CVE-2025-40079 (GCVE-0-2025-40079)
Vulnerability from cvelistv5
Published
2025-10-28 11:48
Modified
2025-10-28 11:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Sign extend struct ops return values properly The ns_bpf_qdisc selftest triggers a kernel panic: Unable to handle kernel paging request at virtual address ffffffffa38dbf58 Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000 [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000 Oops [#1] Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)] CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G W OE 6.17.0-rc1-g2465bb83e0b4 #1 NONE Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024 epc : __qdisc_run+0x82/0x6f0 ra : __qdisc_run+0x6e/0x6f0 epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550 gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180 t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0 s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001 a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000 a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049 s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000 s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0 s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000 s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000 t5 : 0000000000000000 t6 : ff60000093a6a8b6 status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d [<ffffffff80bd5c7a>] __qdisc_run+0x82/0x6f0 [<ffffffff80b6fe58>] __dev_queue_xmit+0x4c0/0x1128 [<ffffffff80b80ae0>] neigh_resolve_output+0xd0/0x170 [<ffffffff80d2daf6>] ip6_finish_output2+0x226/0x6c8 [<ffffffff80d31254>] ip6_finish_output+0x10c/0x2a0 [<ffffffff80d31446>] ip6_output+0x5e/0x178 [<ffffffff80d2e232>] ip6_xmit+0x29a/0x608 [<ffffffff80d6f4c6>] inet6_csk_xmit+0xe6/0x140 [<ffffffff80c985e4>] __tcp_transmit_skb+0x45c/0xaa8 [<ffffffff80c995fe>] tcp_connect+0x9ce/0xd10 [<ffffffff80d66524>] tcp_v6_connect+0x4ac/0x5e8 [<ffffffff80cc19b8>] __inet_stream_connect+0xd8/0x318 [<ffffffff80cc1c36>] inet_stream_connect+0x3e/0x68 [<ffffffff80b42b20>] __sys_connect_file+0x50/0x88 [<ffffffff80b42bee>] __sys_connect+0x96/0xc8 [<ffffffff80b42c40>] __riscv_sys_connect+0x20/0x30 [<ffffffff80e5bcae>] do_trap_ecall_u+0x256/0x378 [<ffffffff80e69af2>] handle_exception+0x14a/0x156 Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709 ---[ end trace 0000000000000000 ]--- The bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer is treated as a 32bit value and sign extend to 64bit in epilogue. This behavior is right for most bpf prog types but wrong for struct ops which requires RISC-V ABI. So let's sign extend struct ops return values according to the function model and RISC-V ABI([0]). [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf
References
Impacted products
Vendor Product Version
Linux Linux Version: 25ad10658dc1068a671553ff10e19a812c2a3783
Version: 25ad10658dc1068a671553ff10e19a812c2a3783
Version: 25ad10658dc1068a671553ff10e19a812c2a3783
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/net/bpf_jit_comp64.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "92751937f12a7d34ad492577a251c94a55e97e72",
              "status": "affected",
              "version": "25ad10658dc1068a671553ff10e19a812c2a3783",
              "versionType": "git"
            },
            {
              "lessThan": "918a399501e28e0cc36dbd1fcfb4208f8aa1e4d1",
              "status": "affected",
              "version": "25ad10658dc1068a671553ff10e19a812c2a3783",
              "versionType": "git"
            },
            {
              "lessThan": "fd2e08128944a7679e753f920e9eda72057e427c",
              "status": "affected",
