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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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        "summary": "Canonical URL",
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          "date": "2026-04-22T13:54:25Z",
          "number": "1",
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix double-free of smc_spd_priv when tee() duplicates splice pipe buffer\n\nsmc_rx_splice() allocates one smc_spd_priv per pipe_buffer and stores\nthe pointer in pipe_buffer.private.  The pipe_buf_operations for these\nbuffers used .get = generic_pipe_buf_get, which only increments the page\nreference count when tee(2) duplicates a pipe buffer.  The smc_spd_priv\npointer itself was not handled, so after tee() both the original and the\ncloned pipe_buffer share the same smc_spd_priv *.\n\nWhen both pipes are subsequently released, smc_rx_pipe_buf_release() is\ncalled twice against the same object:\n\n  1st call: kfree(priv)  sock_put(sk)  smc_rx_update_cons()  [correct]\n  2nd call: kfree(priv)  sock_put(sk)  smc_rx_update_cons()  [UAF]\n\nKASAN reports a slab-use-after-free in smc_rx_pipe_buf_release(), which\nthen escalates to a NULL-pointer dereference and kernel panic via\nsmc_rx_update_consumer() when it chases the freed priv->smc pointer:\n\n  BUG: KASAN: slab-use-after-free in smc_rx_pipe_buf_release+0x78/0x2a0\n  Read of size 8 at addr ffff888004a45740 by task smc_splice_tee_/74\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x53/0x70\n   print_report+0xce/0x650\n   kasan_report+0xc6/0x100\n   smc_rx_pipe_buf_release+0x78/0x2a0\n   free_pipe_info+0xd4/0x130\n   pipe_release+0x142/0x160\n   __fput+0x1c6/0x490\n   __x64_sys_close+0x4f/0x90\n   do_syscall_64+0xa6/0x1a0\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   </TASK>\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000020\n  RIP: 0010:smc_rx_update_consumer+0x8d/0x350\n  Call Trace:\n   <TASK>\n   smc_rx_pipe_buf_release+0x121/0x2a0\n   free_pipe_info+0xd4/0x130\n   pipe_release+0x142/0x160\n   __fput+0x1c6/0x490\n   __x64_sys_close+0x4f/0x90\n   do_syscall_64+0xa6/0x1a0\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n   </TASK>\n  Kernel panic - not syncing: Fatal exception\n\nBeyond the memory-safety problem, duplicating an SMC splice buffer is\nsemantically questionable: smc_rx_update_cons() would advance the\nconsumer cursor twice for the same data, corrupting receive-window\naccounting.  A refcount on smc_spd_priv could fix the double-free, but\nthe cursor-accounting issue would still need to be addressed separately.\n\nThe .get callback is invoked by both tee(2) and splice_pipe_to_pipe()\nfor partial transfers; both will now return -EFAULT.  Users who need\nto duplicate SMC socket data must use a copy-based read path.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-31507"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/24dd586bb4cbba1889a50abe74143817a095c1c9",
          "url": "https://git.kernel.org/stable/c/24dd586bb4cbba1889a50abe74143817a095c1c9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3cc76380fea749280c026f410af56a28aaac388a",
          "url": "https://git.kernel.org/stable/c/3cc76380fea749280c026f410af56a28aaac388a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/54c87a730157868543ebdfa0ecb21b4590ed23a5",
          "url": "https://git.kernel.org/stable/c/54c87a730157868543ebdfa0ecb21b4590ed23a5"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7bcb974c771c863e8588cea0012ac204443a7126",
          "url": "https://git.kernel.org/stable/c/7bcb974c771c863e8588cea0012ac204443a7126"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7e8916f46c2f48607f907fd401590093753a6bc5",
          "url": "https://git.kernel.org/stable/c/7e8916f46c2f48607f907fd401590093753a6bc5"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/81acbd345d405994875d419d43b319fee0b9ad62",
          "url": "https://git.kernel.org/stable/c/81acbd345d405994875d419d43b319fee0b9ad62"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/98ba5cb274768146e25ffbfde47753652c1c20d3",
          "url": "https://git.kernel.org/stable/c/98ba5cb274768146e25ffbfde47753652c1c20d3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ae5575e660410c8d2c5d38fb28a0f37aea945676",
          "url": "https://git.kernel.org/stable/c/ae5575e660410c8d2c5d38fb28a0f37aea945676"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
        }
      ],
      "release_date": "2026-04-22T13:54:25Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:23:09.874932Z",
          "details": "This is a local-only denial-of-service in the SMC receive splice path that is triggered when a local process duplicates SMC pipe buffers via tee()/splice, leading to a kernel panic but no confidentiality or integrity impact. The vulnerable code is reachable only when SMC-R/SMC-D is actively in use (i.e., SMC enabled with suitable RDMA/ISM support); without an established SMC data path, connections fall back to non‑SMC handling and this path is not exercised. Given the need for local code execution against an SMC socket and the availability-only effect, this issue can be safely deprioritized for typical enterprise server and VM deployments.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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      "threats": [
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          "category": "impact",
          "details": "Moderate"
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    }
  ]
}