CVE-2025-22057

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: decrease cached dst counters in dst_release

Upstream fix ac888d58869b ("net: do not delay dst_entries_add() in dst_release()") moved decrementing the dst count from dst_destroy to dst_release to avoid accessing already freed data in case of netns dismantle. However in case CONFIG_DST_CACHE is enabled and OvS+tunnels are used, this fix is incomplete as the same issue will be seen for cached dsts:

Unable to handle kernel paging request at virtual address ffff5aabf6b5c000 Call trace: percpu_counter_add_batch+0x3c/0x160 (P) dst_release+0xec/0x108 dst_cache_destroy+0x68/0xd8 dst_destroy+0x13c/0x168 dst_destroy_rcu+0x1c/0xb0 rcu_do_batch+0x18c/0x7d0 rcu_core+0x174/0x378 rcu_core_si+0x18/0x30

Fix this by invalidating the cache, and thus decrementing cached dst counters, in dst_release too.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 < ccc331fd5bcae131d2627d5ef099d4a1f6540aeaaffected
LinuxLinuxd71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 < 92a5c18513117be69bc00419dd1724c1940f8fcdaffected
LinuxLinuxd71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 < 836415a8405c9665ae55352fc5ba865c242f5e4faffected
LinuxLinuxd71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 < e833e7ad64eb2f63867f65303be49ca30ee8819eaffected
LinuxLinuxd71785ffc7e7cae3fbdc4ea8a9d05b7a1c59f7b8 < 3a0a3ff6593d670af2451ec363ccb7b18aec0c0aaffected
LinuxLinux4.6affected
LinuxLinux0 < 4.6unaffected
LinuxLinux6.6.87 <= 6.6.*unaffected
LinuxLinux6.12.23 <= 6.12.*unaffected
LinuxLinux6.13.11 <= 6.13.*unaffected
LinuxLinux6.14.2 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

References