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CVE-2026-80808 (GCVE-0-2026-80808)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
ext4: stop retrying saturated xattr cache entries
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: stop retrying saturated xattr cache entries ext4_xattr_block_set() retries when a cache entry selected for reuse has a saturated reference count after taking the buffer lock. The retry returns to the mbcache lookup without making that entry ineligible, so it can select the same unusable entry indefinitely. A task spinning there can hold the parent directory's i_rwsem and leave concurrent rmdir callers blocked. Normally a reusable entry has a reference count below EXT4_XATTR_REFCOUNT_MAX because the count and MBE_REUSABLE_B are updated under the same buffer lock. A corrupted filesystem can violate that invariant. The syzbot reproducer reports allocator and xattr corruption before triggering this retry loop. Check the untrusted on-disk count before incrementing it, avoiding overflow, and clear MBE_REUSABLE_B when it is already saturated. The next lookup then skips the entry that was just proven unusable. This mirrors the normal transition at EXT4_XATTR_REFCOUNT_MAX; the release path marks the entry reusable again on the exact 1024-to-1023 transition. Using the same QEMU harness and guest parameters, current unpatched Linux hung in 6 of 8 420-second trials with the do_rmdir signature; representative NMI backtraces caught the owner spinning in ext4_xattr_block_set(). The patched kernel completed 28 of 28 trials without a hung-task report; the final twelve trials exercised the reviewed overflow-safe form of the change. syzbot's patch testing also completed without reproducing the hang.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1a56cd972ce121b6cf2517a47a578782bbd2ec95 , < 119a2f053242ed75bdd2ebc95baf3ae7db6ccacf (git)
Affected: 1be97463696c7291a3e1547614e96432b0bd3add , < 61631352a5b405c89be579de00903b72e6888aa4 (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < 8865cd664484517703df5c18a965dc3227572b87 (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < a40c45268f4358207aa9c53764fed2e05f62986a (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < 889ec86464d261f026f6c334040cfc6c58c99d58 (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < 4902a5cba21aeaf91e6b29e20e0967a5f6abdcd9 (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < 55ee6533c1db7f7656fa8dd19637f3f8b8c08dc5 (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < dbd4aea175ad3c46436acb251e817b4374628072 (git)
Affected: 65f8b80053a1b2fd602daa6814e62d6fa90e5e9b , < 54b6bd40898de7906acb2bccc9a96d1b8e6b4323 (git)
Affected: 98953044b3cdb2cb7d82e7365b659e2ed4f4ca4d (git)
Affected: af8ecc8d20e72130771cc076bce7fcf17ccda6c4 (git)
Affected: c6fac5cf5a5098732623bcd00a8a3eb9f5465144 (git)
Affected: 96fa141fa295ae9428da73c56c9852053b575c04 (git)
Affected: 5.10.163 , < 5.10.267 (semver)
Affected: 5.15.61 , < 5.15.218 (semver)
Affected: 4.19.270 , < 4.20 (semver)
Affected: 5.4.229 , < 5.5 (semver)
Affected: 5.18.18 , < 5.19 (semver)
Affected: 5.19.2 , < 5.20 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (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-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: stop retrying saturated xattr cache entries\n\next4_xattr_block_set() retries when a cache entry selected for reuse\nhas a saturated reference count after taking the buffer lock. The retry\nreturns to the mbcache lookup without making that entry ineligible, so\nit can select the same unusable entry indefinitely. A task spinning\nthere can hold the parent directory\u0027s i_rwsem and leave concurrent\nrmdir callers blocked.\n\nNormally a reusable entry has a reference count below\nEXT4_XATTR_REFCOUNT_MAX because the count and MBE_REUSABLE_B are\nupdated under the same buffer lock. A corrupted filesystem can violate\nthat invariant. The syzbot reproducer reports allocator and xattr\ncorruption before triggering this retry loop.\n\nCheck the untrusted on-disk count before incrementing it, avoiding\noverflow, and clear MBE_REUSABLE_B when it is already saturated. The\nnext lookup then skips the entry that was just proven unusable. This\nmirrors the normal transition at EXT4_XATTR_REFCOUNT_MAX; the release\npath marks the entry reusable again on the exact 1024-to-1023\ntransition.\n\nUsing the same QEMU harness and guest parameters, current unpatched\nLinux hung in 6 of 8 420-second trials with the do_rmdir signature;\nrepresentative NMI backtraces caught the owner spinning in\next4_xattr_block_set(). The patched kernel completed 28 of 28 trials\nwithout a hung-task report; the final twelve trials exercised the\nreviewed overflow-safe form of the change. syzbot\u0027s patch testing also\ncompleted without reproducing the hang."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/54b6bd40898de7906acb2bccc9a96d1b8e6b4323"
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      "title": "ext4: stop retrying saturated xattr cache entries",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80808",
    "datePublished": "2026-09-04T15:13:28.562Z",
    "dateReserved": "2026-08-26T14:34:25.794Z",
    "dateUpdated": "2026-09-04T15:13:28.562Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80808",
      "date": "2026-09-16",
      "epss": "0.00195",
      "percentile": "0.09462"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-07T01:58:33.000Z",
