{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-43910",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: add missing check_func_arg_reg_off() to prevent out-of-bounds memory accesses\n\nCurrently, it's possible to pass in a modified CONST_PTR_TO_DYNPTR to\na global function as an argument. The adverse effects of this is that\nBPF helpers can continue to make use of this modified\nCONST_PTR_TO_DYNPTR from within the context of the global function,\nwhich can unintentionally result in out-of-bounds memory accesses and\ntherefore compromise overall system stability i.e.\n\n[  244.157771] BUG: KASAN: slab-out-of-bounds in bpf_dynptr_data+0x137/0x140\n[  244.161345] Read of size 8 at addr ffff88810914be68 by task test_progs/302\n[  244.167151] CPU: 0 PID: 302 Comm: test_progs Tainted: G O E 6.10.0-rc3-00131-g66b586715063 #533\n[  244.174318] Call Trace:\n[  244.175787]  <TASK>\n[  244.177356]  dump_stack_lvl+0x66/0xa0\n[  244.179531]  print_report+0xce/0x670\n[  244.182314]  ? __virt_addr_valid+0x200/0x3e0\n[  244.184908]  kasan_report+0xd7/0x110\n[  244.187408]  ? bpf_dynptr_data+0x137/0x140\n[  244.189714]  ? bpf_dynptr_data+0x137/0x140\n[  244.192020]  bpf_dynptr_data+0x137/0x140\n[  244.194264]  bpf_prog_b02a02fdd2bdc5fa_global_call_bpf_dynptr_data+0x22/0x26\n[  244.198044]  bpf_prog_b0fe7b9d7dc3abde_callback_adjust_bpf_dynptr_reg_off+0x1f/0x23\n[  244.202136]  bpf_user_ringbuf_drain+0x2c7/0x570\n[  244.204744]  ? 0xffffffffc0009e58\n[  244.206593]  ? __pfx_bpf_user_ringbuf_drain+0x10/0x10\n[  244.209795]  bpf_prog_33ab33f6a804ba2d_user_ringbuf_callback_const_ptr_to_dynptr_reg_off+0x47/0x4b\n[  244.215922]  bpf_trampoline_6442502480+0x43/0xe3\n[  244.218691]  __x64_sys_prlimit64+0x9/0xf0\n[  244.220912]  do_syscall_64+0xc1/0x1d0\n[  244.223043]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[  244.226458] RIP: 0033:0x7ffa3eb8f059\n[  244.228582] Code: 08 89 e8 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 8f 1d 0d 00 f7 d8 64 89 01 48\n[  244.241307] RSP: 002b:00007ffa3e9c6eb8 EFLAGS: 00000206 ORIG_RAX: 000000000000012e\n[  244.246474] RAX: ffffffffffffffda RBX: 00007ffa3e9c7cdc RCX: 00007ffa3eb8f059\n[  244.250478] RDX: 00007ffa3eb162b4 RSI: 0000000000000000 RDI: 00007ffa3e9c7fb0\n[  244.255396] RBP: 00007ffa3e9c6ed0 R08: 00007ffa3e9c76c0 R09: 0000000000000000\n[  244.260195] R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffff80\n[  244.264201] R13: 000000000000001c R14: 00007ffc5d6b4260 R15: 00007ffa3e1c7000\n[  244.268303]  </TASK>\n\nAdd a check_func_arg_reg_off() to the path in which the BPF verifier\nverifies the arguments of global function arguments, specifically\nthose which take an argument of type ARG_PTR_TO_DYNPTR |\nMEM_RDONLY. Also, process_dynptr_func() doesn't appear to perform any\nexplicit and strict type matching on the supplied register type, so\nlet's also enforce that a register either type PTR_TO_STACK or\nCONST_PTR_TO_DYNPTR is by the caller."
            }
        ]
    },
    "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": "a64bfe618665",
                                            "version_value": "13663a7c644b"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.8",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.8",
                                                        "status": "unaffected",
                                                        "versionType": "custom"
                                                    },
                                                    {
                                                        "version": "6.10.5",
                                                        "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/13663a7c644bf1dedaf461d07252db5d76c8759a",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/13663a7c644bf1dedaf461d07252db5d76c8759a"
            },
            {
                "url": "https://git.kernel.org/stable/c/ec2b9a5e11e51fea1bb04c1e7e471952e887e874",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ec2b9a5e11e51fea1bb04c1e7e471952e887e874"
            }
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}