CVE-2025-68198 (GCVE-0-2025-68198)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:48 – Updated: 2026-05-11 21:48
VLAI
Title
crash: fix crashkernel resource shrink
Summary
In the Linux kernel, the following vulnerability has been resolved: crash: fix crashkernel resource shrink When crashkernel is configured with a high reservation, shrinking its value below the low crashkernel reservation causes two issues: 1. Invalid crashkernel resource objects 2. Kernel crash if crashkernel shrinking is done twice For example, with crashkernel=200M,high, the kernel reserves 200MB of high memory and some default low memory (say 256MB). The reservation appears as: cat /proc/iomem | grep -i crash af000000-beffffff : Crash kernel 433000000-43f7fffff : Crash kernel If crashkernel is then shrunk to 50MB (echo 52428800 > /sys/kernel/kexec_crash_size), /proc/iomem still shows 256MB reserved: af000000-beffffff : Crash kernel Instead, it should show 50MB: af000000-b21fffff : Crash kernel Further shrinking crashkernel to 40MB causes a kernel crash with the following trace (x86): BUG: kernel NULL pointer dereference, address: 0000000000000038 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI <snip...> Call Trace: <TASK> ? __die_body.cold+0x19/0x27 ? page_fault_oops+0x15a/0x2f0 ? search_module_extables+0x19/0x60 ? search_bpf_extables+0x5f/0x80 ? exc_page_fault+0x7e/0x180 ? asm_exc_page_fault+0x26/0x30 ? __release_resource+0xd/0xb0 release_resource+0x26/0x40 __crash_shrink_memory+0xe5/0x110 crash_shrink_memory+0x12a/0x190 kexec_crash_size_store+0x41/0x80 kernfs_fop_write_iter+0x141/0x1f0 vfs_write+0x294/0x460 ksys_write+0x6d/0xf0 <snip...> This happens because __crash_shrink_memory()/kernel/crash_core.c incorrectly updates the crashk_res resource object even when crashk_low_res should be updated. Fix this by ensuring the correct crashkernel resource object is updated when shrinking crashkernel memory.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 16c6006af4d4e70ecef93977a5314409d931020b , < f01f9c348d76d40bf104a94449e3ce4057fdefee (git)
Affected: 16c6006af4d4e70ecef93977a5314409d931020b , < f89c5e7077f63e45e8ba5a77b7cf0803130367e6 (git)
Affected: 16c6006af4d4e70ecef93977a5314409d931020b , < a2bd247f8c6c5ac3f0ba823a2fffd77bb9cdf618 (git)
Affected: 16c6006af4d4e70ecef93977a5314409d931020b , < 00fbff75c5acb4755f06f08bd1071879c63940c5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrash: fix crashkernel resource shrink\n\nWhen crashkernel is configured with a high reservation, shrinking its\nvalue below the low crashkernel reservation causes two issues:\n\n1. Invalid crashkernel resource objects\n2. Kernel crash if crashkernel shrinking is done twice\n\nFor example, with crashkernel=200M,high, the kernel reserves 200MB of high\nmemory and some default low memory (say 256MB).  The reservation appears\nas:\n\ncat /proc/iomem | grep -i crash\naf000000-beffffff : Crash kernel\n433000000-43f7fffff : Crash kernel\n\nIf crashkernel is then shrunk to 50MB (echo 52428800 \u003e\n/sys/kernel/kexec_crash_size), /proc/iomem still shows 256MB reserved:\naf000000-beffffff : Crash kernel\n\nInstead, it should show 50MB:\naf000000-b21fffff : Crash kernel\n\nFurther shrinking crashkernel to 40MB causes a kernel crash with the\nfollowing trace (x86):\n\nBUG: kernel NULL pointer dereference, address: 0000000000000038\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP NOPTI\n\u003csnip...\u003e\nCall Trace: \u003cTASK\u003e\n? __die_body.cold+0x19/0x27\n? page_fault_oops+0x15a/0x2f0\n? search_module_extables+0x19/0x60\n? search_bpf_extables+0x5f/0x80\n? exc_page_fault+0x7e/0x180\n? asm_exc_page_fault+0x26/0x30\n? __release_resource+0xd/0xb0\nrelease_resource+0x26/0x40\n__crash_shrink_memory+0xe5/0x110\ncrash_shrink_memory+0x12a/0x190\nkexec_crash_size_store+0x41/0x80\nkernfs_fop_write_iter+0x141/0x1f0\nvfs_write+0x294/0x460\nksys_write+0x6d/0xf0\n\u003csnip...\u003e\n\nThis happens because __crash_shrink_memory()/kernel/crash_core.c\nincorrectly updates the crashk_res resource object even when\ncrashk_low_res should be updated.\n\nFix this by ensuring the correct crashkernel resource object is updated\nwhen shrinking crashkernel memory."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:48:33.671Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/f01f9c348d76d40bf104a94449e3ce4057fdefee"
        },
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          "url": "https://git.kernel.org/stable/c/f89c5e7077f63e45e8ba5a77b7cf0803130367e6"
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        },
        {
          "url": "https://git.kernel.org/stable/c/00fbff75c5acb4755f06f08bd1071879c63940c5"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68198",
    "datePublished": "2025-12-16T13:48:26.998Z",
    "dateReserved": "2025-12-16T13:41:40.254Z",
    "dateUpdated": "2026-05-11T21:48:33.671Z",
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      "percentile": "0.09675"
    },
    "microsoft_vex": {
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      "cve": "CVE-2025-68198",
      "id": "msrc_CVE-2025-68198",
      "initial_release_date": "2025-12-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "crash: fix crashkernel resource shrink",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-68198.json",
      "version": "2"
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    "nvd": {
