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CVE-2026-74319

Estado: RecibidaSin puntuar—

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

btrfs: zoned: fix deadlock waiting for ticket during data relocation

When performing data relocation on a zoned filesystem, BTRFS can deadlock in handle_reserve_tickets(). The relocation process is waiting on a space reservation ticket that can never be fulfilled, because the relocation itself is the operation responsible for freeing up that space.

Fix this by introducing a new flush state, BTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk allocation during zoned relocation. Like BTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses priority_reclaim_data_space() instead of the normal flushing path, which avoids re-entering the relocation code and breaking the deadlock cycle.

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In btrfs_alloc_data_chunk_ondemand(), select this new flush state when the inode belongs to a data relocation root on a zoned filesystem.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-74319",
  "cveTags": [],
  "metrics": {},
  "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": "e2a7fd22378f6500bcf979edc71e6837271eacfd",
              "lessThan": "f84dbbaa988e1344634a20ddf6c7d51a99f12477",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e2a7fd22378f6500bcf979edc71e6837271eacfd",
              "lessThan": "814c3b4ea357297c507158bceb07bcdc5fbe9808",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/delalloc-space.c",
            "fs/btrfs/space-info.c",
            "fs/btrfs/space-info.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/delalloc-space.c",
            "fs/btrfs/space-info.c",
            "fs/btrfs/space-info.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:32.333",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix deadlock waiting for ticket during data relocation\n\nWhen performing data relocation on a zoned filesystem, BTRFS can deadlock\nin handle_reserve_tickets(). The relocation process is waiting on a space\nreservation ticket that can never be fulfilled, because the relocation\nitself is the operation responsible for freeing up that space.\n\nFix this by introducing a new flush state,\nBTRFS_RESERVE_FLUSH_ZONED_RELOCATION, specifically for data chunk\nallocation during zoned relocation. Like\nBTRFS_RESERVE_FLUSH_FREE_SPACE_INODE, this state uses\npriority_reclaim_data_space() instead of the normal flushing path, which\navoids re-entering the relocation code and breaking the deadlock cycle.\n\nIn btrfs_alloc_data_chunk_ondemand(), select this new flush state when the\ninode belongs to a data relocation root on a zoned filesystem."
    }
  ],
  "lastModified": "2026-08-17T06:19:26.320",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}