{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-46763",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Fix null-ptr-deref in GRO.\n\nWe observed a null-ptr-deref in fou_gro_receive() while shutting down\na host.  [0]\n\nThe NULL pointer is sk->sk_user_data, and the offset 8 is of protocol\nin struct fou.\n\nWhen fou_release() is called due to netns dismantle or explicit tunnel\nteardown, udp_tunnel_sock_release() sets NULL to sk->sk_user_data.\nThen, the tunnel socket is destroyed after a single RCU grace period.\n\nSo, in-flight udp4_gro_receive() could find the socket and execute the\nFOU GRO handler, where sk->sk_user_data could be NULL.\n\nLet's use rcu_dereference_sk_user_data() in fou_from_sock() and add NULL\nchecks in FOU GRO handlers.\n\n[0]:\nBUG: kernel NULL pointer dereference, address: 0000000000000008\n PF: supervisor read access in kernel mode\n PF: error_code(0x0000) - not-present page\nPGD 80000001032f4067 P4D 80000001032f4067 PUD 103240067 PMD 0\nSMP PTI\nCPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.216-204.855.amzn2.x86_64 #1\nHardware name: Amazon EC2 c5.large/, BIOS 1.0 10/16/2017\nRIP: 0010:fou_gro_receive (net/ipv4/fou.c:233) [fou]\nCode: 41 5f c3 cc cc cc cc e8 e7 2e 69 f4 0f 1f 80 00 00 00 00 0f 1f 44 00 00 49 89 f8 41 54 48 89 f7 48 89 d6 49 8b 80 88 02 00 00 <0f> b6 48 08 0f b7 42 4a 66 25 fd fd 80 cc 02 66 89 42 4a 0f b6 42\nRSP: 0018:ffffa330c0003d08 EFLAGS: 00010297\nRAX: 0000000000000000 RBX: ffff93d9e3a6b900 RCX: 0000000000000010\nRDX: ffff93d9e3a6b900 RSI: ffff93d9e3a6b900 RDI: ffff93dac2e24d08\nRBP: ffff93d9e3a6b900 R08: ffff93dacbce6400 R09: 0000000000000002\nR10: 0000000000000000 R11: ffffffffb5f369b0 R12: ffff93dacbce6400\nR13: ffff93dac2e24d08 R14: 0000000000000000 R15: ffffffffb4edd1c0\nFS:  0000000000000000(0000) GS:ffff93daee800000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000008 CR3: 0000000102140001 CR4: 00000000007706f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n <IRQ>\n ? show_trace_log_lvl (arch/x86/kernel/dumpstack.c:259)\n ? __die_body.cold (arch/x86/kernel/dumpstack.c:478 arch/x86/kernel/dumpstack.c:420)\n ? no_context (arch/x86/mm/fault.c:752)\n ? exc_page_fault (arch/x86/include/asm/irqflags.h:49 arch/x86/include/asm/irqflags.h:89 arch/x86/mm/fault.c:1435 arch/x86/mm/fault.c:1483)\n ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:571)\n ? fou_gro_receive (net/ipv4/fou.c:233) [fou]\n udp_gro_receive (include/linux/netdevice.h:2552 net/ipv4/udp_offload.c:559)\n udp4_gro_receive (net/ipv4/udp_offload.c:604)\n inet_gro_receive (net/ipv4/af_inet.c:1549 (discriminator 7))\n dev_gro_receive (net/core/dev.c:6035 (discriminator 4))\n napi_gro_receive (net/core/dev.c:6170)\n ena_clean_rx_irq (drivers/amazon/net/ena/ena_netdev.c:1558) [ena]\n ena_io_poll (drivers/amazon/net/ena/ena_netdev.c:1742) [ena]\n napi_poll (net/core/dev.c:6847)\n net_rx_action (net/core/dev.c:6917)\n __do_softirq (arch/x86/include/asm/jump_label.h:25 include/linux/jump_label.h:200 include/trace/events/irq.h:142 kernel/softirq.c:299)\n asm_call_irq_on_stack (arch/x86/entry/entry_64.S:809)\n</IRQ>\n do_softirq_own_stack (arch/x86/include/asm/irq_stack.h:27 arch/x86/include/asm/irq_stack.h:77 arch/x86/kernel/irq_64.c:77)\n irq_exit_rcu (kernel/softirq.c:393 kernel/softirq.c:423 kernel/softirq.c:435)\n common_interrupt (arch/x86/kernel/irq.c:239)\n asm_common_interrupt (arch/x86/include/asm/idtentry.h:626)\nRIP: 0010:acpi_idle_do_entry (arch/x86/include/asm/irqflags.h:49 arch/x86/include/asm/irqflags.h:89 drivers/acpi/processor_idle.c:114 drivers/acpi/processor_idle.c:575)\nCode: 8b 15 d1 3c c4 02 ed c3 cc cc cc cc 65 48 8b 04 25 40 ef 01 00 48 8b 00 a8 08 75 eb 0f 1f 44 00 00 0f 00 2d d5 09 55 00 fb f4 <fa> c3 cc cc cc cc e9 be fc ff ff 66 66 2e 0f 1f 84 00 00 00 00 00\nRSP: 0018:ffffffffb5603e58 EFLAGS: 00000246\nRAX: 0000000000004000 RBX: ffff93dac0929c00 RCX: ffff93daee833900\nRDX: ffff93daee800000 RSI: ffff93d\n---truncated---"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "d92283e338f6",
                                            "version_value": "231c235d2f7a"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.7",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "4.7",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.10.226",
                                                        "lessThanOrEqual": "5.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "5.15.167",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.1.110",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.6.51",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.10.10",
                                                        "lessThanOrEqual": "6.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.11",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
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            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/231c235d2f7a66f018f172e26ffd47c363f244ef",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/231c235d2f7a66f018f172e26ffd47c363f244ef"
            },
            {
                "url": "https://git.kernel.org/stable/c/4494bccb52ffda22ce5a1163a776d970e6229e08",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/4494bccb52ffda22ce5a1163a776d970e6229e08"
            },
            {
                "url": "https://git.kernel.org/stable/c/d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/d7567f098f54cb53ee3cee1c82e3d0ed9698b6b3"
            },
            {
                "url": "https://git.kernel.org/stable/c/1df42be305fe478ded1ee0c1d775f4ece713483b",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/1df42be305fe478ded1ee0c1d775f4ece713483b"
            },
            {
                "url": "https://git.kernel.org/stable/c/c46cd6aaca81040deaea3500ba75126963294bd9",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/c46cd6aaca81040deaea3500ba75126963294bd9"
            },
            {
                "url": "https://git.kernel.org/stable/c/7e4196935069947d8b70b09c1660b67b067e75cb",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/7e4196935069947d8b70b09c1660b67b067e75cb"
            }
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    "generator": {
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}