CVE-2026-98300 PUBLISHED

tcp: Don't call skb_clone_and_charge_r() for close()d listener in tcp_v6_do_rcv().

Assigner: Linux
Reserved: 25.09.2026 Published: 06.10.2026 Updated: 06.10.2026

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

tcp: Don't call skb_clone_and_charge_r() for close()d listener in tcp_v6_do_rcv().

tcp_v6_do_rcv() no longer calls skb_clone_and_charge_r() for TCP_LISTEN since commit 073d89808c06 ("net: fix data-races around sk->sk_forward_alloc").

However, there is still a small race window between tcp_v6_rcv() and tcp_v6_do_rcv(), where concurrent close() changes TCP_LISTEN to TCP_CLOSE, causing skb_clone_and_charge_r() to be called locklessly and resulting in the splat below. 0

Let's avoid calling skb_clone_and_charge_r() for TCP_CLOSE as well.

This is fine for non-listeners because tcp_rcv_state_process() drops skb for TCP_CLOSE and opt_skb was freed immediately anyway.

WARNING: net/ipv4/af_inet.c:162 at inet_sock_destruct+0x64d/0x810 net/ipv4/af_inet.c:162, CPU#1: ksoftirqd/1/28 Modules linked in: CPU: 1 UID: 0 PID: 28 Comm: ksoftirqd/1 Not tainted 7.2.0 #17 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 RIP: 0010:inet_sock_destruct+0x64d/0x810 net/ipv4/af_inet.c:162 Code: 3d 49 ff e9 06 fd ff ff e8 d0 5b 83 f8 90 0f 0b 90 e9 35 fe ff ff e8 c2 5b 83 f8 90 0f 0b 90 e9 c5 fe ff ff e8 b4 5b 83 f8 90 <0f> 0b 90 e9 04 ff ff ff e8 a6 5b 83 f8 90 0f 0b 90 e9 65 fe ff ff RSP: 0018:ffffc90000677bb8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880117bde80 RCX: ffffffff8957eb41 RDX: ffff88801dad5d00 RSI: ffffffff8957ec3c RDI: 0000000000000005 RBP: 00000000fffff000 R08: ffffffff8957eb41 R09: 00000000fffff000 R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880117bdf10 R14: ffffffff81c08eb7 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880d7ae5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f93a1021138 CR3: 00000000207a9000 CR4: 0000000000350ef0 Call Trace: <TASK> __sk_destruct+0x82/0xae0 net/core/sock.c:2356 rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core+0x59c/0x1100 kernel/rcu/tree.c:2897 handle_softirqs+0x1e4/0x9b0 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1076 [inline] run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068 smpboot_thread_fn+0x458/0xc80 kernel/smpboot.c:160 kthread+0x396/0x4a0 kernel/kthread.c:436 ret_from_fork+0x8e0/0xe40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK>

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to a23a3bc5004df6434de05797e0b6b2ecf864b86a (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to 1cb7f292a337fdc72a8219bcd9d40a9cf5e86db5 (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to 7d94602e77a4525611afebb23149145ac242afd7 (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to b727e3d58cb906f1506c1334dfba71fbb1338339 (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to 3e3394a13b603cc79b6a35480b8e20df6c716944 (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to 619bfbaacbff6a9822923f69f6af29d7f66a870c (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to 56d38839ef0bff6526d9bd73b6811bd00316b21c (excl.)
  • affected from e994b2f0fb9229aeff5eea9541320bd7b2ca8714 to 8e759cd1f6444a946bd1fd2b2b29eea582eea1d5 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 4.4 is affected
  • unaffected from 0 to 4.4 (excl.)
  • unaffected from 5.10.271 to 5.10.* (incl.)
  • unaffected from 5.15.222 to 5.15.* (incl.)
  • unaffected from 6.1.189 to 6.1.* (incl.)
  • unaffected from 6.6.158 to 6.6.* (incl.)
  • unaffected from 6.12.112 to 6.12.* (incl.)
  • unaffected from 6.18.54 to 6.18.* (incl.)
  • unaffected from 7.2.8 to 7.2.* (incl.)
  • unaffected from 7.3-rc4 to * (incl.)

References