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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.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2022-01-01T00:00:00Z",
          "number": "1",
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          "date": "2026-08-25T12:55:45Z",
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: fix out-of-bounds read when setting HMAC data.\n\nThe SRv6 layer allows defining HMAC data that can later be used to sign IPv6\nSegment Routing Headers. This configuration is realised via netlink through\nfour attributes: SEG6_ATTR_HMACKEYID, SEG6_ATTR_SECRET, SEG6_ATTR_SECRETLEN and\nSEG6_ATTR_ALGID. Because the SECRETLEN attribute is decoupled from the actual\nlength of the SECRET attribute, it is possible to provide invalid combinations\n(e.g., secret = \"\", secretlen = 64). This case is not checked in the code and\nwith an appropriately crafted netlink message, an out-of-bounds read of up\nto 64 bytes (max secret length) can occur past the skb end pointer and into\nskb_shared_info:\n\nBreakpoint 1, seg6_genl_sethmac (skb=<optimized out>, info=<optimized out>) at net/ipv6/seg6.c:208\n208\t\tmemcpy(hinfo->secret, secret, slen);\n(gdb) bt\n #0  seg6_genl_sethmac (skb=<optimized out>, info=<optimized out>) at net/ipv6/seg6.c:208\n #1  0xffffffff81e012e9 in genl_family_rcv_msg_doit (skb=skb@entry=0xffff88800b1f9f00, nlh=nlh@entry=0xffff88800b1b7600,\n    extack=extack@entry=0xffffc90000ba7af0, ops=ops@entry=0xffffc90000ba7a80, hdrlen=4, net=0xffffffff84237580 <init_net>, family=<optimized out>,\n    family=<optimized out>) at net/netlink/genetlink.c:731\n #2  0xffffffff81e01435 in genl_family_rcv_msg (extack=0xffffc90000ba7af0, nlh=0xffff88800b1b7600, skb=0xffff88800b1f9f00,\n    family=0xffffffff82fef6c0 <seg6_genl_family>) at net/netlink/genetlink.c:775\n #3  genl_rcv_msg (skb=0xffff88800b1f9f00, nlh=0xffff88800b1b7600, extack=0xffffc90000ba7af0) at net/netlink/genetlink.c:792\n #4  0xffffffff81dfffc3 in netlink_rcv_skb (skb=skb@entry=0xffff88800b1f9f00, cb=cb@entry=0xffffffff81e01350 <genl_rcv_msg>)\n    at net/netlink/af_netlink.c:2501\n #5  0xffffffff81e00919 in genl_rcv (skb=0xffff88800b1f9f00) at net/netlink/genetlink.c:803\n #6  0xffffffff81dff6ae in netlink_unicast_kernel (ssk=0xffff888010eec800, skb=0xffff88800b1f9f00, sk=0xffff888004aed000)\n    at net/netlink/af_netlink.c:1319\n #7  netlink_unicast (ssk=ssk@entry=0xffff888010eec800, skb=skb@entry=0xffff88800b1f9f00, portid=portid@entry=0, nonblock=<optimized out>)\n    at net/netlink/af_netlink.c:1345\n #8  0xffffffff81dff9a4 in netlink_sendmsg (sock=<optimized out>, msg=0xffffc90000ba7e48, len=<optimized out>) at net/netlink/af_netlink.c:1921\n...\n(gdb) p/x ((struct sk_buff *)0xffff88800b1f9f00)->head + ((struct sk_buff *)0xffff88800b1f9f00)->end\n$1 = 0xffff88800b1b76c0\n(gdb) p/x secret\n$2 = 0xffff88800b1b76c0\n(gdb) p slen\n$3 = 64 '@'\n\nThe OOB data can then be read back from userspace by dumping HMAC state. This\ncommit fixes this by ensuring SECRETLEN cannot exceed the actual length of\nSECRET.",
          "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-2022-48687"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/076f2479fc5a15c4a970ca3b5e57d42ba09a31fa",
          "url": "https://git.kernel.org/stable/c/076f2479fc5a15c4a970ca3b5e57d42ba09a31fa"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3df71e11a4773d775c3633c44319f7acdb89011c",
          "url": "https://git.kernel.org/stable/c/3df71e11a4773d775c3633c44319f7acdb89011c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/55195563ec29f80f984237b743de0e2b6ba4d093",
          "url": "https://git.kernel.org/stable/c/55195563ec29f80f984237b743de0e2b6ba4d093"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/56ad3f475482bca55b0ae544031333018eb145b3",
          "url": "https://git.kernel.org/stable/c/56ad3f475482bca55b0ae544031333018eb145b3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/84a53580c5d2138c7361c7c3eea5b31827e63b35",
          "url": "https://git.kernel.org/stable/c/84a53580c5d2138c7361c7c3eea5b31827e63b35"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/dc9dbd65c803af1607484fed5da50d41dc8dd864",
          "url": "https://git.kernel.org/stable/c/dc9dbd65c803af1607484fed5da50d41dc8dd864"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f684c16971ed5e77dfa25a9ad25b5297e1f58eab",
          "url": "https://git.kernel.org/stable/c/f684c16971ed5e77dfa25a9ad25b5297e1f58eab"
        }
      ],
      "release_date": "2024-05-03T15:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-24T15:08:44.259491Z",
          "details": "Deprioritize: exploitation requires a local process with CAP_NET_ADMIN to invoke the SRv6 generic netlink command (SEG6_CMD_SETHMAC) and read back state, and the path exists only when the kernel is built with SRv6 HMAC support enabled. The bug is a read-only out‑of‑bounds condition capped at 64 bytes from sk_buff metadata, with no code execution, integrity modification, or availability impact. Because this code is exercised only during explicit SRv6 HMAC configuration rather than routine traffic processing, its practical risk in enterprise VM/server contexts is low.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}