CVE-2025-71120 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf A zero length gss_token results in pages == 0 and in_token->pages[0] is NULL. The code unconditionally evaluates page_address(in_token->pages[0]) for the initial memcpy, which can dereference NULL even when the copy length is 0. Guard the first memcpy so it only runs when length > 0.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-03-26	0.06%	0.03%	-0.04%
2	2026-02-18	0.02%	0.06%	+0.04%
3	2026-01-15	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-03-26

0.06%

0.03%

-0.04%

2026-02-18

0.02%

0.06%

+0.04%

2026-01-15

—

0.02%

—

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]

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]

OS Trackers for CVE-2025-71120

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2025-71120 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-2025-71120
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2025-71120
`suse`	high	—	https://www.suse.com/security/cve/CVE-2025-71120/
`ubuntu`	medium	CVE-2025-71120 medium priority: Ubuntu including 157 source packages (linux, linux-allwinner-5.19, …), 1562 status rows across 10 suites (bionic, focal, jammy, noble, plucky, questing, resolute, trusty, upstream, xenial): DNE 1157, ignored 180, released 150, needed 45, not-affected 18, pending 12.	https://ubuntu.com/security/CVE-2025-71120

Affected software / configurations for CVE-2025-71120

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.19.99, < 4.20	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.4.15, < 5.5	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5.1, < 5.10.248	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.198	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.160	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.120	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.64	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.18.3	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.5	cpe:2.3:o:linux:linux_kernel:5.5:-::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc1::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc2::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc3::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc4::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc5::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc6::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc7::::::
linux	linux_kernel	6.19	cpe:2.3:o:linux:linux_kernel:6.19:rc8::::::

References for CVE-2025-71120

URL	Tags
https://git.kernel.org/stable/c/1c8bb965e9b0559ff0f5690615a527c30f651dd8	Patch
https://git.kernel.org/stable/c/4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d	Patch
https://git.kernel.org/stable/c/7452d53f293379e2c38cfa8ad0694aa46fc4788b	Patch
https://git.kernel.org/stable/c/a2c6f25ab98b423f99ccd94874d655b8bcb01a19	Patch
https://git.kernel.org/stable/c/a8f1e445ce3545c90d69c9e8ff8f7821825fe810	Patch
https://git.kernel.org/stable/c/d4b69a6186b215d2dc1ebcab965ed88e8d41768d	Patch
https://git.kernel.org/stable/c/f9e53f69ac3bc4ef568b08d3542edac02e83fefd	Patch

URL

CVE-2025-71120 | SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf

Exploit prediction scoring system (EPSS) score for CVE-2025-71120

Common vulnerability scoring system (CVSS) metrics for CVE-2025-71120

Weakness enumeration for CVE-2025-71120

OS Trackers for CVE-2025-71120

Affected software / configurations for CVE-2025-71120

References for CVE-2025-71120