o:linux:linux_kernel:6.13:rc6::::::

References for CVE-2025-21651

URL	Tags
https://git.kernel.org/stable/c/98b1e3b27734139c76295754b6c317aa4df6d32e	Patch
https://git.kernel.org/stable/c/bcf430d3bb5525fc89a92a0c451c725ba1aa4306	Patch

URL

CVE-2025-21651 | net: hns3: don't auto enable misc vector

Exploit prediction scoring system (EPSS) score for CVE-2025-21651

Common vulnerability scoring system (CVSS) metrics for CVE-2025-21651

Weakness enumeration for CVE-2025-21651

OS Trackers for CVE-2025-21651

Affected software / configurations for CVE-2025-21651

References for CVE-2025-21651