kernel: net: use dst_dev_rcu() in sk_setup_caps()

In the Linux kernel, the following vulnerability has been resolved: net: use dstdevrcu in sksetupcaps Use RCU to protect accesses to dst-dev from sksetupcaps and skdstgsomaxsize. Also use dstdevrcu in ip6dstmtumaybeforward, and ipdstmtumaybeforward. ip4dsthoplimit can use dstdevnetrcu...

CVE-2025-40170 net: use dst_dev_rcu() in sk_setup_caps()

In the Linux kernel, the following vulnerability has been resolved: net: use dstdevrcu in sksetupcaps Use RCU to protect accesses to dst-dev from sksetupcaps and skdstgsomaxsize. Also use dstdevrcu in ip6dstmtumaybeforward, and ipdstmtumaybeforward. ip4dsthoplimit can use dstdevnetrcu...

CVE-2025-40170

CVE-2025-40170 affects the Linux kernel net subsystem. The vulnerability arises from unsafe accesses to dst->dev in sk_setup_caps() and related paths, not guarded by RCU. The fix adds RCU protection via dst_dev_rcu() (and dst_dev_rcu()-protected paths) in sk_setup_caps(), sk_dst_gso_max_size()...