CVE-2022-50631 (GCVE-0-2022-50631)

Vulnerability from cvelistv5 – Published: 2025-12-08 23:59 – Updated: 2025-12-08 23:59
VLAI?
Title
RISC-V: kexec: Fix memory leak of fdt buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: RISC-V: kexec: Fix memory leak of fdt buffer This is reported by kmemleak detector: unreferenced object 0xff60000082864000 (size 9588): comm "kexec", pid 146, jiffies 4294900634 (age 64.788s) hex dump (first 32 bytes): d0 0d fe ed 00 00 12 ed 00 00 00 48 00 00 11 40 ...........H...@ 00 00 00 28 00 00 00 11 00 00 00 02 00 00 00 00 ...(............ backtrace: [<00000000f95b17c4>] kmemleak_alloc+0x34/0x3e [<00000000b9ec8e3e>] kmalloc_order+0x9c/0xc4 [<00000000a95cf02e>] kmalloc_order_trace+0x34/0xb6 [<00000000f01e68b4>] __kmalloc+0x5c2/0x62a [<000000002bd497b2>] kvmalloc_node+0x66/0xd6 [<00000000906542fa>] of_kexec_alloc_and_setup_fdt+0xa6/0x6ea [<00000000e1166bde>] elf_kexec_load+0x206/0x4ec [<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 kvmalloc() to store fdt. While it's not freed back to system when kexec kernel is reloaded or unloaded. Then memory leak is caused. Fix it by introducing riscv specific function arch_kimage_file_post_load_cleanup(), and freeing the buffer there.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6261586e0c91db14c34f894f4bc48f2300cff1d4 , < c66ad198b6497dee8f45d7ed5c03629c4525c7d0 (git)
Affected: 6261586e0c91db14c34f894f4bc48f2300cff1d4 , < dc387c34d8dd10b02a333df098f8fd9bba177a45 (git)
Affected: 6261586e0c91db14c34f894f4bc48f2300cff1d4 , < 96df59b1ae23f5c11698c3c2159aeb2ecd4944a4 (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/include/asm/kexec.h",
            "arch/riscv/kernel/elf_kexec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6261586e0c91db14c34f894f4bc48f2300cff1d4",
              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
              "version": "6261586e0c91db14c34f894f4bc48f2300cff1d4",
              "versionType": "git"
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        {
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          "product": "Linux",
          "programFiles": [
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            "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"
            },
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              "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": [
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          "nodes": [
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              "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 fdt buffer\n\nThis is reported by kmemleak detector:\n\nunreferenced object 0xff60000082864000 (size 9588):\n  comm \"kexec\", pid 146, jiffies 4294900634 (age 64.788s)\n  hex dump (first 32 bytes):\n    d0 0d fe ed 00 00 12 ed 00 00 00 48 00 00 11 40  ...........H...@\n    00 00 00 28 00 00 00 11 00 00 00 02 00 00 00 00  ...(............\n  backtrace:\n    [\u003c00000000f95b17c4\u003e] kmemleak_alloc+0x34/0x3e\n    [\u003c00000000b9ec8e3e\u003e] kmalloc_order+0x9c/0xc4\n    [\u003c00000000a95cf02e\u003e] kmalloc_order_trace+0x34/0xb6\n    [\u003c00000000f01e68b4\u003e] __kmalloc+0x5c2/0x62a\n    [\u003c000000002bd497b2\u003e] kvmalloc_node+0x66/0xd6\n    [\u003c00000000906542fa\u003e] of_kexec_alloc_and_setup_fdt+0xa6/0x6ea\n    [\u003c00000000e1166bde\u003e] elf_kexec_load+0x206/0x4ec\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 kvmalloc() to store fdt.\nWhile it\u0027s not freed back to system when kexec kernel is reloaded or\nunloaded.  Then memory leak is caused.  Fix it by introducing riscv\nspecific function arch_kimage_file_post_load_cleanup(), and freeing the\nbuffer there."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-08T23:59:57.228Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c66ad198b6497dee8f45d7ed5c03629c4525c7d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc387c34d8dd10b02a333df098f8fd9bba177a45"
        },
        {
          "url": "https://git.kernel.org/stable/c/96df59b1ae23f5c11698c3c2159aeb2ecd4944a4"
        }
      ],
      "title": "RISC-V: kexec: Fix memory leak of fdt buffer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50631",
    "datePublished": "2025-12-08T23:59:57.228Z",
    "dateReserved": "2025-12-08T23:57:43.369Z",
    "dateUpdated": "2025-12-08T23:59:57.228Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50631\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T01:16:44.490\",\"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\\nRISC-V: kexec: Fix memory leak of fdt buffer\\n\\nThis is reported by kmemleak detector:\\n\\nunreferenced object 0xff60000082864000 (size 9588):\\n  comm \\\"kexec\\\", pid 146, jiffies 4294900634 (age 64.788s)\\n  hex dump (first 32 bytes):\\n    d0 0d fe ed 00 00 12 ed 00 00 00 48 00 00 11 40  ...........H...@\\n    00 00 00 28 00 00 00 11 00 00 00 02 00 00 00 00  ...(............\\n  backtrace:\\n    [\u003c00000000f95b17c4\u003e] kmemleak_alloc+0x34/0x3e\\n    [\u003c00000000b9ec8e3e\u003e] kmalloc_order+0x9c/0xc4\\n    [\u003c00000000a95cf02e\u003e] kmalloc_order_trace+0x34/0xb6\\n    [\u003c00000000f01e68b4\u003e] __kmalloc+0x5c2/0x62a\\n    [\u003c000000002bd497b2\u003e] kvmalloc_node+0x66/0xd6\\n    [\u003c00000000906542fa\u003e] of_kexec_alloc_and_setup_fdt+0xa6/0x6ea\\n    [\u003c00000000e1166bde\u003e] elf_kexec_load+0x206/0x4ec\\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 kvmalloc() to store fdt.\\nWhile it\u0027s not freed back to system when kexec kernel is reloaded or\\nunloaded.  Then memory leak is caused.  Fix it by introducing riscv\\nspecific function arch_kimage_file_post_load_cleanup(), and freeing the\\nbuffer there.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/96df59b1ae23f5c11698c3c2159aeb2ecd4944a4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c66ad198b6497dee8f45d7ed5c03629c4525c7d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc387c34d8dd10b02a333df098f8fd9bba177a45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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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