CVE-2022-50069 (GCVE-0-2022-50069)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2025-06-18 11:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: BPF: Fix potential bad pointer dereference in bpf_sys_bpf() The bpf_sys_bpf() helper function allows an eBPF program to load another eBPF program from within the kernel. In this case the argument union bpf_attr pointer (as well as the insns and license pointers inside) is a kernel address instead of a userspace address (which is the case of a usual bpf() syscall). To make the memory copying process in the syscall work in both cases, bpfptr_t was introduced to wrap around the pointer and distinguish its origin. Specifically, when copying memory contents from a bpfptr_t, a copy_from_user() is performed in case of a userspace address and a memcpy() is performed for a kernel address. This can lead to problems because the in-kernel pointer is never checked for validity. The problem happens when an eBPF syscall program tries to call bpf_sys_bpf() to load a program but provides a bad insns pointer -- say 0xdeadbeef -- in the bpf_attr union. The helper calls __sys_bpf() which would then call bpf_prog_load() to load the program. bpf_prog_load() is responsible for copying the eBPF instructions to the newly allocated memory for the program; it creates a kernel bpfptr_t for insns and invokes copy_from_bpfptr(). Internally, all bpfptr_t operations are backed by the corresponding sockptr_t operations, which performs direct memcpy() on kernel pointers for copy_from/strncpy_from operations. Therefore, the code is always happy to dereference the bad pointer to trigger a un-handle-able page fault and in turn an oops. However, this is not supposed to happen because at that point the eBPF program is already verified and should not cause a memory error. Sample KASAN trace: [ 25.685056][ T228] ================================================================== [ 25.685680][ T228] BUG: KASAN: user-memory-access in copy_from_bpfptr+0x21/0x30 [ 25.686210][ T228] Read of size 80 at addr 00000000deadbeef by task poc/228 [ 25.686732][ T228] [ 25.686893][ T228] CPU: 3 PID: 228 Comm: poc Not tainted 5.19.0-rc7 #7 [ 25.687375][ T228] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014 [ 25.687991][ T228] Call Trace: [ 25.688223][ T228] <TASK> [ 25.688429][ T228] dump_stack_lvl+0x73/0x9e [ 25.688747][ T228] print_report+0xea/0x200 [ 25.689061][ T228] ? copy_from_bpfptr+0x21/0x30 [ 25.689401][ T228] ? _printk+0x54/0x6e [ 25.689693][ T228] ? _raw_spin_lock_irqsave+0x70/0xd0 [ 25.690071][ T228] ? copy_from_bpfptr+0x21/0x30 [ 25.690412][ T228] kasan_report+0xb5/0xe0 [ 25.690716][ T228] ? copy_from_bpfptr+0x21/0x30 [ 25.691059][ T228] kasan_check_range+0x2bd/0x2e0 [ 25.691405][ T228] ? copy_from_bpfptr+0x21/0x30 [ 25.691734][ T228] memcpy+0x25/0x60 [ 25.692000][ T228] copy_from_bpfptr+0x21/0x30 [ 25.692328][ T228] bpf_prog_load+0x604/0x9e0 [ 25.692653][ T228] ? cap_capable+0xb4/0xe0 [ 25.692956][ T228] ? security_capable+0x4f/0x70 [ 25.693324][ T228] __sys_bpf+0x3af/0x580 [ 25.693635][ T228] bpf_sys_bpf+0x45/0x240 [ 25.693937][ T228] bpf_prog_f0ec79a5a3caca46_bpf_func1+0xa2/0xbd [ 25.694394][ T228] bpf_prog_run_pin_on_cpu+0x2f/0xb0 [ 25.694756][ T228] bpf_prog_test_run_syscall+0x146/0x1c0 [ 25.695144][ T228] bpf_prog_test_run+0x172/0x190 [ 25.695487][ T228] __sys_bpf+0x2c5/0x580 [ 25.695776][ T228] __x64_sys_bpf+0x3a/0x50 [ 25.696084][ T228] do_syscall_64+0x60/0x90 [ 25.696393][ T228] ? fpregs_assert_state_consistent+0x50/0x60 [ 25.696815][ T228] ? exit_to_user_mode_prepare+0x36/0xa0 [ 25.697202][ T228] ? syscall_exit_to_user_mode+0x20/0x40 [ 25.697586][ T228] ? do_syscall_64+0x6e/0x90 [ 25.697899][ T228] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 25.698312][ T228] RIP: 0033:0x7f6d543fb759 [ 25.698624][ T228] Code: 08 5b 89 e8 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 ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f6db7148ed7382b336c5827af33b5d9e992630e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41fd6cc88aaf7058b9dfc9c7a09cc80f99c8c830
