CVE-2025-40139
High
Description
In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set(). smc_clc_prfx_set() is called during connect() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock() after kernel_getsockname(). Note that the returned value of smc_clc_prfx_set() is not used in the caller. While at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu() not to touch dst there.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux
PublishedNov 12, 2025
First seenNov 12, 2025
How to fix
Update
- Linux Linux5a2fccc4b32c13ddde3676f9e15e1a9baa7d6fde, 80d1fd39f4e37d836655e9f7ffccaf78925049bf, 956c57daba55cf9ed25d9f2512883b8a1a927599, 0736993bfe5c7a9c744ae3fac62d769dfdae54e1, 935d783e5de9b64587f3adb25641dd8385e64ddb or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | a046d57da19f812216f393e7c535f5858f793ac3 ≤ v < 5a2fccc4b32c13ddde3676f9e15e1a9baa7d6fde, a046d57da19f812216f393e7c535f5858f793ac3 ≤ v < 80d1fd39f4e37d836655e9f7ffccaf78925049bf, a046d57da19f812216f393e7c535f5858f793ac3 ≤ v < 956c57daba55cf9ed25d9f2512883b8a1a927599, a046d57da19f812216f393e7c535f5858f793ac3 ≤ v < 0736993bfe5c7a9c744ae3fac62d769dfdae54e1, a046d57da19f812216f393e7c535f5858f793ac3 ≤ v < 935d783e5de9b64587f3adb25641dd8385e64ddb, 4.11 | 5a2fccc4b32c13ddde3676f9e15e1a9baa7d6fde, 80d1fd39f4e37d836655e9f7ffccaf78925049bf, 956c57daba55cf9ed25d9f2512883b8a1a927599, 0736993bfe5c7a9c744ae3fac62d769dfdae54e1, 935d783e5de9b64587f3adb25641dd8385e64ddb |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.