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CVE-2026-89720 (GCVE-0-2026-89720)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
ubifs: fix out-of-bounds read in signature length check
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: fix out-of-bounds read in signature length check ubifs_sb_verify_signature() bounds the on-disk ubifs_sig_node->len field before handing the signature payload to verify_pkcs7_signature(), but the check has the wrong sign: if (le32_to_cpu(signode->len) > snod->len + sizeof(struct ubifs_sig_node)) The signature bytes start sizeof(struct ubifs_sig_node) (UBIFS_SIG_NODE_SZ, 64 bytes) into the node, so the payload is at most snod->len - sizeof(struct ubifs_sig_node) bytes long. Adding the header size instead of subtracting it accepts a declared length up to 2 * UBIFS_SIG_NODE_SZ larger than the node actually holds -- past the end of c->sbuf, which is vmalloc(c->leb_size). verify_pkcs7_signature() -> pkcs7_parse_message() -> asn1_ber_decoder() is then handed that inflated length and reads beyond the allocation while walking the DER headers. The node length comes straight from the mounted image, so a crafted signed UBIFS image reaches this via ubifs_read_superblock() before the signature is cryptographically checked. snod->len is guaranteed to be >= UBIFS_SIG_NODE_SZ by the node scanner (c->ranges[UBIFS_SIG_NODE].min_len == UBIFS_SIG_NODE_SZ), so the corrected subtraction cannot underflow. Legitimately signed images are unaffected: a correct superblock never declares a signature longer than the node it is embedded in.
Severity
7.7 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < ab7405bd86331cc2dbc8201699d4adc33bea75e7 (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < 11abc34698cb3172badf8aa12e623f1bac98bbd8 (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < 8cc3da72cf57acb4b77442ea8cec48425dff7c06 (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < 37a9d25a563f5f9103282954ce573c4a61321e7c (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < f76b79d6e42af20682495bccd22f72c7164b0018 (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < a1dc246f98bb94233effa4fa3ec7bf84700bb7d1 (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < 83e1aa9f5f906c9b1f4949d0521f0f950a159d96 (git)
Affected: 817aa094842dfc3a6b98c9582d4a647827f66201 , < 95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (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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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: fix out-of-bounds read in signature length check\n\nubifs_sb_verify_signature() bounds the on-disk ubifs_sig_node-\u003elen field\nbefore handing the signature payload to verify_pkcs7_signature(), but the\ncheck has the wrong sign:\n\n\tif (le32_to_cpu(signode-\u003elen) \u003e snod-\u003elen + sizeof(struct ubifs_sig_node))\n\nThe signature bytes start sizeof(struct ubifs_sig_node) (UBIFS_SIG_NODE_SZ,\n64 bytes) into the node, so the payload is at most\n\n\tsnod-\u003elen - sizeof(struct ubifs_sig_node)\n\nbytes long. Adding the header size instead of subtracting it accepts a\ndeclared length up to 2 * UBIFS_SIG_NODE_SZ larger than the node actually\nholds -- past the end of c-\u003esbuf, which is vmalloc(c-\u003eleb_size).\nverify_pkcs7_signature() -\u003e pkcs7_parse_message() -\u003e asn1_ber_decoder()\nis then handed that inflated length and reads beyond the allocation while\nwalking the DER headers. The node length comes straight from the mounted\nimage, so a crafted signed UBIFS image reaches this via\nubifs_read_superblock() before the signature is cryptographically checked.\n\nsnod-\u003elen is guaranteed to be \u003e= UBIFS_SIG_NODE_SZ by the node scanner\n(c-\u003eranges[UBIFS_SIG_NODE].min_len == UBIFS_SIG_NODE_SZ), so the corrected\nsubtraction cannot underflow. Legitimately signed images are unaffected: a\ncorrect superblock never declares a signature longer than the node it is\nembedded in."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:L - The OOB read is reached only while mounting a local UBIFS/UBI volume (mount \u2192 ubifs_fill_super \u2192 mount_ubifs \u2192 ubifs_read_superblock \u2192 authenticate_sb_node \u2192 ubifs_sb_verify_signature). The inflated ubifs_sig_node-\u003elen comes from on-disk flash, not ksmbd, nfsd, or any received-packet path.\nAC:L - The attacker fully controls the on-disk SIG node size and signode-\u003elen. The inverted check accepts a payload up to snod-\u003elen+64; with a node filling the LEB that deterministically reads 128 bytes past vmalloc\u0027d c-\u003esbuf in asn1_ber_decoder(), with no race or uncontrolled layout.\nPR:N - Supplying the crafted authenticated image needs no account on the victim. ubifs_fs_type lacks FS_USERNS_MOUNT, so the CAP_SYS_ADMIN mount (boot-time auth_key mount on embedded, automotive, and IoT devices that use offline-signed UBIFS) is performed by the platform, matching the malicious-filesystem model.