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2dcac2f58f5a95ab092d1da237ffdc0da1832cf
Impacted products
Vendor Product Version
Linux Linux Version: af2ac3e13e45752af03c8a933f9b6e18841b128b
Version: af2ac3e13e45752af03c8a933f9b6e18841b128b
Version: af2ac3e13e45752af03c8a933f9b6e18841b128b
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   Linux Linux Version: 5.14
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/bpfptr.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "41fd6cc88aaf7058b9dfc9c7a09cc80f99c8c830",
              "status": "affected",
              "version": "af2ac3e13e45752af03c8a933f9b6e18841b128b",
              "versionType": "git"
            },
            {
              "lessThan": "1f6db7148ed7382b336c5827af33b5d9e992630e",
              "status": "affected",
              "version": "af2ac3e13e45752af03c8a933f9b6e18841b128b",
              "versionType": "git"
            },
            {
              "lessThan": "e2dcac2f58f5a95ab092d1da237ffdc0da1832cf",
              "status": "affected",
              "version": "af2ac3e13e45752af03c8a933f9b6e18841b128b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/bpfptr.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.63",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.4",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBPF: Fix potential bad pointer dereference in bpf_sys_bpf()\n\nThe bpf_sys_bpf() helper function allows an eBPF program to load another\neBPF program from within the kernel. In this case the argument union\nbpf_attr pointer (as well as the insns and license pointers inside) is a\nkernel address instead of a userspace address (which is the case of a\nusual bpf() syscall). To make the memory copying process in the syscall\nwork in both cases, bpfptr_t was introduced to wrap around the pointer\nand distinguish its origin. Specifically, when copying memory contents\nfrom a bpfptr_t, a copy_from_user() is performed in case of a userspace\naddress and a memcpy() is performed for a kernel address.\n\nThis can lead to problems because the in-kernel pointer is never checked\nfor validity. The problem happens when an eBPF syscall program tries to\ncall bpf_sys_bpf() to load a program but provides a bad insns pointer --\nsay 0xdeadbeef -- in the bpf_attr union. The helper calls __sys_bpf()\nwhich would then call bpf_prog_load() to load the program.\nbpf_prog_load() is responsible for copying the eBPF instructions to the\nnewly allocated memory for the program; it creates a kernel bpfptr_t for\ninsns and invokes copy_from_bpfptr(). Internally, all bpfptr_t\noperations are backed by the corresponding sockptr_t operations, which\nperforms direct memcpy() on kernel pointers for copy_from/strncpy_from\noperations. Therefore, the code is always happy to dereference the bad\npointer to trigger a un-handle-able page fault and in turn an oops.\nHowever, this is not supposed to happen because at that point the eBPF\nprogram is already verified and should not cause a memory error.