Vulnerability details
CVE-2025-21791
Linux LinuxSiemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
vrf: use RCU protection in l3mdev_l3_out()
CVSS 3.1
7.8High
Official description
In the Linux kernel, the following vulnerability has been resolved: vrf: use RCU protection in l3mdev_l3_out() l3mdev_l3_out() can be called without RCU being held: raw_sendmsg() ip_push_pending_frames() ip_send_skb() ip_local_out() __ip_local_out() l3mdev_ip_out() Add rcu_read_lock() / rcu_read_unlock() pair to avoid a potential UAF.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4.9 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < 20a3489b396764cc9376e32a9172bee26a89dc3b | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < 5bb4228c32261d06e4fbece37ec3828bcc005b6b | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < c7574740be8ce68a57d0aece24987b9be2114c3c | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < c40cb5c03e37552d6eff963187109e2c3f78ef6f | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < 022cac1c693add610ae76ede03adf4d9d5a2cf21 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < 7b81425b517accefd46bee854d94954f5c57e019 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < 6d0ce46a93135d96b7fa075a94a88fe0da8e8773 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 ≤ v < 6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e | CVEProject cvelistV5 (CNA) |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | All | CVEProject cvelistV5 (CNA) |
References and advisories
11- https://git.kernel.org/stable/c/6ccaa5797f5362a2aad6baa6ddaf4715ac2dd51e
- https://git.kernel.org/stable/c/20a3489b396764cc9376e32a9172bee26a89dc3b
- https://git.kernel.org/stable/c/5bb4228c32261d06e4fbece37ec3828bcc005b6b
- https://git.kernel.org/stable/c/c7574740be8ce68a57d0aece24987b9be2114c3c
- https://git.kernel.org/stable/c/c40cb5c03e37552d6eff963187109e2c3f78ef6f
- https://git.kernel.org/stable/c/022cac1c693add610ae76ede03adf4d9d5a2cf21
- https://git.kernel.org/stable/c/7b81425b517accefd46bee854d94954f5c57e019
- https://git.kernel.org/stable/c/6d0ce46a93135d96b7fa075a94a88fe0da8e8773
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
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Details
- Published
- 2025-02-27
- Last updated
- 2026-10-15
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.26%
Probability of exploitation in 30 days
19%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-416Use After Free