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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)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "arch/loongarch/net/bpf_jit.c"
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        }
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              "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."
            }
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        },
        {
          "url": "https://git.kernel.org/stable/c/dacd348b8a993373576fe2ee2d8b114740ba57a6"
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    "datePublished": "2026-08-10T12:02:28.412Z",
    "dateReserved": "2026-07-30T09:28:09.380Z",
    "dateUpdated": "2026-08-17T05:02:31.315Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "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",
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      "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"
    },
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      "current_release_date": "2026-08-14T23:45:02Z",
      "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": "267",
      "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": "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

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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.