CVE-2026-64414
HIGH
7,5
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
netfilter: handle unreadable frags
sashiko reports:
When an skb with unreadable fragments (such as from devmem TCP, where
skb_frags_readable(skb) returns false) is processed by the u32 module,
skb_copy_bits() will safely return a negative error code [..]
xt_u32: bail out with hotdrop in this case.
gather_frags: return -1, just as if we had no fragment header.
nfnetlink_queue: restrict to the linear part.
nfnetlink_log: restrict to the linear part.
v2:
- skb_zerocopy helpers don't copy readable flag, i.e. nfnetlink_queue
is broken too
xt_u32 shouldn't return true if hotdrop was set.
https://git.kernel.org/stable/c/3b13e7635795394705920cca1e1db7e4ca2e334b
https://git.kernel.org/stable/c/57056be3ec12e7d9ecd20a60d4060f510e4f284c
https://git.kernel.org/stable/c/da5b58478a9c1b85608c9e40a3b8432d071b409e
https://git.kernel.org/stable/c/fc5bfe63bacf8a3ae307b62b34206406ca733354