CVE-2026-64414

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux65249feb6b3df9e17bab5911ee56fa7b0971e231 < 3b13e7635795394705920cca1e1db7e4ca2e334baffected
LinuxLinux65249feb6b3df9e17bab5911ee56fa7b0971e231 < fc5bfe63bacf8a3ae307b62b34206406ca733354affected
LinuxLinux65249feb6b3df9e17bab5911ee56fa7b0971e231 < 57056be3ec12e7d9ecd20a60d4060f510e4f284caffected
LinuxLinux65249feb6b3df9e17bab5911ee56fa7b0971e231 < da5b58478a9c1b85608c9e40a3b8432d071b409eaffected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc3 <= *unaffected

Weaknesses

References