CVE-2026-31665High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: fix use-after-free in timeout object destroy nft_ct_timeout_obj_destroy() frees the timeout object with kfree() immediately after nf_ct_untimeout(),…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_ct: fix use-after-free in timeout object destroy
nft_ct_timeout_obj_destroy() frees the timeout object with kfree() immediately after nf_ct_untimeout(), without waiting for an RCU grace period. Concurrent packet processing on other CPUs may still hold RCU-protected references to the timeout object obtained via rcu_dereference() in nf_ct_timeout_data().
Add an rcu_head to struct nf_ct_timeout and use kfree_rcu() to defer freeing until after an RCU grace period, matching the approach already used in nfnetlink_cttimeout.c.
KASAN report: BUG: KASAN: slab-use-after-free in nf_conntrack_tcp_packet+0x1381/0x29d0 Read of size 4 at addr ffff8881035fe19c by task exploit/80
Call Trace: nf_conntrack_tcp_packet+0x1381/0x29d0 nf_conntrack_in+0x612/0x8b0 nf_hook_slow+0x70/0x100 __ip_local_out+0x1b2/0x210 tcp_sendmsg_locked+0x722/0x1580 __sys_sendto+0x2d8/0x320
Allocated by task 75: nft_ct_timeout_obj_init+0xf6/0x290 nft_obj_init+0x107/0x1b0 nf_tables_newobj+0x680/0x9c0 nfnetlink_rcv_batch+0xc29/0xe00
Freed by task 26: nft_obj_destroy+0x3f/0xa0 nf_tables_trans_destroy_work+0x51c/0x5c0 process_one_work+0x2c4/0x5a0
Linux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < c458fc1c278a65ad5381083121d39a479973ebedLinux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < c581e5c8f2b59158f62efe61c1a3dc36189081ffLinux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < f16fe84879a5280f05ebbcea593a189ba0f3e79aLinux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < 070abdf1b04325b21a20a2a0c39a2208af107275Linux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < aa7cfa16f98f8ec3e6d47c34e1a8c1ae4b9b8b77Linux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < b42aca3660dc2627a29a38131597ca610dc451f9Linux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < d0983b48c10d1509fd795c155f8b1e832e1369ffLinux >= 7e0b2b57f01d183e1c84114f1f2287737358d748 < f8dca15a1b190787bbd03285304b569631160edaLinux 4.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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