CVE-2026-23399

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

nftables: nftdynset: fix possible stateful expression memleak in error path

If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released.

  unreferenced object (percpu) 0x607b97e9cab8 (size 16):     comm "softirq", pid 0, jiffies 4294931867     hex dump (first 16 bytes on cpu 3):       00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     backtrace (crc 0):       pcpuallocnoprof+0x453/0xd80       nftcounterclone+0x9c/0x190 [nftables]       nftexprclone+0x8f/0x1b0 [nftables]       nftdynsetnew+0x2cb/0x5f0 [nftables]       nftrhashupdate+0x236/0x11c0 [nftables]       nftdynseteval+0x11f/0x670 [nftables]       nftdochain+0x253/0x1700 [nftables]       nftdochainipv4+0x18d/0x270 [nftables]       nfhookslow+0xaa/0x1e0       iplocaldeliver+0x209/0x330