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FKIE_CVE-2026-74319

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
Summary
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. In btrfs_alloc_data_chunk_ondemand(), select this new flush state when the inode belongs to a data relocation root on a zoned filesystem.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/delalloc-space.c",
            "fs/btrfs/space-info.c",
            "fs/btrfs/space-info.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f84dbbaa988e1344634a20ddf6c7d51a99f12477",
              "status": "affected",
              "version": "e2a7fd22378f6500bcf979edc71e6837271eacfd",
              "versionType": "git"
            },
            {
              "lessThan": "814c3b4ea357297c507158bceb07bcdc5fbe9808",
              "status": "affected",
              "version": "e2a7fd22378f6500bcf979edc71e6837271eacfd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/delalloc-space.c",
            "fs/btrfs/space-info.c",
            "fs/btrfs/space-info.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-74319",
  "lastModified": "2026-08-17T06:19:26.320",
  "metrics": {},
  "published": "2026-08-15T06:22:32.333",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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