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CVE-2026-46124 (GCVE-0-2026-46124)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-08-05 12:29
VLAI
Title
isofs: validate block number from NFS file handle in isofs_export_iget
Summary
In the Linux kernel, the following vulnerability has been resolved: isofs: validate block number from NFS file handle in isofs_export_iget isofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker- controlled block number (ifid->block or ifid->parent_block) from the NFS file handle to isofs_export_iget(), which only rejects block == 0 before calling isofs_iget() and ultimately sb_bread(). A crafted file handle with fh_len sufficient to pass the check added by commit 0405d4b63d08 ("isofs: Prevent the use of too small fid") can still drive the server to read any in-range block on the backing device as if it were an iso_directory_record. That earlier fix was assigned CVE-2025-37780. sb_bread() on an out-of-range block returns NULL cleanly via the EIO path, so there is no memory-safety violation. For in-range reads of adjacent-partition data on the same block device, the unrelated bytes end up in iso_inode_info fields that reach the NFS client as dentry metadata. The deployment surface (isofs exported over NFS from loop-mounted images) is narrow and requires an authenticated NFS peer, but the malformed-file-handle class is reportable as hardening next to the existing CVE-2025-37780 fix. Reject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so the check covers both isofs_fh_to_dentry() and isofs_fh_to_parent() call sites with a single line.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e7de55602c61c8ff28db075cc49c8dd6989d7e0 , < ee0024f5a7e3c73aa253869fae9650ae054093ca (git)
Affected: 63d5a3e207bf315a32c7d16de6c89753a759f95a , < 31dbb4ba0f719ae7774e4c0c95172c9bf81692f5 (git)
Affected: 0fdafdaef796816a9ed0fd7ac812932d569d9beb , < 908a76f0b1038035e6ebb4f2293ce079f92e0a02 (git)
Affected: 952e7a7e317f126d0a2b879fc531b716932d5ffa , < bb0988ed4f2e26d59bbb58f644cb3a55b7521e21 (git)
Affected: 56dfffea9fd3be0b3795a9ca6401e133a8427e0b , < 0a1af74ae2177bda3aee0837a0546309aa539d0d (git)
Affected: 0405d4b63d082861f4eaff9d39c78ee9dc34f845 , < afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b (git)
Affected: 0405d4b63d082861f4eaff9d39c78ee9dc34f845 , < 4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6 (git)
Affected: 0405d4b63d082861f4eaff9d39c78ee9dc34f845 , < 24376458138387fb251e782e624c7776e9826796 (git)
Affected: ee01a309ebf598be1ff8174901ed6e91619f1749 (git)
Affected: 007124c896e7d4614ac1f6bd4dedb975c35a2a8e (git)
Affected: 5.10.237 , < 5.10.258 (semver)
Affected: 5.15.181 , < 5.15.209 (semver)
Affected: 6.1.135 , < 6.1.175 (semver)
Affected: 6.6.88 , < 6.6.140 (semver)
Affected: 6.12.25 , < 6.12.88 (semver)
Affected: 5.4.293 , < 5.5 (semver)
Affected: 6.14.4 , < 6.15 (semver)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nisofs: validate block number from NFS file handle in isofs_export_iget\n\nisofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker-\ncontrolled block number (ifid-\u003eblock or ifid-\u003eparent_block) from\nthe NFS file handle to isofs_export_iget(), which only rejects\nblock == 0 before calling isofs_iget() and ultimately sb_bread().\nA crafted file handle with fh_len sufficient to pass the check\nadded by commit 0405d4b63d08 (\"isofs: Prevent the use of too small\nfid\") can still drive the server to read any in-range block on the\nbacking device as if it were an iso_directory_record.  That earlier\nfix was assigned CVE-2025-37780.\n\nsb_bread() on an out-of-range block returns NULL cleanly via the\nEIO path, so there is no memory-safety violation.  For in-range\nreads of adjacent-partition data on the same block device, the\nunrelated bytes end up in iso_inode_info fields that reach the NFS\nclient as dentry metadata.  The deployment surface (isofs exported\nover NFS from loop-mounted images) is narrow and requires an\nauthenticated NFS peer, but the malformed-file-handle class is\nreportable as hardening next to the existing CVE-2025-37780 fix.\n\nReject block \u003e= ISOFS_SB(sb)-\u003es_nzones in isofs_export_iget() so\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\ncall sites with a single line."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/ee0024f5a7e3c73aa253869fae9650ae054093ca"
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        {
          "url": "https://git.kernel.org/stable/c/31dbb4ba0f719ae7774e4c0c95172c9bf81692f5"
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        },
        {
          "url": "https://git.kernel.org/stable/c/24376458138387fb251e782e624c7776e9826796"
        }
      ],
      "title": "isofs: validate block number from NFS file handle in isofs_export_iget",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46124",
    "datePublished": "2026-05-28T09:35:38.887Z",
    "dateReserved": "2026-05-13T15:03:33.098Z",
    "dateUpdated": "2026-08-05T12:29:53.831Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-46124",
      "date": "2026-09-16",
      "epss": "0.00425",
      "percentile": "0.36168"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-09T14:44:20.000Z",
      "cve": "CVE-2026-46124",
