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CVE-2025-39998 (GCVE-0-2025-39998)

Vulnerability from cvelistv5 – Published: 2025-10-15 07:58 – Updated: 2026-08-05 12:07
VLAI
Title
scsi: target: target_core_configfs: Add length check to avoid buffer overflow
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: target: target_core_configfs: Add length check to avoid buffer overflow A buffer overflow arises from the usage of snprintf to write into the buffer "buf" in target_lu_gp_members_show function located in /drivers/target/target_core_configfs.c. This buffer is allocated with size LU_GROUP_NAME_BUF (256 bytes). snprintf(...) formats multiple strings into buf with the HBA name (hba->hba_group.cg_item), a slash character, a devicename (dev-> dev_group.cg_item) and a newline character, the total formatted string length may exceed the buffer size of 256 bytes. Since snprintf() returns the total number of bytes that would have been written (the length of %s/%sn ), this value may exceed the buffer length (256 bytes) passed to memcpy(), this will ultimately cause function memcpy reporting a buffer overflow error. An additional check of the return value of snprintf() can avoid this buffer overflow.
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: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < e6eeee5dc0d9221ff96d1b229b1d0222c8871b84 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 764a91e2fc9639e07aac93bc70e387e6b1e33084 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < ddc79fba132b807ff775467acceaf48b456e008b (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < f03aa5e39da7d045615b3951d2a6ca1d7132f881 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 53c6351597e6a17ec6619f6f060d54128cb9a187 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 4b292286949588bd2818e66ff102db278de8dd26 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < a150275831b765b0f1de8b8ff52ec5c6933ac15d (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 27e06650a5eafe832a90fd2604f0c5e920857fae (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.110 , ≤ 6.6.* (semver)
Unaffected: 6.12.51 , ≤ 6.12.* (semver)
Unaffected: 6.16.11 , ≤ 6.16.* (semver)
Unaffected: 6.17.1 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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              "value": "AV:L - The vulnerability is triggered by read(2) on a configfs attribute file at /sys/kernel/config/target/core/alua/lu_gps/\u003cgp\u003e/members, which requires local access to the system. There is no network-facing path into target_lu_gp_members_show().\nAC:L - The over-read is fully deterministic \u2014 once an HBA+device name pair exceeding 255 combined characters exists, every read of the members file executes memcpy() with a length larger than the 256-byte stack source, with no race or memory-layout dependency.\nPR:L - The members attribute is CONFIGFS_ATTR_RO (mode 0444) under 0755 configfs directories, so any unprivileged local account \u2014 or a container with /sys bind-mounted read-only \u2014 can perform the triggering read; only the pre-existing long backstore name is admin-created state, not a privilege the attacker must hold.\nUI:N - Exploitation is a single read() by the attacker with no victim action required. No administrator or other user must be induced to do anything at exploit time.\nS:U - The out-of-bounds read and the resulting disclosure/panic are confined to the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Up to ~65 bytes of kernel stack memory adjacent to buf[256] are copied into the configfs page and returned to userspace, plausibly leaking the stack canary, saved registers, and kernel/list pointers that defeat KASLR and stack protector. This is well beyond a \"few bytes\" bounded read.\nI:N - The (cur_len + len) \u003e PAGE_SIZE check correctly bounds the memcpy destination inside the get_zeroed_page() buffer, so no kernel memory is written out of bounds and no write or control-flow primitive is produced.\nA:H - With CONFIG_FORTIFY_SOURCE (default in distro kernels) the runtime source-size check in fortify_memcpy_chk() fires and calls fortify_panic(), producing a kernel BUG/panic; KASAN builds BUG as well, and the attacker can trigger this at will by re-reading the file."
            }
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    "datePublished": "2025-10-15T07:58:22.354Z",
    "dateReserved": "2025-04-16T07:20:57.151Z",
    "dateUpdated": "2026-08-05T12:07:00.453Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2025-39998",
      "date": "2026-09-20",
      "epss": "0.00173",
      "percentile": "0.07084"
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    "microsoft_vex": {
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      "cve": "CVE-2025-39998",
      "id": "msrc_CVE-2025-39998",
      "initial_release_date": "2025-10-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "scsi: target: target_core_configfs: Add length check to avoid buffer overflow",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-39998.json",
      "version": "1"
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    "nvd": {
      "cve": {
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          }
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: target_core_configfs: Add length check to avoid buffer overflow\n\nA buffer overflow arises from the usage of snprintf to write into the\nbuffer \"buf\" in target_lu_gp_members_show function located in\n/drivers/target/target_core_configfs.c. This buffer is allocated with\nsize LU_GROUP_NAME_BUF (256 bytes).\n\nsnprintf(...) formats multiple strings into buf with the HBA name\n(hba-\u003ehba_group.cg_item), a slash character, a devicename (dev-\u003e\ndev_group.cg_item) and a newline character, the total formatted string\nlength may exceed the buffer size of 256 bytes.\n\nSince snprintf() returns the total number of bytes that would have been\nwritten (the length of %s/%sn ), this value may exceed the buffer length\n(256 bytes) passed to memcpy(), this will ultimately cause function\nmemcpy reporting a buffer overflow error.\n\nAn additional check of the return value of snprintf() can avoid this\nbuffer overflow."
          }
        ],
        "id": "CVE-2025-39998",
        "lastModified": "2026-07-30T06:24:05.717",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2025-10-15T08:15:38.077",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/27e06650a5eafe832a90fd2604f0c5e920857fae"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4b292286949588bd2818e66ff102db278de8dd26"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/53c6351597e6a17ec6619f6f060d54128cb9a187"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/764a91e2fc9639e07aac93bc70e387e6b1e33084"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a150275831b765b0f1de8b8ff52ec5c6933ac15d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ddc79fba132b807ff775467acceaf48b456e008b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e6eeee5dc0d9221ff96d1b229b1d0222c8871b84"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e73fe0eefac3e15bf88fb5b4afae4c76215ee4d4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f03aa5e39da7d045615b3951d2a6ca1d7132f881"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:53:23+00:00",
      "cve": "CVE-2025-39998",
      "id": "CVE-2025-39998",
      "initial_release_date": "2025-10-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Buffer overflow in target_lu_gp_members_show can lead to arbitrary code execution",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39998.json",
      "version": "3"
    }
  }
}



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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.