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                "product": "Linux",
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                    "versionType": "git"
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                "vendor": "Linux",
                "versions": [
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                    "status": "affected",
                    "version": "6.5"
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                    "version": "0",
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                    "versionType": "semver"
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                  {
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrash: fix crashkernel resource shrink\n\nWhen crashkernel is configured with a high reservation, shrinking its\nvalue below the low crashkernel reservation causes two issues:\n\n1. Invalid crashkernel resource objects\n2. Kernel crash if crashkernel shrinking is done twice\n\nFor example, with crashkernel=200M,high, the kernel reserves 200MB of high\nmemory and some default low memory (say 256MB).  The reservation appears\nas:\n\ncat /proc/iomem | grep -i crash\naf000000-beffffff : Crash kernel\n433000000-43f7fffff : Crash kernel\n\nIf crashkernel is then shrunk to 50MB (echo 52428800 \u003e\n/sys/kernel/kexec_crash_size), /proc/iomem still shows 256MB reserved:\naf000000-beffffff : Crash kernel\n\nInstead, it should show 50MB:\naf000000-b21fffff : Crash kernel\n\nFurther shrinking crashkernel to 40MB causes a kernel crash with the\nfollowing trace (x86):\n\nBUG: kernel NULL pointer dereference, address: 0000000000000038\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP NOPTI\n\u003csnip...\u003e\nCall Trace: \u003cTASK\u003e\n? __die_body.cold+0x19/0x27\n? page_fault_oops+0x15a/0x2f0\n? search_module_extables+0x19/0x60\n? search_bpf_extables+0x5f/0x80\n? exc_page_fault+0x7e/0x180\n? asm_exc_page_fault+0x26/0x30\n? __release_resource+0xd/0xb0\nrelease_resource+0x26/0x40\n__crash_shrink_memory+0xe5/0x110\ncrash_shrink_memory+0x12a/0x190\nkexec_crash_size_store+0x41/0x80\nkernfs_fop_write_iter+0x141/0x1f0\nvfs_write+0x294/0x460\nksys_write+0x6d/0xf0\n\u003csnip...\u003e\n\nThis happens because __crash_shrink_memory()/kernel/crash_core.c\nincorrectly updates the crashk_res resource object even when\ncrashk_low_res should be updated.\n\nFix this by ensuring the correct crashkernel resource object is updated\nwhen shrinking crashkernel memory."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrash: corrige la reducci\u00f3n del recurso crashkernel\n\nCuando crashkernel se configura con una reserva alta, reducir su valor por debajo de la reserva baja de crashkernel causa dos problemas:\n\n1. Objetos de recurso crashkernel no v\u00e1lidos\n2. Ca\u00edda del kernel si la reducci\u00f3n de crashkernel se realiza dos veces\n\nPor ejemplo, con crashkernel=200M,high, el kernel reserva 200MB de memoria alta y algo de memoria baja predeterminada (por ejemplo, 256MB). La reserva aparece como:\n\ncat /proc/iomem | grep -i crash\naf000000-beffffff : Crash kernel\n433000000-43f7fffff : Crash kernel\n\nSi crashkernel se reduce luego a 50MB (echo 52428800 \u003e /sys/kernel/kexec_crash_size), /proc/iomem todav\u00eda muestra 256MB reservados:\naf000000-beffffff : Crash kernel\n\nEn su lugar, deber\u00eda mostrar 50MB:\naf000000-b21fffff : Crash kernel\n\nReducir a\u00fan m\u00e1s crashkernel a 40MB causa una ca\u00edda del kernel con el siguiente rastreo (x86):\n\nBUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000038\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP NOPTI\n\u003csnip...\u003e\nRastreo de Llamadas: \u003cTASK\u003e\n? __die_body.cold+0x19/0x27\n? page_fault_oops+0x15a/0x2f0\n? search_module_extables+0x19/0x60\n? search_bpf_extables+0x5f/0x80\n? exc_page_fault+0x7e/0x180\n? asm_exc_page_fault+0x26/0x30\n? __release_resource+0xd/0xb0\nrelease_resource+0x26/0x40\n__crash_shrink_memory+0xe5/0x110\ncrash_shrink_memory+0x12a/0x190\nkexec_crash_size_store+0x41/0x80\nkernfs_fop_write_iter+0x141/0x1f0\nvfs_write+0x294/0x460\nksys_write+0x6d/0xf0\n\u003csnip...\u003e\n\nEsto sucede porque __crash_shrink_memory()/kernel/crash_core.c actualiza incorrectamente el objeto de recurso crashk_res incluso cuando crashk_low_res deber\u00eda ser actualizado.\n\nSolucione esto asegurando que el objeto de recurso crashkernel correcto se actualice al reducir la memoria de crashkernel."
          }
        ],
        "id": "CVE-2025-68198",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2025-12-16T14:15:52.590",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/00fbff75c5acb4755f06f08bd1071879c63940c5"
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            "url": "https://git.kernel.org/stable/c/f01f9c348d76d40bf104a94449e3ce4057fdefee"
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            "url": "https://git.kernel.org/stable/c/f89c5e7077f63e45e8ba5a77b7cf0803130367e6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:37:09+00:00",
      "cve": "CVE-2025-68198",
      "id": "CVE-2025-68198",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crash: fix crashkernel resource shrink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68198.json",
      "version": "3"
    }
  }
}



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