              "version": "25ad10658dc1068a671553ff10e19a812c2a3783",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/net/bpf_jit_comp64.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.53",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc1",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv, bpf: Sign extend struct ops return values properly\n\nThe ns_bpf_qdisc selftest triggers a kernel panic:\n\n    Unable to handle kernel paging request at virtual address ffffffffa38dbf58\n    Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000\n    [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000\n    Oops [#1]\n    Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)]\n    CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G        W  OE       6.17.0-rc1-g2465bb83e0b4 #1 NONE\n    Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\n    Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024\n    epc : __qdisc_run+0x82/0x6f0\n     ra : __qdisc_run+0x6e/0x6f0\n    epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550\n     gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180\n     t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0\n     s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001\n     a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000\n     a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049\n     s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000\n     s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0\n     s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000\n     s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000\n     t5 : 0000000000000000 t6 : ff60000093a6a8b6\n    status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d\n    [\u003cffffffff80bd5c7a\u003e] __qdisc_run+0x82/0x6f0\n    [\u003cffffffff80b6fe58\u003e] __dev_queue_xmit+0x4c0/0x1128\n    [\u003cffffffff80b80ae0\u003e] neigh_resolve_output+0xd0/0x170\n    [\u003cffffffff80d2daf6\u003e] ip6_finish_output2+0x226/0x6c8\n    [\u003cffffffff80d31254\u003e] ip6_finish_output+0x10c/0x2a0\n    [\u003cffffffff80d31446\u003e] ip6_output+0x5e/0x178\n    [\u003cffffffff80d2e232\u003e] ip6_xmit+0x29a/0x608\n    [\u003cffffffff80d6f4c6\u003e] inet6_csk_xmit+0xe6/0x140\n    [\u003cffffffff80c985e4\u003e] __tcp_transmit_skb+0x45c/0xaa8\n    [\u003cffffffff80c995fe\u003e] tcp_connect+0x9ce/0xd10\n    [\u003cffffffff80d66524\u003e] tcp_v6_connect+0x4ac/0x5e8\n    [\u003cffffffff80cc19b8\u003e] __inet_stream_connect+0xd8/0x318\n    [\u003cffffffff80cc1c36\u003e] inet_stream_connect+0x3e/0x68\n    [\u003cffffffff80b42b20\u003e] __sys_connect_file+0x50/0x88\n    [\u003cffffffff80b42bee\u003e] __sys_connect+0x96/0xc8\n    [\u003cffffffff80b42c40\u003e] __riscv_sys_connect+0x20/0x30\n    [\u003cffffffff80e5bcae\u003e] do_trap_ecall_u+0x256/0x378\n    [\u003cffffffff80e69af2\u003e] handle_exception+0x14a/0x156\n    Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709\n    ---[ end trace 0000000000000000 ]---\n\nThe bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer\nis treated as a 32bit value and sign extend to 64bit in epilogue. This\nbehavior is right for most bpf prog types but wrong for struct ops which\nrequires RISC-V ABI.\n\nSo let\u0027s sign extend struct ops return values according to the function\nmodel and RISC-V ABI([0]).\n\n  [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-28T11:48:44.122Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/92751937f12a7d34ad492577a251c94a55e97e72"
        },
        {
          "url": "https://git.kernel.org/stable/c/918a399501e28e0cc36dbd1fcfb4208f8aa1e4d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd2e08128944a7679e753f920e9eda72057e427c"
        }
      ],
      "title": "riscv, bpf: Sign extend struct ops return values properly",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40079",
    "datePublished": "2025-10-28T11:48:44.122Z",
    "dateReserved": "2025-04-16T07:20:57.160Z",
