Vulnerability-Lookup

OESA-2025-2312 (CVE-2025-38710)

Vulnerability from osv_openeuler – Published: 2025-09-19 11:09 – Updated: 2026-08-06 11:09 – Source website

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:

gfs2: Validate i_depth for exhash directories

A fuzzer test introduced corruption that ends up with a depth of 0 in dir_e_read(), causing an undefined shift by 32 at:

index = hash >> (32 - dip->i_depth);

As calculated in an open-coded way in dir_make_exhash(), the minimum depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time.

So we can avoid the undefined behaviour by checking for depth values lower than the minimum in gfs2_dinode_in(). Values greater than the maximum are already being checked for there.

Also switch the calculation in dir_make_exhash() to use ilog2() to clarify how the depth is calculated.

Tested with the syzkaller repro.c and xfstests '-g quick'.(CVE-2025-38710)

Severity

7.0 (High)


                    
                      CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-38710	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bpftool-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "bpftool-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-debugsource-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-devel-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-source-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-tools-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-tools-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "kernel-tools-devel-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "perf-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "python2-perf-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "python2-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "python3-perf-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm",
          "python3-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.aarch64.rpm"
        ],
        "src": [
          "kernel-4.19.90-2509.5.0.0344.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "bpftool-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "bpftool-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-debugsource-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-devel-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-source-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-tools-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-tools-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "kernel-tools-devel-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "perf-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "python2-perf-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "python2-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "python3-perf-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm",
          "python3-perf-debuginfo-4.19.90-2509.5.0.0344.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.19.90-2509.5.0.0344.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Validate i_depth for exhash directories\n\nA fuzzer test introduced corruption that ends up with a depth of 0 in\ndir_e_read(), causing an undefined shift by 32 at:\n\n  index = hash \u0026gt;\u0026gt; (32 - dip-\u0026gt;i_depth);\n\nAs calculated in an open-coded way in dir_make_exhash(), the minimum\ndepth for an exhash directory is ilog2(sdp-\u0026gt;sd_hash_ptrs) and 0 is\ninvalid as sdp-\u0026gt;sd_hash_ptrs is fixed as sdp-\u0026gt;bsize / 16 at mount time.\n\nSo we can avoid the undefined behaviour by checking for depth values\nlower than the minimum in gfs2_dinode_in(). Values greater than the\nmaximum are already being checked for there.\n\nAlso switch the calculation in dir_make_exhash() to use ilog2() to\nclarify how the depth is calculated.\n\nTested with the syzkaller repro.c and xfstests \u0026apos;-g quick\u0026apos;.(CVE-2025-38710)",
  "id": "OESA-2025-2312",
  "modified": "2026-08-06T11:09:23Z",
  "published": "2025-09-19T11:09:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-2312"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38710"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2025-38710"
  ]
}

CVE-2025-38710 (GCVE-0-2025-38710)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:33 – Updated: 2026-08-05 12:04

