CVE-2026-68295 (GCVE-0-2026-68295)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-17 05:02
VLAI
Title
LoongArch: BPF: Zero-extend signed ALU32 div/mod results
Summary
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Zero-extend signed ALU32 div/mod results ALU32 operations write a 32-bit result and leave the upper 32 bits of the BPF register zero. The LoongArch JIT sign-extends the result of signed ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient or remainder leaves bits 63:32 set in JITted code while the verifier and interpreter model those bits as zero. Keep sign-extension on the operands, which signed divide needs, and zero-extend the ALU32 result after the divide or modulo instruction, matching the unsigned ALU32 div/mod paths and every other ALU32 operation in this JIT.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2425c9e002d2a1fdca34261b2fa6713eafef2163 , < 716cb29dbed4d62e9e108950a1a82bcba4cc2d45 (git)
Affected: 2425c9e002d2a1fdca34261b2fa6713eafef2163 , < dacd348b8a993373576fe2ee2d8b114740ba57a6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/net/bpf_jit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "716cb29dbed4d62e9e108950a1a82bcba4cc2d45",
              "status": "affected",
              "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163",
              "versionType": "git"
            },
            {
              "lessThan": "dacd348b8a993373576fe2ee2d8b114740ba57a6",
              "status": "affected",
              "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/net/bpf_jit.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Zero-extend signed ALU32 div/mod results\n\nALU32 operations write a 32-bit result and leave the upper 32 bits of\nthe BPF register zero. The LoongArch JIT sign-extends the result of\nsigned ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient\nor remainder leaves bits 63:32 set in JITted code while the verifier\nand interpreter model those bits as zero.\n\nKeep sign-extension on the operands, which signed divide needs, and\nzero-extend the ALU32 result after the divide or modulo instruction,\nmatching the unsigned ALU32 div/mod paths and every other ALU32\noperation in this JIT."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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 flaw is in the LoongArch eBPF JIT and is reached by loading a BPF program via the bpf(BPF_PROG_LOAD) syscall, which requires local access to the system. No network-facing path emits JITted signed ALU32 div/mod on behalf of a remote peer.\nAC:L - The attacker fully controls the BPF instruction sequence and the divisor/dividend, so producing a negative signed ALU32 quotient or remainder is deterministic and repeatable with no race, timing, or memory-layout dependency.\nPR:L - Loading an eBPF program requires only an unprivileged local user where unprivileged BPF is permitted, or CAP_BPF/CAP_SYS_ADMIN which is reachable via user namespaces on many deployments; no real root in the init namespace is needed.\nUI:N - The attacker loads and runs its own BPF program; no action by any other user or administrator is required at any point.\nS:U - The verifier bypass and resulting memory corruption stay within the kernel\u0027s own security authority on the same host, giving kernel-level privilege escalation rather than crossing a VM, IOMMU, or hypervisor boundary.\nC:H - The verifier models bits 63:32 of the ALU32 result as zero while the JIT leaves them set, so a later ALU64 shift lets the verifier conclude a register is constant zero when it is really 0xFFFFFFFF; using it as a pointer offset yields an attacker-controlled out-of-bounds read of arbitrary kernel memory.\nI:H - The same verifier/JIT range mismatch produces an out-of-bounds pointer that passes verification for stores as well as loads, giving an arbitrary kernel write primitive usable for control-flow hijacking and full privilege escalation.\nA:H - Out-of-bounds accesses through the mis-tracked register readily fault on unmapped or protected kernel addresses, causing an oops or panic, and the corruption can be repeated at will to bring the system down."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:02:31.315Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/716cb29dbed4d62e9e108950a1a82bcba4cc2d45"
        },
        {
          "url": "https://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6"
        }
      ],
      "title": "LoongArch: BPF: Zero-extend signed ALU32 div/mod results",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68295",
    "datePublished": "2026-08-10T12:02:28.412Z",
    "dateReserved": "2026-07-30T09:28:09.380Z",
    "dateUpdated": "2026-08-17T05:02:31.315Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68295",
      "date": "2026-09-21",
      "epss": "0.00154",
      "percentile": "0.04893"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/loongarch/net/bpf_jit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "716cb29dbed4d62e9e108950a1a82bcba4cc2d45",
                    "status": "affected",
                    "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "dacd348b8a993373576fe2ee2d8b114740ba57a6",
                    "status": "affected",
                    "version": "2425c9e002d2a1fdca34261b2fa6713eafef2163",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "arch/loongarch/net/bpf_jit.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.7"
                  },
                  {
                    "lessThan": "6.7",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.1.*",
                    "status": "unaffected",
                    "version": "7.1.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Zero-extend signed ALU32 div/mod results\n\nALU32 operations write a 32-bit result and leave the upper 32 bits of\nthe BPF register zero. The LoongArch JIT sign-extends the result of\nsigned ALU32 BPF_DIV and BPF_MOD (off=1), so a negative 32-bit quotient\nor remainder leaves bits 63:32 set in JITted code while the verifier\nand interpreter model those bits as zero.\n\nKeep sign-extension on the operands, which signed divide needs, and\nzero-extend the ALU32 result after the divide or modulo instruction,\nmatching the unsigned ALU32 div/mod paths and every other ALU32\noperation in this JIT."
          }
        ],
        "id": "CVE-2026-68295",
        "lastModified": "2026-08-17T05:18:32.220",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-10T13:20:18.940",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/716cb29dbed4d62e9e108950a1a82bcba4cc2d45"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:21:21+00:00",
      "cve": "CVE-2026-68295",
      "id": "CVE-2026-68295",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: LoongArch: BPF: Zero-extend signed ALU32 div/mod results",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68295.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:36:53Z",
      "cve": "CVE-2026-68295",
      "id": "CVE-2026-68295",
      "initial_release_date": "2026-08-14T17:14:33Z",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "345",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68295",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68295.json",
      "version": "5"
    }
  }
}



Log in or create an account to share your comment.




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.


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.