\nUI:N - Offline-signed UBIFS is verified automatically at mount; boot/fstab auto-mount with auth_key runs ubifs_sb_verify_signature in ubifs_read_superblock before any file access, so planting or presenting the crafted volume is sufficient with no separate victim click or open.\nS:U - The out-of-bounds read and any oops remain inside the mounting host kernel. This is a same-authority memory-safety issue, not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - verify_pkcs7_signature() \u2192 pkcs7_parse_message() \u2192 asn1_ber_decoder() walks an attacker-inflated length of up to 128 bytes past c-\u003esbuf (vmalloc of the LEB). That is an out-of-bounds kernel read of adjacent vmalloc memory, which is Confidentiality High rather than a few-byte leak.\nI:N - The defect is an out-of-bounds read of PKCS#7/ASN.1 headers; the decoder copies those bytes only into newly allocated parse objects sized from the claimed length and does not write past any allocation or provide an arbitrary-write or control-flow primitive.\nA:H - Reading past the vmalloc LEB buffer into an unmapped vmalloc guard page oopses or panics the kernel during mount, and a crafted image can retrigger that crash on every boot or mount of the volume."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf"
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      "title": "ubifs: fix out-of-bounds read in signature length check",
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    "cveId": "CVE-2026-89720",
    "datePublished": "2026-09-11T19:46:32.923Z",
    "dateReserved": "2026-09-11T19:38:34.752Z",
    "dateUpdated": "2026-09-14T12:02:12.826Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-14",
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Adding the header size instead of subtracting it accepts a\\ndeclared length up to 2 * UBIFS_SIG_NODE_SZ larger than the node actually\\nholds -- past the end of c-\u003esbuf, which is vmalloc(c-\u003eleb_size).\\nverify_pkcs7_signature() -\u003e pkcs7_parse_message() -\u003e asn1_ber_decoder()\\nis then handed that inflated length and reads beyond the allocation while\\nwalking the DER headers. The node length comes straight from the mounted\\nimage, so a crafted signed UBIFS image reaches this via\\nubifs_read_superblock() before the signature is cryptographically checked.\\n\\nsnod-\u003elen is guaranteed to be \u003e= UBIFS_SIG_NODE_SZ by the node scanner\\n(c-\u003eranges[UBIFS_SIG_NODE].min_len == UBIFS_SIG_NODE_SZ), so the corrected\\nsubtraction cannot underflow. Legitimately signed images are unaffected: a\\ncorrect superblock never declares a signature longer than the node it is\\nembedded in.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ubifs/auth.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"ab7405bd86331cc2dbc8201699d4adc33bea75e7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"11abc34698cb3172badf8aa12e623f1bac98bbd8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"8cc3da72cf57acb4b77442ea8cec48425dff7c06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"37a9d25a563f5f9103282954ce573c4a61321e7c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"f76b79d6e42af20682495bccd22f72c7164b0018\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"a1dc246f98bb94233effa4fa3ec7bf84700bb7d1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"83e1aa9f5f906c9b1f4949d0521f0f950a159d96\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"817aa094842dfc3a6b98c9582d4a647827f66201\",\"lessThan\":\"95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ubifs/auth.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"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:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/11abc34698cb3172badf8aa12e623f1bac98bbd8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/37a9d25a563f5f9103282954ce573c4a61321e7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83e1aa9f5f906c9b1f4949d0521f0f950a159d96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cc3da72cf57acb4b77442ea8cec48425dff7c06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95d27c1708bb6e8823c8e7c623f9abc2a91bf4bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1dc246f98bb94233effa4fa3ec7bf84700bb7d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab7405bd86331cc2dbc8201699d4adc33bea75e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f76b79d6e42af20682495bccd22f72c7164b0018\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T07:01:06+00:00",
      "cve": "CVE-2026-89720",
      "id": "CVE-2026-89720",
      "initial_release_date": "2026-09-11T19:46:32.923000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Out-of-bounds read in UBIFS signature length check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89720.json",
      "version": "3"
    }
  }
}



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Tags
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.