\n\nSample KASAN trace:\n\n[   25.685056][  T228] ==================================================================\n[   25.685680][  T228] BUG: KASAN: user-memory-access in copy_from_bpfptr+0x21/0x30\n[   25.686210][  T228] Read of size 80 at addr 00000000deadbeef by task poc/228\n[   25.686732][  T228]\n[   25.686893][  T228] CPU: 3 PID: 228 Comm: poc Not tainted 5.19.0-rc7 #7\n[   25.687375][  T228] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014\n[   25.687991][  T228] Call Trace:\n[   25.688223][  T228]  \u003cTASK\u003e\n[   25.688429][  T228]  dump_stack_lvl+0x73/0x9e\n[   25.688747][  T228]  print_report+0xea/0x200\n[   25.689061][  T228]  ? copy_from_bpfptr+0x21/0x30\n[   25.689401][  T228]  ? _printk+0x54/0x6e\n[   25.689693][  T228]  ? _raw_spin_lock_irqsave+0x70/0xd0\n[   25.690071][  T228]  ? copy_from_bpfptr+0x21/0x30\n[   25.690412][  T228]  kasan_report+0xb5/0xe0\n[   25.690716][  T228]  ? copy_from_bpfptr+0x21/0x30\n[   25.691059][  T228]  kasan_check_range+0x2bd/0x2e0\n[   25.691405][  T228]  ? copy_from_bpfptr+0x21/0x30\n[   25.691734][  T228]  memcpy+0x25/0x60\n[   25.692000][  T228]  copy_from_bpfptr+0x21/0x30\n[   25.692328][  T228]  bpf_prog_load+0x604/0x9e0\n[   25.692653][  T228]  ? cap_capable+0xb4/0xe0\n[   25.692956][  T228]  ? security_capable+0x4f/0x70\n[   25.693324][  T228]  __sys_bpf+0x3af/0x580\n[   25.693635][  T228]  bpf_sys_bpf+0x45/0x240\n[   25.693937][  T228]  bpf_prog_f0ec79a5a3caca46_bpf_func1+0xa2/0xbd\n[   25.694394][  T228]  bpf_prog_run_pin_on_cpu+0x2f/0xb0\n[   25.694756][  T228]  bpf_prog_test_run_syscall+0x146/0x1c0\n[   25.695144][  T228]  bpf_prog_test_run+0x172/0x190\n[   25.695487][  T228]  __sys_bpf+0x2c5/0x580\n[   25.695776][  T228]  __x64_sys_bpf+0x3a/0x50\n[   25.696084][  T228]  do_syscall_64+0x60/0x90\n[   25.696393][  T228]  ? fpregs_assert_state_consistent+0x50/0x60\n[   25.696815][  T228]  ? exit_to_user_mode_prepare+0x36/0xa0\n[   25.697202][  T228]  ? syscall_exit_to_user_mode+0x20/0x40\n[   25.697586][  T228]  ? do_syscall_64+0x6e/0x90\n[   25.697899][  T228]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[   25.698312][  T228] RIP: 0033:0x7f6d543fb759\n[   25.698624][  T228] Code: 08 5b 89 e8 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 \n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:14.440Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/41fd6cc88aaf7058b9dfc9c7a09cc80f99c8c830"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f6db7148ed7382b336c5827af33b5d9e992630e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2dcac2f58f5a95ab092d1da237ffdc0da1832cf"
        }
      ],
      "title": "BPF: Fix potential bad pointer dereference in bpf_sys_bpf()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50069",
    "datePublished": "2025-06-18T11:02:14.440Z",
    "dateReserved": "2025-06-18T10:57:27.406Z",
    "dateUpdated": "2025-06-18T11:02:14.440Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50069\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:35.733\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBPF: Fix potential bad pointer dereference in bpf_sys_bpf()\\n\\nThe bpf_sys_bpf() helper function allows an eBPF program to load another\\neBPF program from within the kernel. In this case the argument union\\nbpf_attr pointer (as well as the insns and license pointers inside) is a\\nkernel address instead of a userspace address (which is the case of a\\nusual bpf() syscall). To make the memory copying process in the syscall\\nwork in both cases, bpfptr_t was introduced to wrap around the pointer\\nand distinguish its origin. Specifically, when copying memory contents\\nfrom a bpfptr_t, a copy_from_user() is performed in case of a userspace\\naddress and a memcpy() is performed for a kernel address.