CVE-2026-74319 (GCVE-0-2026-74319)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:17
VLAI
Title
btrfs: zoned: fix deadlock waiting for ticket during data relocation
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2a7fd22378f6500bcf979edc71e6837271eacfd , < f84dbbaa988e1344634a20ddf6c7d51a99f12477 (git)
Affected: e2a7fd22378f6500bcf979edc71e6837271eacfd , < 814c3b4ea357297c507158bceb07bcdc5fbe9808 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/delalloc-space.c",
            "fs/btrfs/space-info.c",
            "fs/btrfs/space-info.h"
          ],
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          "versions": [
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              "operator": "OR"
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:17:09.243Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f84dbbaa988e1344634a20ddf6c7d51a99f12477"
        },
        {
          "url": "https://git.kernel.org/stable/c/814c3b4ea357297c507158bceb07bcdc5fbe9808"
        }
      ],
      "title": "btrfs: zoned: fix deadlock waiting for ticket during data relocation",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74319",
    "datePublished": "2026-08-15T05:58:16.142Z",
    "dateReserved": "2026-08-15T05:44:03.884Z",
    "dateUpdated": "2026-08-17T05:17:09.243Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-21",
      "epss": "0.00155",
      "percentile": "0.05102"
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    "nvd": {
      "cve": {
        "affected": [
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                "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": [
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                    "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": [
                  {
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                    "version": "7.1"
                  },
                  {
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                    "version": "0",
                    "versionType": "semver"
                  },
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                  },
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                  }
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              }
            ],
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          }
        ],
        "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"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T09:53:23+00:00",
      "cve": "CVE-2026-74319",
      "id": "CVE-2026-74319",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: zoned: fix deadlock waiting for ticket during data relocation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74319.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T00:58:57Z",
      "cve": "CVE-2026-74319",
      "id": "CVE-2026-74319",
      "initial_release_date": "2026-08-28T00:58:57Z",
      "product_status:known_not_affected": "290",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74319",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74319.json",
      "version": "2"
    }
  }
}



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