      "cve": "CVE-2026-80808",
      "id": "msrc_CVE-2026-80808",
      "initial_release_date": "2026-09-07T01:58:33.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ext4: stop retrying saturated xattr cache entries",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80808.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80808\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:07.993\",\"lastModified\":\"2026-09-04T16:18:07.993\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: stop retrying saturated xattr cache entries\\n\\next4_xattr_block_set() retries when a cache entry selected for reuse\\nhas a saturated reference count after taking the buffer lock. The retry\\nreturns to the mbcache lookup without making that entry ineligible, so\\nit can select the same unusable entry indefinitely. A task spinning\\nthere can hold the parent directory\u0027s i_rwsem and leave concurrent\\nrmdir callers blocked.\\n\\nNormally a reusable entry has a reference count below\\nEXT4_XATTR_REFCOUNT_MAX because the count and MBE_REUSABLE_B are\\nupdated under the same buffer lock. A corrupted filesystem can violate\\nthat invariant. The syzbot reproducer reports allocator and xattr\\ncorruption before triggering this retry loop.\\n\\nCheck the untrusted on-disk count before incrementing it, avoiding\\noverflow, and clear MBE_REUSABLE_B when it is already saturated. The\\nnext lookup then skips the entry that was just proven unusable. This\\nmirrors the normal transition at EXT4_XATTR_REFCOUNT_MAX; the release\\npath marks the entry reusable again on the exact 1024-to-1023\\ntransition.\\n\\nUsing the same QEMU harness and guest parameters, current unpatched\\nLinux hung in 6 of 8 420-second trials with the do_rmdir signature;\\nrepresentative NMI backtraces caught the owner spinning in\\next4_xattr_block_set(). The patched kernel completed 28 of 28 trials\\nwithout a hung-task report; the final twelve trials exercised the\\nreviewed overflow-safe form of the change. syzbot\u0027s patch testing also\\ncompleted without reproducing the hang.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ext4/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1a56cd972ce121b6cf2517a47a578782bbd2ec95\",\"lessThan\":\"119a2f053242ed75bdd2ebc95baf3ae7db6ccacf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1be97463696c7291a3e1547614e96432b0bd3add\",\"lessThan\":\"61631352a5b405c89be579de00903b72e6888aa4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"8865cd664484517703df5c18a965dc3227572b87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"a40c45268f4358207aa9c53764fed2e05f62986a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"889ec86464d261f026f6c334040cfc6c58c99d58\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"4902a5cba21aeaf91e6b29e20e0967a5f6abdcd9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"55ee6533c1db7f7656fa8dd19637f3f8b8c08dc5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"dbd4aea175ad3c46436acb251e817b4374628072\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"65f8b80053a1b2fd602daa6814e62d6fa90e5e9b\",\"lessThan\":\"54b6bd40898de7906acb2bccc9a96d1b8e6b4323\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"98953044b3cdb2cb7d82e7365b659e2ed4f4ca4d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"af8ecc8d20e72130771cc076bce7fcf17ccda6c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6fac5cf5a5098732623bcd00a8a3eb9f5465144\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"96fa141fa295ae9428da73c56c9852053b575c04\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.163\",\"lessThan\":\"5.10.267\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.61\",\"lessThan\":\"5.15.218\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.270\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.229\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.18.18\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.19.2\",\"lessThan\":\"5.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ext4/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/119a2f053242ed75bdd2ebc95baf3ae7db6ccacf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4902a5cba21aeaf91e6b29e20e0967a5f6abdcd9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54b6bd40898de7906acb2bccc9a96d1b8e6b4323\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55ee6533c1db7f7656fa8dd19637f3f8b8c08dc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61631352a5b405c89be579de00903b72e6888aa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8865cd664484517703df5c18a965dc3227572b87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/889ec86464d261f026f6c334040cfc6c58c99d58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a40c45268f4358207aa9c53764fed2e05f62986a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbd4aea175ad3c46436acb251e817b4374628072\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:08:01Z",
      "cve": "CVE-2026-80808",
      "id": "CVE-2026-80808",
      "initial_release_date": "2026-09-08T23:58:31Z",
      "product_status:known_affected": "290",
      "product_status:known_not_affected": "63",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80808",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80808.json",
      "version": "4"
    }
  }
}



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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.


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.