{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-26589",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject variable offset alu on PTR_TO_FLOW_KEYS\n\nFor PTR_TO_FLOW_KEYS, check_flow_keys_access() only uses fixed off\nfor validation. However, variable offset ptr alu is not prohibited\nfor this ptr kind. So the variable offset is not checked.\n\nThe following prog is accepted:\n\n  func#0 @0\n  0: R1=ctx() R10=fp0\n  0: (bf) r6 = r1                       ; R1=ctx() R6_w=ctx()\n  1: (79) r7 = *(u64 *)(r6 +144)        ; R6_w=ctx() R7_w=flow_keys()\n  2: (b7) r8 = 1024                     ; R8_w=1024\n  3: (37) r8 /= 1                       ; R8_w=scalar()\n  4: (57) r8 &= 1024                    ; R8_w=scalar(smin=smin32=0,\n  smax=umax=smax32=umax32=1024,var_off=(0x0; 0x400))\n  5: (0f) r7 += r8\n  mark_precise: frame0: last_idx 5 first_idx 0 subseq_idx -1\n  mark_precise: frame0: regs=r8 stack= before 4: (57) r8 &= 1024\n  mark_precise: frame0: regs=r8 stack= before 3: (37) r8 /= 1\n  mark_precise: frame0: regs=r8 stack= before 2: (b7) r8 = 1024\n  6: R7_w=flow_keys(smin=smin32=0,smax=umax=smax32=umax32=1024,var_off\n  =(0x0; 0x400)) R8_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=1024,\n  var_off=(0x0; 0x400))\n  6: (79) r0 = *(u64 *)(r7 +0)          ; R0_w=scalar()\n  7: (95) exit\n\nThis prog loads flow_keys to r7, and adds the variable offset r8\nto r7, and finally causes out-of-bounds access:\n\n  BUG: unable to handle page fault for address: ffffc90014c80038\n  [...]\n  Call Trace:\n   <TASK>\n   bpf_dispatcher_nop_func include/linux/bpf.h:1231 [inline]\n   __bpf_prog_run include/linux/filter.h:651 [inline]\n   bpf_prog_run include/linux/filter.h:658 [inline]\n   bpf_prog_run_pin_on_cpu include/linux/filter.h:675 [inline]\n   bpf_flow_dissect+0x15f/0x350 net/core/flow_dissector.c:991\n   bpf_prog_test_run_flow_dissector+0x39d/0x620 net/bpf/test_run.c:1359\n   bpf_prog_test_run kernel/bpf/syscall.c:4107 [inline]\n   __sys_bpf+0xf8f/0x4560 kernel/bpf/syscall.c:5475\n   __do_sys_bpf kernel/bpf/syscall.c:5561 [inline]\n   __se_sys_bpf kernel/bpf/syscall.c:5559 [inline]\n   __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:5559\n   do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n   do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:83\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nFix this by rejecting ptr alu with variable offset on flow_keys.\nApplying the patch rejects the program with \"R7 pointer arithmetic\non flow_keys prohibited\"."
            }
        ]
    },
    "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": "d58e468b1112",
                                            "version_value": "29ffa63f21bc"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "4.20",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "4.20",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "5.15.148",
                                                        "lessThanOrEqual": "5.15.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.1.75",
                                                        "lessThanOrEqual": "6.1.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.14",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.7.2",
                                                        "lessThanOrEqual": "6.7.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.8",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0"
            },
            {
                "url": "https://git.kernel.org/stable/c/4108b86e324da42f7ed425bd71632fd844300dc8",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/4108b86e324da42f7ed425bd71632fd844300dc8"
            },
            {
                "url": "https://git.kernel.org/stable/c/e8d3872b617c21100c5ee4f64e513997a68c2e3d",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/e8d3872b617c21100c5ee4f64e513997a68c2e3d"
            },
            {
                "url": "https://git.kernel.org/stable/c/1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/1b500d5d6cecf98dd6ca88bc9e7ae1783c83e6d3"
            },
            {
                "url": "https://git.kernel.org/stable/c/22c7fa171a02d310e3a3f6ed46a698ca8a0060ed",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/22c7fa171a02d310e3a3f6ed46a698ca8a0060ed"
            }
        ]
    },
    "generator": {
        "engine": "bippy-9e1c9544281a"
    }
}