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CVE-2026-89605 (GCVE-0-2026-89605)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
ecryptfs: release message context on send failure
Summary
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: release message context on send failure ecryptfs_send_message_locked() moves a message context from the free list to the allocated list before sending the request to the userspace daemon. If ecryptfs_send_miscdev() fails, the context is left on the allocated list and cannot be reused. Move it back to the free list on failure and clear the caller's pointer.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 177e0c32fec3602bb3b64139bb8bb610cd6722c7 (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 743e7aeb9575c0838d8996d40d81a6b8fa5cd060 (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 590fc6140e29c54d2f7839eb9df78d106ee1905e (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 30845ed227475a11a49ccce047837d016b7e0f49 (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 47ce611cb13f0eefa550d5434c1afcd4217bfc3e (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 9319706316a8e79f374627554386d575a84b637f (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 654b7e79443f5ea90849f5c1cf70c0d94bd5b10e (git)
Affected: f66e883eb6186bc43a79581b67aff7d1a69d0ff1 , < 219644a3ad5518217b2d62cad6d2c36a2308c949 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
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                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
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                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: release message context on send failure\n\necryptfs_send_message_locked() moves a message context from the free\nlist to the allocated list before sending the request to the userspace\ndaemon.\n\nIf ecryptfs_send_miscdev() fails, the context is left on the\nallocated list and cannot be reused. Move it back to the free list on\nfailure and clear the caller\u0027s pointer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only via local syscalls: open/creat on an eCryptfs mount drives pki_encrypt_session_key()/decrypt_pki_encrypted_session_key() into ecryptfs_send_message_locked(), and the per-euid daemon is registered with open(/dev/ecryptfs); no network or adjacent protocol path exists.\nAC:L - ecryptfs_send_miscdev() fails only on kmalloc(), which a local attacker in a memory cgroup can force by filling memory.max so the small GFP_KERNEL allocation returns NULL; the attacker then repeats create/open while running the daemon, with no race or other condition outside their control.\nPR:L - Neither miscdev_open() nor the PKI send path checks capabilities. An unprivileged user reaches this by running ecryptfsd on /dev/ecryptfs and using an eCryptfs mount from setuid mount.ecryptfs_private or an existing encrypted home, with a user-keyring PRIVATE_KEY auth token.\nUI:N - The attacker registers their own daemon, installs their own auth token, uses their own eCryptfs directory, and issues the create/open syscalls; no other user needs to mount, open a file, or otherwise interact.\nS:U - The leaked msg_ctx slots and any later use of the dangling msg_ctx-\u003etask pointer stay inside the host kernel\u0027s eCryptfs messaging subsystem; this is ordinary kernel impact, not a VM, IOMMU, or sandbox escape.\nC:H - A failed send leaves the msg_ctx PENDING with a raw task_struct pointer. After the sender exits, the attacker\u0027s daemon can write a MSG_RESPONSE with that index and predictable counter so ecryptfs_process_response() calls wake_up_process() on the freed task, a UAF that discloses kernel memory.\nI:H - The same task_struct use-after-free is heap-sprayable: wake_up_process() writes into a recycled task object and can hijack control flow. Stuck PENDING contexts are also never returned to the 32-slot global pool, breaking eCryptfs messaging for every user.\nA:H - Each failed send permanently removes one of 32 global msg_ctx slots from the free list until reboot, fully denying eCryptfs PKI wrap/unwrap for all users, and the dangling-task wake_up_process() path can oops or panic the kernel."
            }
          ]
        }
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        "dateUpdated": "2026-09-14T12:01:25.672Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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          "url": "https://git.kernel.org/stable/c/743e7aeb9575c0838d8996d40d81a6b8fa5cd060"
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      ],
      "title": "ecryptfs: release message context on send failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89605",
    "datePublished": "2026-09-11T19:45:08.101Z",
    "dateReserved": "2026-09-11T19:38:34.733Z",
    "dateUpdated": "2026-09-14T12:01:25.672Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-16",
      "epss": "0.00164",
      "percentile": "0.0599"
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Move it back to the free list on\\nfailure and clear the caller\u0027s pointer.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ecryptfs/messaging.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"177e0c32fec3602bb3b64139bb8bb610cd6722c7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"743e7aeb9575c0838d8996d40d81a6b8fa5cd060\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"590fc6140e29c54d2f7839eb9df78d106ee1905e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"30845ed227475a11a49ccce047837d016b7e0f49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"47ce611cb13f0eefa550d5434c1afcd4217bfc3e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"9319706316a8e79f374627554386d575a84b637f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"654b7e79443f5ea90849f5c1cf70c0d94bd5b10e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f66e883eb6186bc43a79581b67aff7d1a69d0ff1\",\"lessThan\":\"219644a3ad5518217b2d62cad6d2c36a2308c949\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ecryptfs/messaging.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.26\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.26\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/177e0c32fec3602bb3b64139bb8bb610cd6722c7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/219644a3ad5518217b2d62cad6d2c36a2308c949\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30845ed227475a11a49ccce047837d016b7e0f49\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47ce611cb13f0eefa550d5434c1afcd4217bfc3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/590fc6140e29c54d2f7839eb9df78d106ee1905e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/654b7e79443f5ea90849f5c1cf70c0d94bd5b10e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/743e7aeb9575c0838d8996d40d81a6b8fa5cd060\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9319706316a8e79f374627554386d575a84b637f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T06:58:55+00:00",
      "cve": "CVE-2026-89605",
      "id": "CVE-2026-89605",
      "initial_release_date": "2026-09-11T19:45:08.101000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel ecryptfs: Denial of Service due to message context leak on send failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89605.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T16:58:13Z",
      "cve": "CVE-2026-89605",
      "id": "CVE-2026-89605",
      "initial_release_date": "2026-09-12T16:25:16Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89605",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89605.json",
      "version": "3"
    }
  }
}



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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

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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.


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