\\n\\nThis can lead to problems because the in-kernel pointer is never checked\\nfor validity. The problem happens when an eBPF syscall program tries to\\ncall bpf_sys_bpf() to load a program but provides a bad insns pointer --\\nsay 0xdeadbeef -- in the bpf_attr union. The helper calls __sys_bpf()\\nwhich would then call bpf_prog_load() to load the program.\\nbpf_prog_load() is responsible for copying the eBPF instructions to the\\nnewly allocated memory for the program; it creates a kernel bpfptr_t for\\ninsns and invokes copy_from_bpfptr(). Internally, all bpfptr_t\\noperations are backed by the corresponding sockptr_t operations, which\\nperforms direct memcpy() on kernel pointers for copy_from/strncpy_from\\noperations. Therefore, the code is always happy to dereference the bad\\npointer to trigger a un-handle-able page fault and in turn an oops.\\nHowever, this is not supposed to happen because at that point the eBPF\\nprogram is already verified and should not cause a memory error.\\n\\nSample KASAN trace:\\n\\n[   25.685056][  T228] ==================================================================\\n[   25.685680][  T228] BUG: KASAN: user-memory-access in copy_from_bpfptr+0x21/0x30\\n[   25.686210][  T228] Read of size 80 at addr 00000000deadbeef by task poc/228\\n[   25.686732][  T228]\\n[   25.686893][  T228] CPU: 3 PID: 228 Comm: poc Not tainted 5.19.0-rc7 #7\\n[   25.687375][  T228] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS d55cb5a 04/01/2014\\n[   25.687991][  T228] Call Trace:\\n[   25.688223][  T228]  \u003cTASK\u003e\\n[   25.688429][  T228]  dump_stack_lvl+0x73/0x9e\\n[   25.688747][  T228]  print_report+0xea/0x200\\n[   25.689061][  T228]  ? copy_from_bpfptr+0x21/0x30\\n[   25.689401][  T228]  ? _printk+0x54/0x6e\\n[   25.689693][  T228]  ? _raw_spin_lock_irqsave+0x70/0xd0\\n[   25.690071][  T228]  ? copy_from_bpfptr+0x21/0x30\\n[   25.690412][  T228]  kasan_report+0xb5/0xe0\\n[   25.690716][  T228]  ? copy_from_bpfptr+0x21/0x30\\n[   25.691059][  T228]  kasan_check_range+0x2bd/0x2e0\\n[   25.691405][  T228]  ? copy_from_bpfptr+0x21/0x30\\n[   25.691734][  T228]  memcpy+0x25/0x60\\n[   25.692000][  T228]  copy_from_bpfptr+0x21/0x30\\n[   25.692328][  T228]  bpf_prog_load+0x604/0x9e0\\n[   25.692653][  T228]  ? cap_capable+0xb4/0xe0\\n[   25.692956][  T228]  ? security_capable+0x4f/0x70\\n[   25.693324][  T228]  __sys_bpf+0x3af/0x580\\n[   25.693635][  T228]  bpf_sys_bpf+0x45/0x240\\n[   25.693937][  T228]  bpf_prog_f0ec79a5a3caca46_bpf_func1+0xa2/0xbd\\n[   25.694394][  T228]  bpf_prog_run_pin_on_cpu+0x2f/0xb0\\n[   25.694756][  T228]  bpf_prog_test_run_syscall+0x146/0x1c0\\n[   25.695144][  T228]  bpf_prog_test_run+0x172/0x190\\n[   25.695487][  T228]  __sys_bpf+0x2c5/0x580\\n[   25.695776][  T228]  __x64_sys_bpf+0x3a/0x50\\n[   25.696084][  T228]  do_syscall_64+0x60/0x90\\n[   25.696393][  T228]  ? fpregs_assert_state_consistent+0x50/0x60\\n[   25.696815][  T228]  ? exit_to_user_mode_prepare+0x36/0xa0\\n[   25.697202][  T228]  ? syscall_exit_to_user_mode+0x20/0x40\\n[   25.697586][  T228]  ? do_syscall_64+0x6e/0x90\\n[   25.697899][  T228]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n[   25.698312][  T228] RIP: 0033:0x7f6d543fb759\\n[   25.698624][  T228] Code: 08 5b 89 e8 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 \\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f6db7148ed7382b336c5827af33b5d9e992630e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41fd6cc88aaf7058b9dfc9c7a09cc80f99c8c830\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2dcac2f58f5a95ab092d1da237ffdc0da1832cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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