CVE-2022-50674 (GCVE-0-2022-50674)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2025-12-09 01:29
VLAI?
Title
riscv: vdso: fix NULL deference in vdso_join_timens() when vfork
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: vdso: fix NULL deference in vdso_join_timens() when vfork Testing tools/testing/selftests/timens/vfork_exec.c got below kernel log: [ 6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020 [ 6.842255] Oops [#1] [ 6.842871] Modules linked in: [ 6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8 [ 6.845861] Hardware name: riscv-virtio,qemu (DT) [ 6.848009] epc : vdso_join_timens+0xd2/0x110 [ 6.850097] ra : vdso_join_timens+0xd2/0x110 [ 6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0 [ 6.852562] gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030 [ 6.853852] t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40 [ 6.854984] s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c [ 6.856221] a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000 [ 6.858114] a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038 [ 6.859484] s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000 [ 6.860751] s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38 [ 6.862029] s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e [ 6.863304] s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f [ 6.864565] t5 : ffffffff80d11130 t6 : ff6000000181fa00 [ 6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause: 000000000000000d [ 6.868046] [<ffffffff8008dc94>] timens_commit+0x38/0x11a [ 6.869089] [<ffffffff8008dde8>] timens_on_fork+0x72/0xb4 [ 6.870055] [<ffffffff80190096>] begin_new_exec+0x3c6/0x9f0 [ 6.871231] [<ffffffff801d826c>] load_elf_binary+0x628/0x1214 [ 6.872304] [<ffffffff8018ee7a>] bprm_execve+0x1f2/0x4e4 [ 6.873243] [<ffffffff8018f90c>] do_execveat_common+0x16e/0x1ee [ 6.874258] [<ffffffff8018f9c8>] sys_execve+0x3c/0x48 [ 6.875162] [<ffffffff80003556>] ret_from_syscall+0x0/0x2 [ 6.877484] ---[ end trace 0000000000000000 ]--- This is because the mm->context.vdso_info is NULL in vfork case. From another side, mm->context.vdso_info either points to vdso info for RV64 or vdso info for compat, there's no need to bloat riscv's mm_context_t, we can handle the difference when setup the additional page for vdso.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3092eb45637573c5e435fbf5eaf9516316e5f9c6 , < df30c4feba51beeb138f3518c2421abc8cbda3c1 (git)
Affected: 3092eb45637573c5e435fbf5eaf9516316e5f9c6 , < f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4 (git)
Affected: 3092eb45637573c5e435fbf5eaf9516316e5f9c6 , < a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9 (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/include/asm/mmu.h",
            "arch/riscv/kernel/vdso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "df30c4feba51beeb138f3518c2421abc8cbda3c1",
              "status": "affected",
              "version": "3092eb45637573c5e435fbf5eaf9516316e5f9c6",
              "versionType": "git"
            },
            {
              "lessThan": "f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4",
              "status": "affected",
              "version": "3092eb45637573c5e435fbf5eaf9516316e5f9c6",
              "versionType": "git"
            },
            {
              "lessThan": "a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9",
              "status": "affected",
              "version": "3092eb45637573c5e435fbf5eaf9516316e5f9c6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/include/asm/mmu.h",
            "arch/riscv/kernel/vdso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.17",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.3",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: vdso: fix NULL deference in vdso_join_timens() when vfork\n\nTesting tools/testing/selftests/timens/vfork_exec.c got below\nkernel log:\n\n[    6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020\n[    6.842255] Oops [#1]\n[    6.842871] Modules linked in:\n[    6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8\n[    6.845861] Hardware name: riscv-virtio,qemu (DT)\n[    6.848009] epc : vdso_join_timens+0xd2/0x110\n[    6.850097]  ra : vdso_join_timens+0xd2/0x110\n[    6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0\n[    6.852562]  gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030\n[    6.853852]  t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40\n[    6.854984]  s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c\n[    6.856221]  a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000\n[    6.858114]  a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038\n[    6.859484]  s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000\n[    6.860751]  s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38\n[    