CVE-2022-50765 (GCVE-0-2022-50765)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:05 – Updated: 2025-12-24 13:05
VLAI?
Title
RISC-V: kexec: Fix memory leak of elf header buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: RISC-V: kexec: Fix memory leak of elf header buffer This is reported by kmemleak detector: unreferenced object 0xff2000000403d000 (size 4096): comm "kexec", pid 146, jiffies 4294900633 (age 64.792s) hex dump (first 32 bytes): 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 .ELF............ 04 00 f3 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000566ca97c>] kmemleak_vmalloc+0x3c/0xbe [<00000000979283d8>] __vmalloc_node_range+0x3ac/0x560 [<00000000b4b3712a>] __vmalloc_node+0x56/0x62 [<00000000854f75e2>] vzalloc+0x2c/0x34 [<00000000e9a00db9>] crash_prepare_elf64_headers+0x80/0x30c [<0000000067e8bf48>] elf_kexec_load+0x3e8/0x4ec [<0000000036548e09>] kexec_image_load_default+0x40/0x4c [<0000000079fbe1b4>] sys_kexec_file_load+0x1c4/0x322 [<0000000040c62c03>] ret_from_syscall+0x0/0x2 In elf_kexec_load(), a buffer is allocated via vzalloc() to store elf headers. While it's not freed back to system when kdump kernel is reloaded or unloaded, or when image->elf_header is successfully set and then fails to load kdump kernel for some reason. Fix it by freeing the buffer in arch_kimage_file_post_load_cleanup().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8acea455fafaf2620b247de6c00774828b618a82 , < 090bfcfc9f14d05154893c67eeaecc56e894fbae (git)
Affected: 8acea455fafaf2620b247de6c00774828b618a82 , < cdea2da6787583ecca43594132533a2ac8d7cd21 (git)
Affected: 8acea455fafaf2620b247de6c00774828b618a82 , < cbc32023ddbdf4baa3d9dc513a2184a84080a5a2 (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.0.18 , ≤ 6.0.* (semver)
Unaffected: 6.1.4 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kernel/elf_kexec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "090bfcfc9f14d05154893c67eeaecc56e894fbae",
              "status": "affected",
              "version": "8acea455fafaf2620b247de6c00774828b618a82",
              "versionType": "git"
            },
            {
              "lessThan": "cdea2da6787583ecca43594132533a2ac8d7cd21",
              "status": "affected",
              "version": "8acea455fafaf2620b247de6c00774828b618a82",
              "versionType": "git"
            },
            {
              "lessThan": "cbc32023ddbdf4baa3d9dc513a2184a84080a5a2",
              "status": "affected",
              "version": "8acea455fafaf2620b247de6c00774828b618a82",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kernel/elf_kexec.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": "6.0.*",
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.18",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.4",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: kexec: Fix memory leak of elf header buffer\n\nThis is reported by kmemleak detector:\n\nunreferenced object 0xff2000000403d000 (size 4096):\n  comm \"kexec\", pid 146, jiffies 4294900633 (age 64.792s)\n  hex dump (first 32 bytes):\n    7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00  .ELF............\n    04 00 f3 00 01 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [\u003c00000000566ca97c\u003e] kmemleak_vmalloc+0x3c/0xbe\n    [\u003c00000000979283d8\u003e] __vmalloc_node_range+0x3ac/0x560\n    [\u003c00000000b4b3712a\u003e] __vmalloc_node+0x56/0x62\n    [\u003c00000000854f75e2\u003e] vzalloc+0x2c/0x34\n    [\u003c00000000e9a00db9\u003e] crash_prepare_elf64_headers+0x80/0x30c\n    [\u003c0000000067e8bf48\u003e] elf_kexec_load+0x3e8/0x4ec\n    [\u003c0000000036548e09\u003e] kexec_image_load_default+0x40/0x4c\n    [\u003c0000000079fbe1b4\u003e] sys_kexec_file_load+0x1c4/0x322\n    [\u003c0000000040c62c03\u003e] ret_from_syscall+0x0/0x2\n\nIn elf_kexec_load(), a buffer is allocated via vzalloc() to store elf\nheaders.  While it\u0027s not freed back to system when kdump kernel is\nreloaded or unloaded, or when image-\u003eelf_header is successfully set and\nthen fails to load kdump kernel for some reason. Fix it by freeing the\nbuffer in arch_kimage_file_post_load_cleanup()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:05:56.123Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/090bfcfc9f14d05154893c67eeaecc56e894fbae"
        },
        {
          "url": "https://git.kernel.org/stable/c/cdea2da6787583ecca43594132533a2ac8d7cd21"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbc32023ddbdf4baa3d9dc513a2184a84080a5a2"
        }
      ],
      "title": "RISC-V: kexec: Fix memory leak of elf header buffer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50765",
    "datePublished": "2025-12-24T13:05:56.123Z",
    "dateReserved": "2025-12-24T13:02:21.546Z",
    "dateUpdated": "2025-12-24T13:05:56.123Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50765\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:03.297\",\"lastModified\":\"2025-12-24T13:16:03.297\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRISC-V: kexec: Fix memory leak of elf header buffer\\n\\nThis is reported by kmemleak detector:\\n\\nunreferenced object 0xff2000000403d000 (size 4096):\\n  comm \\\"kexec\\\", pid 146, jiffies 4294900633 (age 64.792s)\\n  hex dump (first 32 bytes):\\n    7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00  .ELF............\\n    04 00 f3 00 01 00 00 00 00 00 00 00 00 00 00 00  ................\\n  backtrace:\\n    [\u003c00000000566ca97c\u003e] kmemleak_vmalloc+0x3c/0xbe\\n    [\u003c00000000979283d8\u003e] __vmalloc_node_range+0x3ac/0x560\\n    [\u003c00000000b4b3712a\u003e] __vmalloc_node+0x56/0x62\\n    [\u003c00000000854f75e2\u003e] vzalloc+0x2c/0x34\\n    [\u003c00000000e9a00db9\u003e] crash_prepare_elf64_headers+0x80/0x30c\\n    [\u003c0000000067e8bf48\u003e] elf_kexec_load+0x3e8/0x4ec\\n    [\u003c0000000036548e09\u003e] kexec_image_load_default+0x40/0x4c\\n    [\u003c0000000079fbe1b4\u003e] sys_kexec_file_load+0x1c4/0x322\\n    [\u003c0000000040c62c03\u003e] ret_from_syscall+0x0/0x2\\n\\nIn elf_kexec_load(), a buffer is allocated via vzalloc() to store elf\\nheaders.  While it\u0027s not freed back to system when kdump kernel is\\nreloaded or unloaded, or when image-\u003eelf_header is successfully set and\\nthen fails to load kdump kernel for some reason. Fix it by freeing the\\nbuffer in arch_kimage_file_post_load_cleanup().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/090bfcfc9f14d05154893c67eeaecc56e894fbae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cbc32023ddbdf4baa3d9dc513a2184a84080a5a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cdea2da6787583ecca43594132533a2ac8d7cd21\",\"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.
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  • 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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