    "dateUpdated": "2025-10-28T11:48:44.122Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40079\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T12:15:42.480\",\"lastModified\":\"2025-10-30T15:05:32.197\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nriscv, bpf: Sign extend struct ops return values properly\\n\\nThe ns_bpf_qdisc selftest triggers a kernel panic:\\n\\n    Unable to handle kernel paging request at virtual address ffffffffa38dbf58\\n    Current test_progs pgtable: 4K pagesize, 57-bit VAs, pgdp=0x00000001109cc000\\n    [ffffffffa38dbf58] pgd=000000011fffd801, p4d=000000011fffd401, pud=000000011fffd001, pmd=0000000000000000\\n    Oops [#1]\\n    Modules linked in: bpf_testmod(OE) xt_conntrack nls_iso8859_1 [...] [last unloaded: bpf_testmod(OE)]\\n    CPU: 1 UID: 0 PID: 23584 Comm: test_progs Tainted: G        W  OE       6.17.0-rc1-g2465bb83e0b4 #1 NONE\\n    Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\\n    Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2024.01+dfsg-1ubuntu5.1 01/01/2024\\n    epc : __qdisc_run+0x82/0x6f0\\n     ra : __qdisc_run+0x6e/0x6f0\\n    epc : ffffffff80bd5c7a ra : ffffffff80bd5c66 sp : ff2000000eecb550\\n     gp : ffffffff82472098 tp : ff60000096895940 t0 : ffffffff8001f180\\n     t1 : ffffffff801e1664 t2 : 0000000000000000 s0 : ff2000000eecb5d0\\n     s1 : ff60000093a6a600 a0 : ffffffffa38dbee8 a1 : 0000000000000001\\n     a2 : ff2000000eecb510 a3 : 0000000000000001 a4 : 0000000000000000\\n     a5 : 0000000000000010 a6 : 0000000000000000 a7 : 0000000000735049\\n     s2 : ffffffffa38dbee8 s3 : 0000000000000040 s4 : ff6000008bcda000\\n     s5 : 0000000000000008 s6 : ff60000093a6a680 s7 : ff60000093a6a6f0\\n     s8 : ff60000093a6a6ac s9 : ff60000093140000 s10: 0000000000000000\\n     s11: ff2000000eecb9d0 t3 : 0000000000000000 t4 : 0000000000ff0000\\n     t5 : 0000000000000000 t6 : ff60000093a6a8b6\\n    status: 0000000200000120 badaddr: ffffffffa38dbf58 cause: 000000000000000d\\n    [\u003cffffffff80bd5c7a\u003e] __qdisc_run+0x82/0x6f0\\n    [\u003cffffffff80b6fe58\u003e] __dev_queue_xmit+0x4c0/0x1128\\n    [\u003cffffffff80b80ae0\u003e] neigh_resolve_output+0xd0/0x170\\n    [\u003cffffffff80d2daf6\u003e] ip6_finish_output2+0x226/0x6c8\\n    [\u003cffffffff80d31254\u003e] ip6_finish_output+0x10c/0x2a0\\n    [\u003cffffffff80d31446\u003e] ip6_output+0x5e/0x178\\n    [\u003cffffffff80d2e232\u003e] ip6_xmit+0x29a/0x608\\n    [\u003cffffffff80d6f4c6\u003e] inet6_csk_xmit+0xe6/0x140\\n    [\u003cffffffff80c985e4\u003e] __tcp_transmit_skb+0x45c/0xaa8\\n    [\u003cffffffff80c995fe\u003e] tcp_connect+0x9ce/0xd10\\n    [\u003cffffffff80d66524\u003e] tcp_v6_connect+0x4ac/0x5e8\\n    [\u003cffffffff80cc19b8\u003e] __inet_stream_connect+0xd8/0x318\\n    [\u003cffffffff80cc1c36\u003e] inet_stream_connect+0x3e/0x68\\n    [\u003cffffffff80b42b20\u003e] __sys_connect_file+0x50/0x88\\n    [\u003cffffffff80b42bee\u003e] __sys_connect+0x96/0xc8\\n    [\u003cffffffff80b42c40\u003e] __riscv_sys_connect+0x20/0x30\\n    [\u003cffffffff80e5bcae\u003e] do_trap_ecall_u+0x256/0x378\\n    [\u003cffffffff80e69af2\u003e] handle_exception+0x14a/0x156\\n    Code: 892a 0363 1205 489c 8bc1 c7e5 2d03 084a 2703 080a (2783) 0709\\n    ---[ end trace 0000000000000000 ]---\\n\\nThe bpf_fifo_dequeue prog returns a skb which is a pointer. The pointer\\nis treated as a 32bit value and sign extend to 64bit in epilogue. This\\nbehavior is right for most bpf prog types but wrong for struct ops which\\nrequires RISC-V ABI.\\n\\nSo let\u0027s sign extend struct ops return values according to the function\\nmodel and RISC-V ABI([0]).\\n\\n  [0]: https://riscv.org/wp-content/uploads/2024/12/riscv-calling.pdf\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/918a399501e28e0cc36dbd1fcfb4208f8aa1e4d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/92751937f12a7d34ad492577a251c94a55e97e72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fd2e08128944a7679e753f920e9eda72057e427c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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