CVE-2025-21760: ndisc: extend RCU protection in ndisc_send_skb()

High severity · published Feb 27, 2025

CVE-2025-21760

ndisc: extend RCU protection in ndisc_send_skb()

8.1

CVSS

38%

EPSS

On KEV

Description

In the Linux kernel, the following vulnerability has been resolved: ndisc: extend RCU protection in ndisc_send_skb() ndisc_send_skb() can be called without RTNL or RCU held. Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() and avoid a potential UAF.

CVSS vector

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

Attack vector

Network

Complexity

High

Privileges

None

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)38.0% · higher than 99% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Kernel · Linux

2.6.26 before 5.4.291; 5.5 before 5.10.235; 5.11 before 5.15.179; 5.16 before 6.1.129; 6.2 before 6.6.79; 6.7 before 6.12.16; +3 more · source: NVD

Linux · Linux

1762f7e88eb34f653b4a915be99a102e347dd45e before 10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1; 1762f7e88eb34f653b4a915be99a102e347dd45e before 4d576202b90b1b95a7c428a80b536f91b8201bcc; 1762f7e88eb34f653b4a915be99a102e347dd45e before e24d225e4cb8cf108bde00b76594499b98f0a74d; 1762f7e88eb34f653b4a915be99a102e347dd45e before a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d; 1762f7e88eb34f653b4a915be99a102e347dd45e before ae38982f521621c216fc2f5182cd091f4734641d; 1762f7e88eb34f653b4a915be99a102e347dd45e before 789230e5a8c1097301afc802e242c79bc8835c67; +3 more · source: vendor

SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens

V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA

SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens

V3.1.6; V3.1.7; V3.1.6; V3.1.7 · source: CISA

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens

0; 0 · source: CISA

SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens

V3.1.6; V3.1.7 · source: CISA

In the news

VulnerabilityHigh

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

View CSAF Summary Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available. The following versions of Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP are affected: SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) vers:intdot/>=3.1.6 (CVE-2021-41617, CVE-2023-28531, CVE-2023-51384, CVE-2023-52927, CVE-2024-26783, CVE-2024-27056, CVE-2024-28956, CVE-2024-36903, CVE-2024-36927, CVE-2024-42079, CVE-2024-46786, CVE-2024-47736, CVE-2024-47809, CVE-2024-49968, CVE-2024-49994, CVE-2024-49998, CVE-2024-50014, CVE-2024-50063, CVE-2024-50164, CVE-2024-50298, CVE-2024-53124, CVE-2024-53170, CVE-2024-54458, CVE-2024-56631, CVE-2024-56703, CVE-2024-56719, CVE-2024-57917, CVE-2024-57924, CVE-2024-57973, CVE-2024-57977, CVE-2024-57979, CVE-2024-58011, CVE-2024-58016, CVE-2024-58020, CVE-2024-58056, CVE-2024-58058, CVE-2024-58061, CVE-2024-58086, CVE-2025-21645, CVE-2025-21648, CVE-2025-21655, CVE-2025-21676, CVE-2025-21682, CVE-2025-21702, CVE-2025-21705, CVE-2025-21706, CVE-2025-21707, CVE-2025-21718, CVE-2025-21731, CVE-2025-21745, CVE-2025-21758, CVE-2025-21760, CVE-2025-21764, CVE-2025-21765, CVE-2025-21780, CVE-2025-21795, CVE-2025-21796, CVE-2025-21802, CVE-2025-21814, CVE-2025-21846, CVE-2025-21853, CVE-2...

CVE-2021-41617 CVE-2023-28531 CVE-2023-51384

Jul 28, 2026·CISA Advisories

Affected product

Kernel

Linux

All Kernel CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-21760

CVE.org

https://www.cve.org/CVERecord?id=CVE-2025-21760

Patch