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CVE-2026-89607 (GCVE-0-2026-89607)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet
Summary
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet parse_tag_3_packet() set encrypted_key_size from the Tag 3 packet body without bounding it against ECRYPTFS_MAX_KEY_BYTES (64). When encrypted_key_size > 64, decrypt_passphrase_encrypted_session_key() sets decrypted_key_size = encrypted_key_size and performs two out-of-bounds writes: 1. crypto_skcipher_decrypt() writes encrypted_key_size bytes into decrypted_key[64] via scatterlist, overflowing into the parent ecryptfs_auth_tok struct. 2. memcpy(crypt_stat->key, decrypted_key, decrypted_key_size) writes into crypt_stat->key[64], corrupting root_iv, keysig_list, and mutexes in ecryptfs_crypt_stat. Only AES-192 (cipher code 0x08) enables this because it sets crypt_stat->key_size = 24 independently of encrypted_key_size, allowing crypto_skcipher_setkey() to succeed while encrypted_key_size exceeds ECRYPTFS_MAX_KEY_BYTES. The PKI decryption path (parse_tag_65_packet) already validates decrypted_key_size <= ECRYPTFS_MAX_KEY_BYTES; the passphrase path omits this check. Bound encrypted_key_size against ECRYPTFS_MAX_KEY_BYTES (64) rather than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES (512). The 64-byte limit also protects the 512-byte encrypted_key[] buffer, so the former 512-byte check is removed as redundant. [tyhicks: Adjust the code comment to refer to macros representing the buffer sizes rather than mentioning the buffer size values since they may change in the future]
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: 237fead619984cc48818fe12ee0ceada3f55b012 , < 2cd21340163494d312836c77c9fbfe2530b3d075 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < e2152d491ae62d96a32ed59778680a242af1fbc6 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < d2802414081184f79a619ede178aeef3aa989793 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 33e050cac841498b5175f0f385eee903fd98863c (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < ccd13eff0e7356d2aa28b127b577e4e5ad4563f5 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 14cb36a500a5a3afbc955dbf69dabc565f1a3b26 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < a419c9ebfc9a40ee56aaad6dc68bfd67d400817b (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 5babe9c177c364521e3e682b949c5a8c47f4a441 (git)
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Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (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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{
  "containers": {
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: reject oversized encrypted_key_size in parse_tag_3_packet\n\nparse_tag_3_packet() set encrypted_key_size from the Tag 3 packet body\nwithout bounding it against ECRYPTFS_MAX_KEY_BYTES (64). When\nencrypted_key_size \u003e 64, decrypt_passphrase_encrypted_session_key()\nsets decrypted_key_size = encrypted_key_size and performs two\nout-of-bounds writes:\n\n1. crypto_skcipher_decrypt() writes encrypted_key_size bytes into\n   decrypted_key[64] via scatterlist, overflowing into the parent\n   ecryptfs_auth_tok struct.\n2. memcpy(crypt_stat-\u003ekey, decrypted_key, decrypted_key_size) writes\n   into crypt_stat-\u003ekey[64], corrupting root_iv, keysig_list, and\n   mutexes in ecryptfs_crypt_stat.\n\nOnly AES-192 (cipher code 0x08) enables this because it sets\ncrypt_stat-\u003ekey_size = 24 independently of encrypted_key_size,\nallowing crypto_skcipher_setkey() to succeed while encrypted_key_size\nexceeds ECRYPTFS_MAX_KEY_BYTES.\n\nThe PKI decryption path (parse_tag_65_packet) already validates\ndecrypted_key_size \u003c= ECRYPTFS_MAX_KEY_BYTES; the passphrase path\nomits this check.\n\nBound encrypted_key_size against ECRYPTFS_MAX_KEY_BYTES (64) rather\nthan ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES (512). The 64-byte limit also\nprotects the 512-byte encrypted_key[] buffer, so the former 512-byte\ncheck is removed as redundant.\n\n[tyhicks: Adjust the code comment to refer to macros representing the\n buffer sizes rather than mentioning the buffer size values since they\n may change in the future]"
        }
      ],
      "metrics": [
        {
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            "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"
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              "lang": "en",
              "value": "AV:L - Triggered by a local open/setattr on an eCryptfs mount: ecryptfs_open -\u003e read_or_initialize_metadata -\u003e ecryptfs_read_metadata parses attacker-supplied Tag 3 packets from the lower file header (or xattr). The kernel does not process this as network protocol data.\nAC:L - The attacker fully controls the Tag 3 body, including AES-192 cipher code 0x08 and an AES-block-aligned encrypted_key_size of 80-512 bytes. decrypt_passphrase_encrypted_session_key() then overflows deterministically; no race or uninfluenced memory layout is required to trigger the writes.\nPR:L - An unprivileged user reaches this on standard eCryptfs deployments (setuid-root mount.ecryptfs_private and per-user encrypted home/Private). They plant a crafted lower file under their own .Private directory and open it through the already-mounted eCryptfs tree; init-namespace root is not required.\nUI:N - The attacker performs the whole sequence themselves: install a matching passphrase auth token, write the malformed Tag 3/Tag 11 header into their lower directory, and open the file. No action by another user is required.\nS:U - The out-of-bounds writes corrupt kernel heap and eCryptfs inode-private objects in the same kernel security authority. This is local privilege escalation, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - crypto_skcipher_decrypt() and memcpy() write tens to hundreds of bytes past decrypted_key[64] and crypt_stat-\u003ekey[64], overflowing into reserved/token fields, keysig_list, mutexes, and adjacent slab/inode-cache objects. That heap corruption can be groomed into an arbitrary kernel read.\nI:H - Session-key wrap uses AES-ECB with the attacker\u0027s known passphrase-derived key, so the overflow payload is chosen plaintext. Up to 448 bytes past the 64-byte buffers corrupt list_head pointers and neighboring slab objects, yielding a write primitive for control-flow hijack.\nA:H - Corrupting keysig_list, embedded mutexes, and adjacent inode-cache/slab objects causes kernel oops or panic. The attacker can open the crafted file repeatedly to crash the system at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:01:27.820Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2cd21340163494d312836c77c9fbfe2530b3d075"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2152d491ae62d96a32ed59778680a242af1fbc6"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2802414081184f79a619ede178aeef3aa989793"
