{"id":"AZL-106080","summary":"CVE-2026-98300 affecting package kernel 6.6.157.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Don't call skb_clone_and_charge_r() for close()d listener in tcp_v6_do_rcv().\n\ntcp_v6_do_rcv() no longer calls skb_clone_and_charge_r() for\nTCP_LISTEN since commit 073d89808c06 (\"net: fix data-races around\nsk-\u003esk_forward_alloc\").\n\nHowever, there is still a small race window between tcp_v6_rcv()\nand tcp_v6_do_rcv(), where concurrent close() changes TCP_LISTEN\nto TCP_CLOSE, causing skb_clone_and_charge_r() to be called\nlocklessly and resulting in the splat below. [0]\n\nLet's avoid calling skb_clone_and_charge_r() for TCP_CLOSE as well.\n\nThis is fine for non-listeners because tcp_rcv_state_process()\ndrops skb for TCP_CLOSE and opt_skb was freed immediately anyway.\n\n[0]:\nsk-\u003esk_forward_alloc\nWARNING: net/ipv4/af_inet.c:162 at inet_sock_destruct+0x64d/0x810 net/ipv4/af_inet.c:162, CPU#1: ksoftirqd/1/28\nModules linked in:\nCPU: 1 UID: 0 PID: 28 Comm: ksoftirqd/1 Not tainted 7.2.0 #17 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-debian-1.17.0-1 04/01/2014\nRIP: 0010:inet_sock_destruct+0x64d/0x810 net/ipv4/af_inet.c:162\nCode: 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 \u003c0f\u003e 0b 90 e9 04 ff ff ff e8 a6 5b 83 f8 90 0f 0b 90 e9 65 fe ff ff\nRSP: 0018:ffffc90000677bb8 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: ffff8880117bde80 RCX: ffffffff8957eb41\nRDX: ffff88801dad5d00 RSI: ffffffff8957ec3c RDI: 0000000000000005\nRBP: 00000000fffff000 R08: ffffffff8957eb41 R09: 00000000fffff000\nR10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000\nR13: ffff8880117bdf10 R14: ffffffff81c08eb7 R15: 0000000000000003\nFS:  0000000000000000(0000) GS:ffff8880d7ae5000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f93a1021138 CR3: 00000000207a9000 CR4: 0000000000350ef0\nCall Trace:\n \u003cTASK\u003e\n __sk_destruct+0x82/0xae0 net/core/sock.c:2356\n rcu_do_batch kernel/rcu/tree.c:2645 [inline]\n rcu_core+0x59c/0x1100 kernel/rcu/tree.c:2897\n handle_softirqs+0x1e4/0x9b0 kernel/softirq.c:622\n run_ksoftirqd kernel/softirq.c:1076 [inline]\n run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068\n smpboot_thread_fn+0x458/0xc80 kernel/smpboot.c:160\n kthread+0x396/0x4a0 kernel/kthread.c:436\n ret_from_fork+0x8e0/0xe40 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \u003c/TASK\u003e","modified":"2026-10-08T05:35:32Z","published":"2026-10-06T09:18:20Z","upstream":["CVE-2026-98300"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98300"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-106080.json"}}],"schema_version":"1.9.0"}