GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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)
guessed Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74319",
      "date": "2026-09-04",
      "epss": "0.00155",
      "percentile": "0.05008"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74319\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:32.333\",\"lastModified\":\"2026-08-17T06:19:26.320\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"version\":\"e2a7fd22378f6500bcf979edc71e6837271eacfd\",\"lessThan\":\"f84dbbaa988e1344634a20ddf6c7d51a99f12477\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e2a7fd22378f6500bcf979edc71e6837271eacfd\",\"lessThan\":\"814c3b4ea357297c507158bceb07bcdc5fbe9808\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"7.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"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\"}]}}",
    "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"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.