CVE-2026-52958 libceph: Fix potential out-of-bounds access in osdmap_decode()

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "net/ceph/osdmap.c"
    ],
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        "version": "5.15.209",
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]