« Volver al listado

CVE-2023-53231

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

erofs: Fix detection of atomic context

Current check for atomic context is not sufficient as z_erofs_decompressqueue_endio can be called under rcu lock from blk_mq_flush_plug_list(). See the stacktrace [1]

In such case we should hand off the decompression work for async processing rather than trying to do sync decompression in current context. Patch fixes the detection by checking for rcu_read_lock_any_held() and while at it use more appropriate !in_task() check than in_atomic().

Background: Historically erofs would always schedule a kworker for decompression which would incur the scheduling cost regardless of the context.

Leer descripción completaMostrar menos

But z_erofs_decompressqueue_endio() may not always be in atomic context and we could actually benefit from doing the decompression in z_erofs_decompressqueue_endio() if we are in thread context, for example when running with dm-verity. This optimization was later added in patch [2] which has shown improvement in performance benchmarks.

[2] Link: https://lore.kernel.org/all/20210317035448.13921-1-huangjianan@oppo.com/

Detalles técnicos trazas, registros y código del informe original
==============================================
[1] Problem stacktrace
[name:core&]BUG: sleeping function called from invalid context at kernel/locking/mutex.c:291
[name:core&]in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1615, name: CpuMonitorServi
[name:core&]preempt_count: 0, expected: 0
[name:core&]RCU nest depth: 1, expected: 0
CPU: 7 PID: 1615 Comm: CpuMonitorServi Tainted: G S      W  OE      6.1.25-android14-5-maybe-dirty-mainline #1
Hardware name: MT6897 (DT)
Call trace:
 dump_backtrace+0x108/0x15c
 show_stack+0x20/0x30
 dump_stack_lvl+0x6c/0x8c
 dump_stack+0x20/0x48
 __might_resched+0x1fc/0x308
 __might_sleep+0x50/0x88
 mutex_lock+0x2c/0x110
 z_erofs_decompress_queue+0x11c/0xc10
 z_erofs_decompress_kickoff+0x110/0x1a4
 z_erofs_decompressqueue_endio+0x154/0x180
 bio_endio+0x1b0/0x1d8
 __dm_io_complete+0x22c/0x280
 clone_endio+0xe4/0x280
 bio_endio+0x1b0/0x1d8
 blk_update_request+0x138/0x3a4
 blk_mq_plug_issue_direct+0xd4/0x19c
 blk_mq_flush_plug_list+0x2b0/0x354
 __blk_flush_plug+0x110/0x160
 blk_finish_plug+0x30/0x4c
 read_pages+0x2fc/0x370
 page_cache_ra_unbounded+0xa4/0x23c
 page_cache_ra_order+0x290/0x320
 do_sync_mmap_readahead+0x108/0x2c0
 filemap_fault+0x19c/0x52c
 __do_fault+0xc4/0x114
 handle_mm_fault+0x5b4/0x1168
 do_page_fault+0x338/0x4b4
 do_translation_fault+0x40/0x60
 do_mem_abort+0x60/0xc8
 el0_da+0x4c/0xe0
 el0t_64_sync_handler+0xd4/0xfc
 el0t_64_sync+0x1a0/0x1a4

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2023-53231",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-53231",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-14T17:55:25.324929Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      },
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "aea1286dcbbb87cf33595c2ac8b153c29a4611cb",
              "lessThan": "c3446e50fb4dc39e2dfb5951a57bc175d38f68be",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea1286dcbbb87cf33595c2ac8b153c29a4611cb",
              "lessThan": "96bcd9650e15901201d964eef5f79d18a81daac8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea1286dcbbb87cf33595c2ac8b153c29a4611cb",
              "lessThan": "597fb60c75132719687e173b75cab8f6eb1ca657",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea1286dcbbb87cf33595c2ac8b153c29a4611cb",
              "lessThan": "12d0a24afd9ea58e581ea64d64e066f2027b28d9",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.4.7",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/erofs/zdata.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-09-15T15:15:50.063",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/12d0a24afd9ea58e581ea64d64e066f2027b28d9",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/597fb60c75132719687e173b75cab8f6eb1ca657",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/96bcd9650e15901201d964eef5f79d18a81daac8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c3446e50fb4dc39e2dfb5951a57bc175d38f68be",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix detection of atomic context\n\nCurrent check for atomic context is not sufficient as\nz_erofs_decompressqueue_endio can be called under rcu lock\nfrom blk_mq_flush_plug_list(). See the stacktrace [1]\n\nIn such case we should hand off the decompression work for async\nprocessing rather than trying to do sync decompression in current\ncontext. Patch fixes the detection by checking for\nrcu_read_lock_any_held() and while at it use more appropriate\n!in_task() check than in_atomic().\n\nBackground: Historically erofs would always schedule a kworker for\ndecompression which would incur the scheduling cost regardless of\nthe context. But z_erofs_decompressqueue_endio() may not always\nbe in atomic context and we could actually benefit from doing the\ndecompression in z_erofs_decompressqueue_endio() if we are in\nthread context, for example when running with dm-verity.\nThis optimization was later added in patch [2] which has shown\nimprovement in performance benchmarks.\n\n==============================================\n[1] Problem stacktrace\n[name:core&]BUG: sleeping function called from invalid context at kernel/locking/mutex.c:291\n[name:core&]in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1615, name: CpuMonitorServi\n[name:core&]preempt_count: 0, expected: 0\n[name:core&]RCU nest depth: 1, expected: 0\nCPU: 7 PID: 1615 Comm: CpuMonitorServi Tainted: G S      W  OE      6.1.25-android14-5-maybe-dirty-mainline #1\nHardware name: MT6897 (DT)\nCall trace:\n dump_backtrace+0x108/0x15c\n show_stack+0x20/0x30\n dump_stack_lvl+0x6c/0x8c\n dump_stack+0x20/0x48\n __might_resched+0x1fc/0x308\n __might_sleep+0x50/0x88\n mutex_lock+0x2c/0x110\n z_erofs_decompress_queue+0x11c/0xc10\n z_erofs_decompress_kickoff+0x110/0x1a4\n z_erofs_decompressqueue_endio+0x154/0x180\n bio_endio+0x1b0/0x1d8\n __dm_io_complete+0x22c/0x280\n clone_endio+0xe4/0x280\n bio_endio+0x1b0/0x1d8\n blk_update_request+0x138/0x3a4\n blk_mq_plug_issue_direct+0xd4/0x19c\n blk_mq_flush_plug_list+0x2b0/0x354\n __blk_flush_plug+0x110/0x160\n blk_finish_plug+0x30/0x4c\n read_pages+0x2fc/0x370\n page_cache_ra_unbounded+0xa4/0x23c\n page_cache_ra_order+0x290/0x320\n do_sync_mmap_readahead+0x108/0x2c0\n filemap_fault+0x19c/0x52c\n __do_fault+0xc4/0x114\n handle_mm_fault+0x5b4/0x1168\n do_page_fault+0x338/0x4b4\n do_translation_fault+0x40/0x60\n do_mem_abort+0x60/0xc8\n el0_da+0x4c/0xe0\n el0t_64_sync_handler+0xd4/0xfc\n el0t_64_sync+0x1a0/0x1a4\n\n[2] Link: https://lore.kernel.org/all/20210317035448.13921-1-huangjianan@oppo.com/"
    }
  ],
  "lastModified": "2026-10-03T11:17:27.190",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "512FE1EE-BE65-45A5-B4D8-6442A202F5A6",
              "versionEndExcluding": "6.4.7",
              "versionStartIncluding": "4.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}