6.862029]  s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e\n[    6.863304]  s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f\n[    6.864565]  t5 : ffffffff80d11130 t6 : ff6000000181fa00\n[    6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause: 000000000000000d\n[    6.868046] [\u003cffffffff8008dc94\u003e] timens_commit+0x38/0x11a\n[    6.869089] [\u003cffffffff8008dde8\u003e] timens_on_fork+0x72/0xb4\n[    6.870055] [\u003cffffffff80190096\u003e] begin_new_exec+0x3c6/0x9f0\n[    6.871231] [\u003cffffffff801d826c\u003e] load_elf_binary+0x628/0x1214\n[    6.872304] [\u003cffffffff8018ee7a\u003e] bprm_execve+0x1f2/0x4e4\n[    6.873243] [\u003cffffffff8018f90c\u003e] do_execveat_common+0x16e/0x1ee\n[    6.874258] [\u003cffffffff8018f9c8\u003e] sys_execve+0x3c/0x48\n[    6.875162] [\u003cffffffff80003556\u003e] ret_from_syscall+0x0/0x2\n[    6.877484] ---[ end trace 0000000000000000 ]---\n\nThis is because the mm-\u003econtext.vdso_info is NULL in vfork case. From\nanother side, mm-\u003econtext.vdso_info either points to vdso info\nfor RV64 or vdso info for compat, there\u0027s no need to bloat riscv\u0027s\nmm_context_t, we can handle the difference when setup the additional\npage for vdso."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T01:29:26.600Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/df30c4feba51beeb138f3518c2421abc8cbda3c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9"
        }
      ],
      "title": "riscv: vdso: fix NULL deference in vdso_join_timens() when vfork",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50674",
    "datePublished": "2025-12-09T01:29:26.600Z",
    "dateReserved": "2025-12-09T01:26:45.991Z",
    "dateUpdated": "2025-12-09T01:29:26.600Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50674\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T16:17:19.610\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nriscv: vdso: fix NULL deference in vdso_join_timens() when vfork\\n\\nTesting tools/testing/selftests/timens/vfork_exec.c got below\\nkernel log:\\n\\n[    6.838454] Unable to handle kernel access to user memory without uaccess routines at virtual address 0000000000000020\\n[    6.842255] Oops [#1]\\n[    6.842871] Modules linked in:\\n[    6.844249] CPU: 1 PID: 64 Comm: vfork_exec Not tainted 6.0.0-rc3-rt15+ #8\\n[    6.845861] Hardware name: riscv-virtio,qemu (DT)\\n[    6.848009] epc : vdso_join_timens+0xd2/0x110\\n[    6.850097]  ra : vdso_join_timens+0xd2/0x110\\n[    6.851164] epc : ffffffff8000635c ra : ffffffff8000635c sp : ff6000000181fbf0\\n[    6.852562]  gp : ffffffff80cff648 tp : ff60000000fdb700 t0 : 3030303030303030\\n[    6.853852]  t1 : 0000000000000030 t2 : 3030303030303030 s0 : ff6000000181fc40\\n[    6.854984]  s1 : ff60000001e6c000 a0 : 0000000000000010 a1 : ffffffff8005654c\\n[    6.856221]  a2 : 00000000ffffefff a3 : 0000000000000000 a4 : 0000000000000000\\n[    6.858114]  a5 : 0000000000000000 a6 : 0000000000000008 a7 : 0000000000000038\\n[    6.859484]  s2 : ff60000001e6c068 s3 : ff6000000108abb0 s4 : 0000000000000000\\n[    6.860751]  s5 : 0000000000001000 s6 : ffffffff8089dc40 s7 : ffffffff8089dc38\\n[    6.862029]  s8 : ffffffff8089dc30 s9 : ff60000000fdbe38 s10: 000000000000005e\\n[    6.863304]  s11: ffffffff80cc3510 t3 : ffffffff80d1112f t4 : ffffffff80d1112f\\n[    6.864565]  t5 : ffffffff80d11130 t6 : ff6000000181fa00\\n[    6.865561] status: 0000000000000120 badaddr: 0000000000000020 cause: 000000000000000d\\n[    6.868046] [\u003cffffffff8008dc94\u003e] timens_commit+0x38/0x11a\\n[    6.869089] [\u003cffffffff8008dde8\u003e] timens_on_fork+0x72/0xb4\\n[    6.870055] [\u003cffffffff80190096\u003e] begin_new_exec+0x3c6/0x9f0\\n[    6.871231] [\u003cffffffff801d826c\u003e] load_elf_binary+0x628/0x1214\\n[    6.872304] [\u003cffffffff8018ee7a\u003e] bprm_execve+0x1f2/0x4e4\\n[    6.873243] [\u003cffffffff8018f90c\u003e] do_execveat_common+0x16e/0x1ee\\n[    6.874258] [\u003cffffffff8018f9c8\u003e] sys_execve+0x3c/0x48\\n[    6.875162] [\u003cffffffff80003556\u003e] ret_from_syscall+0x0/0x2\\n[    6.877484] ---[ end trace 0000000000000000 ]---\\n\\nThis is because the mm-\u003econtext.vdso_info is NULL in vfork case. From\\nanother side, mm-\u003econtext.vdso_info either points to vdso info\\nfor RV64 or vdso info for compat, there\u0027s no need to bloat riscv\u0027s\\nmm_context_t, we can handle the difference when setup the additional\\npage for vdso.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/a8616d2dc193b6becc36b5f3cfeaa9ac7a5762f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df30c4feba51beeb138f3518c2421abc8cbda3c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f2419a6fbb4caf8cf3fe0ac7e4cf2e28127d04b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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