CVE-2025-68322 (GCVE-0-2025-68322)
Vulnerability from cvelistv5
Published
2025-12-16 15:44
Modified
2026-01-02 15:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: parisc: Avoid crash due to unaligned access in unwinder Guenter Roeck reported this kernel crash on his emulated B160L machine: Starting network: udhcpc: started, v1.36.1 Backtrace: [<104320d4>] unwind_once+0x1c/0x5c [<10434a00>] walk_stackframe.isra.0+0x74/0xb8 [<10434a6c>] arch_stack_walk+0x28/0x38 [<104e5efc>] stack_trace_save+0x48/0x5c [<105d1bdc>] set_track_prepare+0x44/0x6c [<105d9c80>] ___slab_alloc+0xfc4/0x1024 [<105d9d38>] __slab_alloc.isra.0+0x58/0x90 [<105dc80c>] kmem_cache_alloc_noprof+0x2ac/0x4a0 [<105b8e54>] __anon_vma_prepare+0x60/0x280 [<105a823c>] __vmf_anon_prepare+0x68/0x94 [<105a8b34>] do_wp_page+0x8cc/0xf10 [<105aad88>] handle_mm_fault+0x6c0/0xf08 [<10425568>] do_page_fault+0x110/0x440 [<10427938>] handle_interruption+0x184/0x748 [<11178398>] schedule+0x4c/0x190 BUG: spinlock recursion on CPU#0, ifconfig/2420 lock: terminate_lock.2+0x0/0x1c, .magic: dead4ead, .owner: ifconfig/2420, .owner_cpu: 0 While creating the stack trace, the unwinder uses the stack pointer to guess the previous frame to read the previous stack pointer from memory. The crash happens, because the unwinder tries to read from unaligned memory and as such triggers the unalignment trap handler which then leads to the spinlock recursion and finally to a deadlock. Fix it by checking the alignment before accessing the memory.
References
Impacted products
Vendor Product Version
Linux Linux Version: c8921d72e390cb6fca3fb2b0c2badfda851647eb
Version: c8921d72e390cb6fca3fb2b0c2badfda851647eb
Version: c8921d72e390cb6fca3fb2b0c2badfda851647eb
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/parisc/kernel/unwind.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9ac1f44723f26881b9fe7e69c7bc25397b879155",
              "status": "affected",
              "version": "c8921d72e390cb6fca3fb2b0c2badfda851647eb",
              "versionType": "git"
            },
            {
              "lessThan": "009270208f76456c2cefcd565da263b90bb2eadb",
              "status": "affected",
              "version": "c8921d72e390cb6fca3fb2b0c2badfda851647eb",
              "versionType": "git"
            },
            {
              "lessThan": "fd9f30d1038ee1624baa17a6ff11effe5f7617cb",
              "status": "affected",
              "version": "c8921d72e390cb6fca3fb2b0c2badfda851647eb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/parisc/kernel/unwind.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.58",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.8",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "4.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Avoid crash due to unaligned access in unwinder\n\nGuenter Roeck reported this kernel crash on his emulated B160L machine:\n\nStarting network: udhcpc: started, v1.36.1\n Backtrace:\n  [\u003c104320d4\u003e] unwind_once+0x1c/0x5c\n  [\u003c10434a00\u003e] walk_stackframe.isra.0+0x74/0xb8\n  [\u003c10434a6c\u003e] arch_stack_walk+0x28/0x38\n  [\u003c104e5efc\u003e] stack_trace_save+0x48/0x5c\n  [\u003c105d1bdc\u003e] set_track_prepare+0x44/0x6c\n  [\u003c105d9c80\u003e] ___slab_alloc+0xfc4/0x1024\n  [\u003c105d9d38\u003e] __slab_alloc.isra.0+0x58/0x90\n  [\u003c105dc80c\u003e] kmem_cache_alloc_noprof+0x2ac/0x4a0\n  [\u003c105b8e54\u003e] __anon_vma_prepare+0x60/0x280\n  [\u003c105a823c\u003e] __vmf_anon_prepare+0x68/0x94\n  [\u003c105a8b34\u003e] do_wp_page+0x8cc/0xf10\n  [\u003c105aad88\u003e] handle_mm_fault+0x6c0/0xf08\n  [\u003c10425568\u003e] do_page_fault+0x110/0x440\n  [\u003c10427938\u003e] handle_interruption+0x184/0x748\n  [\u003c11178398\u003e] schedule+0x4c/0x190\n  BUG: spinlock recursion on CPU#0, ifconfig/2420\n  lock: terminate_lock.2+0x0/0x1c, .magic: dead4ead, .owner: ifconfig/2420, .owner_cpu: 0\n\nWhile creating the stack trace, the unwinder uses the stack pointer to guess\nthe previous frame to read the previous stack pointer from memory.  The crash\nhappens, because the unwinder tries to read from unaligned memory and as such\ntriggers the unalignment trap handler which then leads to the spinlock\nrecursion and finally to a deadlock.\n\nFix it by checking the alignment before accessing the memory."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-02T15:35:07.725Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9ac1f44723f26881b9fe7e69c7bc25397b879155"
        },
        {
          "url": "https://git.kernel.org/stable/c/009270208f76456c2cefcd565da263b90bb2eadb"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd9f30d1038ee1624baa17a6ff11effe5f7617cb"
        }
      ],
      "title": "parisc: Avoid crash due to unaligned access in unwinder",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68322",
    "datePublished": "2025-12-16T15:44:19.850Z",
    "dateReserved": "2025-12-16T14:48:05.296Z",
    "dateUpdated": "2026-01-02T15:35:07.725Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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