        },
        {
          "url": "https://git.kernel.org/stable/c/33e050cac841498b5175f0f385eee903fd98863c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccd13eff0e7356d2aa28b127b577e4e5ad4563f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/14cb36a500a5a3afbc955dbf69dabc565f1a3b26"
        },
        {
          "url": "https://git.kernel.org/stable/c/a419c9ebfc9a40ee56aaad6dc68bfd67d400817b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5babe9c177c364521e3e682b949c5a8c47f4a441"
        }
      ],
      "title": "ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89607",
    "datePublished": "2026-09-11T19:45:09.583Z",
    "dateReserved": "2026-09-11T19:38:34.733Z",
    "dateUpdated": "2026-09-14T12:01:27.820Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89607",
      "date": "2026-09-14",
      "epss": "0.00163",
      "percentile": "0.05858"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-15T01:45:32.000Z",
      "cve": "CVE-2026-89607",
      "id": "msrc_CVE-2026-89607",
      "initial_release_date": "2026-09-13T01:10:12.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89607.json",
      "version": "3"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89607\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:45.723\",\"lastModified\":\"2026-09-14T13:19:14.910\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\necryptfs: reject oversized encrypted_key_size in parse_tag_3_packet\\n\\nparse_tag_3_packet() set encrypted_key_size from the Tag 3 packet body\\nwithout bounding it against ECRYPTFS_MAX_KEY_BYTES (64). When\\nencrypted_key_size \u003e 64, decrypt_passphrase_encrypted_session_key()\\nsets decrypted_key_size = encrypted_key_size and performs two\\nout-of-bounds writes:\\n\\n1. crypto_skcipher_decrypt() writes encrypted_key_size bytes into\\n   decrypted_key[64] via scatterlist, overflowing into the parent\\n   ecryptfs_auth_tok struct.\\n2. memcpy(crypt_stat-\u003ekey, decrypted_key, decrypted_key_size) writes\\n   into crypt_stat-\u003ekey[64], corrupting root_iv, keysig_list, and\\n   mutexes in ecryptfs_crypt_stat.\\n\\nOnly AES-192 (cipher code 0x08) enables this because it sets\\ncrypt_stat-\u003ekey_size = 24 independently of encrypted_key_size,\\nallowing crypto_skcipher_setkey() to succeed while encrypted_key_size\\nexceeds ECRYPTFS_MAX_KEY_BYTES.\\n\\nThe PKI decryption path (parse_tag_65_packet) already validates\\ndecrypted_key_size \u003c= ECRYPTFS_MAX_KEY_BYTES; the passphrase path\\nomits this check.\\n\\nBound encrypted_key_size against ECRYPTFS_MAX_KEY_BYTES (64) rather\\nthan ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES (512). The 64-byte limit also\\nprotects the 512-byte encrypted_key[] buffer, so the former 512-byte\\ncheck is removed as redundant.\\n\\n[tyhicks: Adjust the code comment to refer to macros representing the\\n buffer sizes rather than mentioning the buffer size values since they\\n may change in the future]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ecryptfs/keystore.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"2cd21340163494d312836c77c9fbfe2530b3d075\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"e2152d491ae62d96a32ed59778680a242af1fbc6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"d2802414081184f79a619ede178aeef3aa989793\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"33e050cac841498b5175f0f385eee903fd98863c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"ccd13eff0e7356d2aa28b127b577e4e5ad4563f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"14cb36a500a5a3afbc955dbf69dabc565f1a3b26\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"a419c9ebfc9a40ee56aaad6dc68bfd67d400817b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"5babe9c177c364521e3e682b949c5a8c47f4a441\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ecryptfs/keystore.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.19\",\"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/14cb36a500a5a3afbc955dbf69dabc565f1a3b26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2cd21340163494d312836c77c9fbfe2530b3d075\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33e050cac841498b5175f0f385eee903fd98863c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5babe9c177c364521e3e682b949c5a8c47f4a441\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a419c9ebfc9a40ee56aaad6dc68bfd67d400817b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ccd13eff0e7356d2aa28b127b577e4e5ad4563f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2802414081184f79a619ede178aeef3aa989793\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2152d491ae62d96a32ed59778680a242af1fbc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-15T09:42:44+00:00",
      "cve": "CVE-2026-89607",
      "id": "CVE-2026-89607",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_not_affected": "262",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T16:58:10Z",
      "cve": "CVE-2026-89607",
      "id": "CVE-2026-89607",
      "initial_release_date": "2026-09-12T16:25:13Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89607",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89607.json",
      "version": "4"
    }
  }
}



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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.