CVE-2026-23098 [High] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netrom: fix double-free in nr_route_frame() In nr_route_frame(), old_skb is immediately freed without checking if nr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL, the caller function will free old_skb again, causing a double-free bug. Therefore, to prevent this, we need to modify it to check whether nr_neigh->ax25 is NULL before freeing old_skb.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-05	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-05

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. 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.	2.8	5.9	416baaa9-dc9f-4396-8d5f-8c081fb06d67
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: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.	1.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.1

HIGH

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

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
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.

2.8

5.9

416baaa9-dc9f-4396-8d5f-8c081fb06d67

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: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.

1.8

5.9

[email protected]

OS Trackers for CVE-2026-23098

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2026-23098 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-2026-23098
`redhat`	—	—	https://access.redhat.com/security/cve/CVE-2026-23098
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2026-23098/
`ubuntu`	medium	CVE-2026-23098 medium priority: Ubuntu including 157 source packages (linux, linux-allwinner-5.19, …), 1256 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): DNE 871, ignored 173, released 102, needed 93, pending 16, not-affected 1.	https://ubuntu.com/security/CVE-2026-23098

Affected software / configurations for CVE-2026-23098

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 2.6.12.1, < 5.10.249	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.199	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.162	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.122	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.68	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.18.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:-::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc2::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc3::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc4::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::
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::::::

References for CVE-2026-23098

URL	Tags
https://git.kernel.org/stable/c/25aab6bfc31017a7e52035b99aef5c2b6bde8ffb	Patch
https://git.kernel.org/stable/c/6e0110ea90313b7c0558a0b77038274a6821caf8	Patch
https://git.kernel.org/stable/c/7c48fdf2d1349bb54815b56fb012b9d577707708	Patch
https://git.kernel.org/stable/c/94d1a8bd08af1f4cc345c5c29f5db1ea72b8bb8c	Patch
https://git.kernel.org/stable/c/9f5fa78d9980fe75a69835521627ab7943cb3d67	Patch
https://git.kernel.org/stable/c/ba1096c315283ee3292765f6aea4cca15816c4f7	Patch
https://git.kernel.org/stable/c/bd8955337e3764f912f49b360e176d8aaecf7016	Patch

URL

CVE-2026-23098 | netrom: fix double-free in nr_route_frame()

Exploit prediction scoring system (EPSS) score for CVE-2026-23098

Common vulnerability scoring system (CVSS) metrics for CVE-2026-23098

Weakness enumeration for CVE-2026-23098

OS Trackers for CVE-2026-23098

Affected software / configurations for CVE-2026-23098

References for CVE-2026-23098