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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": "2025-02-27T02:18:32Z",
          "number": "1",
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          "date": "2026-08-25T12:54:03Z",
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: clear acl_access/acl_default after releasing them\n\nIf getting acl_default fails, acl_access and acl_default will be released\nsimultaneously. However, acl_access will still retain a pointer pointing\nto the released posix_acl, which will trigger a WARNING in\nnfs3svc_release_getacl like this:\n\n------------[ cut here ]------------\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 26 PID: 3199 at lib/refcount.c:28\nrefcount_warn_saturate+0xb5/0x170\nModules linked in:\nCPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted\n6.12.0-rc6-00079-g04ae226af01f-dirty #8\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb5/0x170\nCode: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75\ne4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff <0f> 0b eb\ncd 0f b6 1d 8a3\nRSP: 0018:ffffc90008637cd8 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380\nRBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56\nR10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001\nR13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0\nFS:  0000000000000000(0000) GS:ffff88871ed00000(0000)\nknlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n ? refcount_warn_saturate+0xb5/0x170\n ? __warn+0xa5/0x140\n ? refcount_warn_saturate+0xb5/0x170\n ? report_bug+0x1b1/0x1e0\n ? handle_bug+0x53/0xa0\n ? exc_invalid_op+0x17/0x40\n ? asm_exc_invalid_op+0x1a/0x20\n ? tick_nohz_tick_stopped+0x1e/0x40\n ? refcount_warn_saturate+0xb5/0x170\n ? refcount_warn_saturate+0xb5/0x170\n nfs3svc_release_getacl+0xc9/0xe0\n svc_process_common+0x5db/0xb60\n ? __pfx_svc_process_common+0x10/0x10\n ? __rcu_read_unlock+0x69/0xa0\n ? __pfx_nfsd_dispatch+0x10/0x10\n ? svc_xprt_received+0xa1/0x120\n ? xdr_init_decode+0x11d/0x190\n svc_process+0x2a7/0x330\n svc_handle_xprt+0x69d/0x940\n svc_recv+0x180/0x2d0\n nfsd+0x168/0x200\n ? __pfx_nfsd+0x10/0x10\n kthread+0x1a2/0x1e0\n ? kthread+0xf4/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x60\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\nKernel panic - not syncing: kernel: panic_on_warn set ...\n\nClear acl_access/acl_default after posix_acl_release is called to prevent\nUAF from being triggered.",
          "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-2025-21796"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1fd94884174bd20beb1773990fd3b1aa877688d9",
          "url": "https://git.kernel.org/stable/c/1fd94884174bd20beb1773990fd3b1aa877688d9"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/2e59b2b68782519560b3d6a41dd66a3d01a01cd3",
          "url": "https://git.kernel.org/stable/c/2e59b2b68782519560b3d6a41dd66a3d01a01cd3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/55d947315fb5f67a35e4e1d3e01bb886b9c6decf",
          "url": "https://git.kernel.org/stable/c/55d947315fb5f67a35e4e1d3e01bb886b9c6decf"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6f7cfee1a316891890c505563aa54f3476db52fd",
          "url": "https://git.kernel.org/stable/c/6f7cfee1a316891890c505563aa54f3476db52fd"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7faf14a7b0366f153284db0ad3347c457ea70136",
          "url": "https://git.kernel.org/stable/c/7faf14a7b0366f153284db0ad3347c457ea70136"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/8a1737ae42c928384ab6447f6ee1a882510e85fa",
          "url": "https://git.kernel.org/stable/c/8a1737ae42c928384ab6447f6ee1a882510e85fa"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f8d871523142f7895f250a856f8c4a4181614510",
          "url": "https://git.kernel.org/stable/c/f8d871523142f7895f250a856f8c4a4181614510"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
        },
        {
          "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"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
        }
      ],
      "release_date": "2025-02-27T02:18:32Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:17:38.708672Z",
          "details": "Risk is constrained to hosts running the in‑kernel NFS server with the legacy NFSv2/3 POSIX ACL program enabled; systems not running nfsd or using only NFSv4 ACLs are unaffected. The bug occurs in an error‑handling path during ACL retrieval and leads to a WARN/DoS only, with a kernel panic possible only if the non‑default panic_on_warn setting is enabled. Given the local/low‑privilege vector, the narrow feature preconditions, and no confidentiality or integrity impact, this issue can be safely deprioritized in enterprise VM/server environments.",
          "product_ids": [
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            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
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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"
          },
          "products": [
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}