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CVE-2026-89608 (GCVE-0-2026-89608)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:45 – Updated: 2026-09-14 12:01
VLAI
Title
ecryptfs: pass packet set buffer size to parser
Summary
In the Linux kernel, the following vulnerability has been resolved: ecryptfs: pass packet set buffer size to parser ecryptfs_parse_packet_set() receives a pointer into the file header, but it calculates the remaining packet buffer size from PAGE_SIZE - 8. For version 1 headers the packet set starts later in the header, so this can overstate the available buffer. Pass the actual packet set buffer length from the caller and calculate per-packet limits from the remaining bytes in that buffer. Recompute the remaining length after consuming a tag 3 packet before parsing the following tag 11 packet.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < e7573b0e3058c6bbdfe81673f22c09900fde9e65 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 66a87559ecb26afe80ad512faf728a158e2b81da (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 3bd9bb3e167a7c14a50423f6ff03ee0fb007199d (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 329de8b9e988b152b938f09224670d97bada0b96 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < e5d254e654f2311a3c4b9c791d7f216554bcd17a (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 747fd45be396a6aea3420ab657a0ab4e60185b05 (git)
Affected: 237fead619984cc48818fe12ee0ceada3f55b012 , < 2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2 (git)
guessed Create a notification for this product.
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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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: pass packet set buffer size to parser\n\necryptfs_parse_packet_set() receives a pointer into the file header, but\nit calculates the remaining packet buffer size from PAGE_SIZE - 8.  For\nversion 1 headers the packet set starts later in the header, so this can\noverstate the available buffer.\n\nPass the actual packet set buffer length from the caller and calculate\nper-packet limits from the remaining bytes in that buffer.  Recompute the\nremaining length after consuming a tag 3 packet before parsing the\nfollowing tag 11 packet."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The over-read is reached only by a local open or setattr on an eCryptfs mount (ecryptfs_open/ecryptfs_setattr \u2192 ecryptfs_read_metadata \u2192 ecryptfs_parse_packet_set) which parses the attacker-supplied lower-file header or xattr; this is not a network protocol path.\nAC:L - Opening a crafted eCryptfs file deterministically feeds attacker-controlled version-1 headers and Tag 1/3/11 lengths into parse_packet_set(), which then uses an overstated PAGE_SIZE-8 bound; no race or uninfluenced memory layout is required.\nPR:L - An unprivileged user reaches this on standard eCryptfs deployments (setuid-root mount.ecryptfs_private and per-user encrypted home/Private) by planting a crafted file in their own lower directory and opening it through the already-mounted tree; init-namespace root is not required.\nUI:N - The attacker writes the malformed header into their lower directory and opens the corresponding eCryptfs file themselves; no action by another user is required.\nS:U - The out-of-bounds header-slab read and any resulting oops stay inside the host kernel eCryptfs code; this is not a VM escape, IOMMU bypass, or other cross-authority breakout.\nC:H - parse_packet_set() treats PAGE_SIZE-8 as the packet-set limit even after the version-1 header advances the pointer, and Tag 11 is parsed with the pre-Tag-3 remainder so max_packet_size can underflow; subsequent Tag 1 copies up to 512 bytes from adjacent slab/pages, an OOB read rated High unless a few bytes.\nI:N - Packet parsers memcpy into size-checked destinations (encrypted_key[], sig_tmp_space[8]); this bug is a source over-read of the PAGE_SIZE header cache object, not an out-of-bounds write, UAF, or control-flow hijack primitive.\nA:H - After the size_t remainder underflows, src[i] and later memcpy() walk off the header cache object into adjacent or unmapped pages and can oops; the attacker can reopen the crafted file to crash the host at will."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65"
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          "url": "https://git.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81da"
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      "title": "ecryptfs: pass packet set buffer size to parser",
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    "cveId": "CVE-2026-89608",
    "datePublished": "2026-09-11T19:45:10.318Z",
    "dateReserved": "2026-09-11T19:38:34.733Z",
    "dateUpdated": "2026-09-14T12:01:28.889Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-15",
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Recompute the\\nremaining length after consuming a tag 3 packet before parsing the\\nfollowing tag 11 packet.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ecryptfs/crypto.c\",\"fs/ecryptfs/ecryptfs_kernel.h\",\"fs/ecryptfs/keystore.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"e7573b0e3058c6bbdfe81673f22c09900fde9e65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"66a87559ecb26afe80ad512faf728a158e2b81da\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"3bd9bb3e167a7c14a50423f6ff03ee0fb007199d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"329de8b9e988b152b938f09224670d97bada0b96\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"e5d254e654f2311a3c4b9c791d7f216554bcd17a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"747fd45be396a6aea3420ab657a0ab4e60185b05\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"237fead619984cc48818fe12ee0ceada3f55b012\",\"lessThan\":\"2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ecryptfs/crypto.c\",\"fs/ecryptfs/ecryptfs_kernel.h\",\"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:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2602b79c5b3e2f6fce12e38a670f8e3fda4e46a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/329de8b9e988b152b938f09224670d97bada0b96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3bd9bb3e167a7c14a50423f6ff03ee0fb007199d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66a87559ecb26afe80ad512faf728a158e2b81da\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/747fd45be396a6aea3420ab657a0ab4e60185b05\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/749fa08d8f1b318bd8f4669a14a8a4a8c1bbdaac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5d254e654f2311a3c4b9c791d7f216554bcd17a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e7573b0e3058c6bbdfe81673f22c09900fde9e65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T06:59:04+00:00",
      "cve": "CVE-2026-89608",
      "id": "CVE-2026-89608",
      "initial_release_date": "2026-09-11T19:45:10.318000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: ecryptfs buffer size miscalculation vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89608.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T16:58:08Z",
      "cve": "CVE-2026-89608",
      "id": "CVE-2026-89608",
      "initial_release_date": "2026-09-12T16:25:11Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89608",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89608.json",
      "version": "3"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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