      "id": "msrc_CVE-2026-46124",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "isofs: validate block number from NFS file handle in isofs_export_iget",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46124.json",
      "version": "3"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46124\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-28T10:16:27.920\",\"lastModified\":\"2026-06-24T16:51:14.923\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nisofs: validate block number from NFS file handle in isofs_export_iget\\n\\nisofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker-\\ncontrolled block number (ifid-\u003eblock or ifid-\u003eparent_block) from\\nthe NFS file handle to isofs_export_iget(), which only rejects\\nblock == 0 before calling isofs_iget() and ultimately sb_bread().\\nA crafted file handle with fh_len sufficient to pass the check\\nadded by commit 0405d4b63d08 (\\\"isofs: Prevent the use of too small\\nfid\\\") can still drive the server to read any in-range block on the\\nbacking device as if it were an iso_directory_record.  That earlier\\nfix was assigned CVE-2025-37780.\\n\\nsb_bread() on an out-of-range block returns NULL cleanly via the\\nEIO path, so there is no memory-safety violation.  For in-range\\nreads of adjacent-partition data on the same block device, the\\nunrelated bytes end up in iso_inode_info fields that reach the NFS\\nclient as dentry metadata.  The deployment surface (isofs exported\\nover NFS from loop-mounted images) is narrow and requires an\\nauthenticated NFS peer, but the malformed-file-handle class is\\nreportable as hardening next to the existing CVE-2025-37780 fix.\\n\\nReject block \u003e= ISOFS_SB(sb)-\u003es_nzones in isofs_export_iget() so\\nthe check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()\\ncall sites with a single line.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/isofs/export.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5e7de55602c61c8ff28db075cc49c8dd6989d7e0\",\"lessThan\":\"ee0024f5a7e3c73aa253869fae9650ae054093ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"63d5a3e207bf315a32c7d16de6c89753a759f95a\",\"lessThan\":\"31dbb4ba0f719ae7774e4c0c95172c9bf81692f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fdafdaef796816a9ed0fd7ac812932d569d9beb\",\"lessThan\":\"908a76f0b1038035e6ebb4f2293ce079f92e0a02\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"952e7a7e317f126d0a2b879fc531b716932d5ffa\",\"lessThan\":\"bb0988ed4f2e26d59bbb58f644cb3a55b7521e21\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"56dfffea9fd3be0b3795a9ca6401e133a8427e0b\",\"lessThan\":\"0a1af74ae2177bda3aee0837a0546309aa539d0d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0405d4b63d082861f4eaff9d39c78ee9dc34f845\",\"lessThan\":\"afbafeddf23db13fe2edb2d5c0bf4bbb13d7881b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0405d4b63d082861f4eaff9d39c78ee9dc34f845\",\"lessThan\":\"4c721a1d9b3c4fcaf59cc9b2281e3ec5a043e1a6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0405d4b63d082861f4eaff9d39c78ee9dc34f845\",\"lessThan\":\"24376458138387fb251e782e624c7776e9826796\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ee01a309ebf598be1ff8174901ed6e91619f1749\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"007124c896e7d4614ac1f6bd4dedb975c35a2a8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.237\",\"lessThan\":\"5.10.258\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.181\",\"lessThan\":\"5.15.209\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.135\",\"lessThan\":\"6.1.175\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.88\",\"lessThan\":\"6.6.140\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.25\",\"lessThan\":\"6.12.88\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.293\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.14.4\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/isofs/export.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.88\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.30\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.7\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.293\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"4D6F83CA-7E5C-4A91-9D8C-71CC85535E7D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.237\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"D8832159-E9F2-4E3A-869E-F397B4D75488\"},{\"vulnerable\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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:16:06+00:00",
      "cve": "CVE-2026-46124",
      "id": "CVE-2026-46124",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: isofs: validate block number from NFS file handle in isofs_export_iget",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46124.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:12:12Z",
      "cve": "CVE-2026-46124",
      "id": "CVE-2026-46124",
      "initial_release_date": "2026-05-29T01:16:47Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "424",
      "product_status:known_not_affected": "219",
      "product_status:recommended": "318",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46124",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46124.json",
      "version": "16"
    }
  }
}



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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.