Title

gfs2: Validate i_depth for exhash directories

Summary

In the Linux kernel, the following vulnerability has been resolved: gfs2: Validate i_depth for exhash directories A fuzzer test introduced corruption that ends up with a depth of 0 in dir_e_read(), causing an undefined shift by 32 at: index = hash >> (32 - dip->i_depth); As calculated in an open-coded way in dir_make_exhash(), the minimum depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time. So we can avoid the undefined behaviour by checking for depth values lower than the minimum in gfs2_dinode_in(). Values greater than the maximum are already being checked for there. Also switch the calculation in dir_make_exhash() to use ilog2() to clarify how the depth is calculated. Tested with the syzkaller repro.c and xfstests '-g quick'.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/076e992752e4b2417…
https://git.kernel.org/stable/c/366183911b153e9b8…
https://git.kernel.org/stable/c/112bb60cd0e254a36…
https://git.kernel.org/stable/c/cddea0c721106ea48…
https://git.kernel.org/stable/c/53a0249d68a210c16…
https://git.kernel.org/stable/c/b5f46951e62377b6e…
https://git.kernel.org/stable/c/9680c58675b82348a…
https://git.kernel.org/stable/c/557c024ca7250bb65…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < 076e992752e4b24178918f748d75597c80a408d2 (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < 366183911b153e9b8cf758e1414e1154d7569337 (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < 112bb60cd0e254a369e95aa9941a694ffeca089f (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < cddea0c721106ea480371412d8de21705eb27376 (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < 53a0249d68a210c16e961b83adfa82f94ee0a53d (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < b5f46951e62377b6e406fadc18bc3c5bdf1632a7 (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < 9680c58675b82348ab84d387e4fa727f7587e1a0 (git) Affected: 9a0045088d888c9c539c8c626a366cb52c0fbdab , < 557c024ca7250bb65ae60f16c02074106c2f197b (git)
Linux	Linux	Affected: 2.6.26 Unaffected: 0 , < 2.6.26 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.43 , ≤ 6.12.* (semver) Unaffected: 6.15.11 , ≤ 6.15.* (semver) Unaffected: 6.16.2 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/gfs2/dir.c",
            "fs/gfs2/glops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "076e992752e4b24178918f748d75597c80a408d2",
              "status": "affected",
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            },
            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "9a0045088d888c9c539c8c626a366cb52c0fbdab",
              "versionType": "git"
            },
            {
              "lessThan": "cddea0c721106ea480371412d8de21705eb27376",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "53a0249d68a210c16e961b83adfa82f94ee0a53d",
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              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
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              "version": "2.6.26"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
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              "version": "6.12.43",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.11",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.16.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2.6.26",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "2.6.26",
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                },
                {
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                {
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                {
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Validate i_depth for exhash directories\n\nA fuzzer test introduced corruption that ends up with a depth of 0 in\ndir_e_read(), causing an undefined shift by 32 at:\n\n  index = hash \u003e\u003e (32 - dip-\u003ei_depth);\n\nAs calculated in an open-coded way in dir_make_exhash(), the minimum\ndepth for an exhash directory is ilog2(sdp-\u003esd_hash_ptrs) and 0 is\ninvalid as sdp-\u003esd_hash_ptrs is fixed as sdp-\u003ebsize / 16 at mount time.\n\nSo we can avoid the undefined behaviour by checking for depth values\nlower than the minimum in gfs2_dinode_in(). Values greater than the\nmaximum are already being checked for there.\n\nAlso switch the calculation in dir_make_exhash() to use ilog2() to\nclarify how the depth is calculated.\n\nTested with the syzkaller repro.c and xfstests \u0027-g quick\u0027."
        }
      ],
      "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The corrupt `di_depth` reaches the kernel only by mounting an attacker-crafted GFS2 volume (loop device, removable media, or a shared cluster LUN), after which the flaw is triggered by ordinary local syscalls (`open`/`stat`/`getdents`) on that mount. GFS2 is a shared-disk filesystem with no network-protocol front end, so there is no remote parser path.\nAC:L - The condition is a deterministic inconsistency the attacker fully authors on disk (`GFS2_DIF_EXHASH` set, `di_depth = 0`, `di_size = 8`), and the out-of-bounds index is chosen exactly by picking a filename whose CRC32 hash equals the desired 32-bit offset. No race, no timing window, and no memory-layout condition outside the attacker\u0027s control.\nPR:L - The bare `mount(2)` needs CAP_SYS_ADMIN (gfs2 lacks FS_USERNS_MOUNT), but in the most severe reasonable deployment an unprivileged user gets the crafted volume mounted through udisks2 loop-setup/removable-media automount or `user`/autofs fstab delegation, and the trigger itself \u2014 a path lookup or `getdents` on the bad directory \u2014 requires only basic unprivileged access to the mount.\nUI:N - In the automount/loop-setup scenario the attacker presents the media and initiates the mount themselves, and at the point of exploitation the out-of-bounds read fires from the attacker\u0027s own `open()`/`stat()` call. No second user has to take any action.\nS:U - The out-of-bounds access, the wild block read, and the hang all occur in GFS2 code inside the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - `get_leaf_nr()` reads a 64-bit word at `hash + 8*index` where `index` is a fully attacker-chosen 32-bit value and the allocation is 8 bytes \u2014 an unbounded slab out-of-bounds read reaching up to 32 GiB past the object, far beyond a \"few bytes\" bounded read. The value read becomes a block number handed to `gfs2_meta_read()`, giving an observable oracle on kernel heap contents through lookup success/failure and the resulting I/O.\nI:H - Out-of-bounds heap data is promoted to a filesystem block number, and `dir_new_leaf()`/`gfs2_dir_add()` then write directory metadata (`oleaf-\u003elf_next`, `be16_add_cpu(\u0026leaf-\u003elf_entries, 1)`) into the buffer for that attacker-influenced block, so kernel-side data read past the object\u0027s bounds steers subsequent metadata writes to arbitrary blocks of the device \u2014 including a shared cluster LUN.\nA:H - A read up to 32 GiB past an 8-byte slab object will typically strike unmapped memory and produce a kernel oops/page fault (KASAN reports it as slab-out-of-bounds), and `dir_e_read()` independently spins forever because `len` truncates to 0 so `index` never advances, wedging `getdents()` while holding the directory glock and stalling the mount \u2014 a full panic on `panic_on_oops` configurations, repeatable on demand."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:04:10.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/366183911b153e9b8cf758e1414e1154d7569337"
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        {
          "url": "https://git.kernel.org/stable/c/112bb60cd0e254a369e95aa9941a694ffeca089f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cddea0c721106ea480371412d8de21705eb27376"
        },
        {
          "url": "https://git.kernel.org/stable/c/53a0249d68a210c16e961b83adfa82f94ee0a53d"
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        },
        {
          "url": "https://git.kernel.org/stable/c/9680c58675b82348ab84d387e4fa727f7587e1a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/557c024ca7250bb65ae60f16c02074106c2f197b"
        }
      ],
      "title": "gfs2: Validate i_depth for exhash directories",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38710",
    "datePublished": "2025-09-04T15:33:00.629Z",
    "dateReserved": "2025-04-16T04:51:24.033Z",
    "dateUpdated": "2026-08-05T12:04:10.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.