CVE-2026-80809 (GCVE-0-2026-80809)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-10-19 08:44
VLAI
Title
ocfs2: fix missing metadata reservation for large xattrs
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix missing metadata reservation for large xattrs [BUG] lsetxattr() panics the kernel when setting a large xattr value on a fragmented filesystem where the file already has an external xattr block. [CAUSE] ocfs2_calc_xattr_set_need() never reserves metadata blocks for a new xattr value's extent tree when the file already has an external xattr block. The not_found path leaves meta_add at zero, so meta_ac is NULL when ocfs2_xattr_extend_allocation() runs. A new value root has room for a single extent record. On a fragmented filesystem, the allocator cannot satisfy the xattr value in one contiguous run, so each non-contiguous run requires its own extent record. When the value root's extent list is full and meta_ac is NULL, ocfs2_add_clusters_in_btree() returns RESTART_META, and ocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META). [FIX] The case where no xattr block exists yet already calls ocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree metadata. Add the same reservation to the case where an xattr block already exists, making the two cases consistent. Replace the BUG_ON with a -ENOSPC return so that if RESTART_META is returned despite the reservation, the error propagates to userspace instead of panicking the kernel.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < 743ac908282ac97ef6e73ac3a92df2cc8ecb7479 (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < 04ba24bce61c917b5b3009f0db470cbb72e26a0d (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < b4663405ae29d36011cd712d243456f3f9ab700d (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < 6a009f1e61b11d9e23d3c5aa1dacfb010945da45 (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < 6176313622e34fa3e2b66b9d0682d1e1c6b365c5 (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < a3ccb57086dd7652d5ecb826486144198a98a8e9 (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f (git)
Affected: a78f9f4668949a6588b8872f162e86685c63d023 , < 0cdc7dde00ec63ac714271fa8b2918d630b8da1a (git)
Affected: 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0 (git)
Affected: 2.6.34.2 , < 2.6.35 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix missing metadata reservation for large xattrs\n\n[BUG]\nlsetxattr() panics the kernel when setting a large xattr value on a\nfragmented filesystem where the file already has an external xattr\nblock.\n\n[CAUSE]\nocfs2_calc_xattr_set_need() never reserves metadata blocks for a new\nxattr value\u0027s extent tree when the file already has an external xattr\nblock. The not_found path leaves meta_add at zero, so meta_ac is NULL\nwhen ocfs2_xattr_extend_allocation() runs.\n\nA new value root has room for a single extent record. On a fragmented\nfilesystem, the allocator cannot satisfy the xattr value in one\ncontiguous run, so each non-contiguous run requires its own extent\nrecord. When the value root\u0027s extent list is full and meta_ac is NULL,\nocfs2_add_clusters_in_btree() returns RESTART_META, and\nocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META).\n\n[FIX]\nThe case where no xattr block exists yet already calls\nocfs2_extend_meta_needed(\u0026def_xv.xv.xr_list) to reserve value tree\nmetadata. Add the same reservation to the case where an xattr block\nalready exists, making the two cases consistent.\n\nReplace the BUG_ON with a -ENOSPC return so that if RESTART_META is\nreturned despite the reservation, the error propagates to userspace\ninstead of panicking the kernel."
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    "dateReserved": "2026-08-26T14:34:25.794Z",
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      "cve": "CVE-2026-80809",
      "id": "msrc_CVE-2026-80809",
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      "title": "ocfs2: fix missing metadata reservation for large xattrs",
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix missing metadata reservation for large xattrs\n\n[BUG]\nlsetxattr() panics the kernel when setting a large xattr value on a\nfragmented filesystem where the file already has an external xattr\nblock.\n\n[CAUSE]\nocfs2_calc_xattr_set_need() never reserves metadata blocks for a new\nxattr value\u0027s extent tree when the file already has an external xattr\nblock. The not_found path leaves meta_add at zero, so meta_ac is NULL\nwhen ocfs2_xattr_extend_allocation() runs.\n\nA new value root has room for a single extent record. On a fragmented\nfilesystem, the allocator cannot satisfy the xattr value in one\ncontiguous run, so each non-contiguous run requires its own extent\nrecord. When the value root\u0027s extent list is full and meta_ac is NULL,\nocfs2_add_clusters_in_btree() returns RESTART_META, and\nocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META).\n\n[FIX]\nThe case where no xattr block exists yet already calls\nocfs2_extend_meta_needed(\u0026def_xv.xv.xr_list) to reserve value tree\nmetadata. Add the same reservation to the case where an xattr block\nalready exists, making the two cases consistent.\n\nReplace the BUG_ON with a -ENOSPC return so that if RESTART_META is\nreturned despite the reservation, the error propagates to userspace\ninstead of panicking the kernel."
          }
        ],
        "id": "CVE-2026-80809",
        "lastModified": "2026-10-19T09:17:15.673",
        "metrics": {},
        "published": "2026-09-04T16:18:08.190",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/743ac908282ac97ef6e73ac3a92df2cc8ecb7479"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a3ccb57086dd7652d5ecb826486144198a98a8e9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b4663405ae29d36011cd712d243456f3f9ab700d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T01:03:51Z",
      "cve": "CVE-2026-80809",
      "id": "CVE-2026-80809",
      "initial_release_date": "2026-09-05T00:26:59Z",
      "product_status:known_affected": "344",
      "product_status:recommended": "69",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80809",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-80809.json",
      "version": "10"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.