{
  "cveId": "CVE-2025-38517",
  "url": "https://patchblox.com/security/cve/CVE-2025-38517",
  "summary": "CVE-2025-38517 is fixed in 23 products on 1 platform, first by ALAS2023-2025-1145, released August 8, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  lib/alloc_tag: do not acquire non-existent lock...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users()  alloc_tag_top_users() attempts to lock alloc_tag_cttype-\u003Emod_lock even when the alloc_tag_cttype is not allocated because:    1) alloc tagging is disabled because mem profiling is disabled      (!alloc_tag_cttype)   2) alloc tagging is enabled, but not yet initialized (!alloc_tag_cttype)   3) alloc tagging is enabled, but failed initialization      (!alloc_tag_cttype or IS_ERR(alloc_tag_cttype))  In all cases, alloc_tag_cttype is not allocated, and therefore alloc_tag_top_users() should not attempt to acquire the semaphore.  This leads to a crash on memory allocation failure by attempting to acquire a non-existent semaphore:    Oops: general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#3] SMP KASAN NOPTI   KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df]   CPU: 2 UID: 0 PID: 1 Comm: systemd Tainted: G      D             6.16.0-rc2 #1 VOLUNTARY   Tainted: [D]=DIE   Hardware name: QEMU Standard PC (i440FX \u002B PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014   RIP: 0010:down_read_trylock\u002B0xaa/0x3b0   Code: d0 7c 08 84 d2 0f 85 a0 02 00 00 8b 0d df 31 dd 04 85 c9 75 29 48 b8 00 00 00 00 00 fc ff df 48 8d 6b 68 48 89 ea 48 c1 ea 03 \u003C80\u003E 3c 02 00 0f 85 88 02 00 00 48 3b 5b 68 0f 85 53 01 00 00 65 ff   RSP: 0000:ffff8881002ce9b8 EFLAGS: 00010016   RAX: dffffc0000000000 RBX: 0000000000000070 RCX: 0000000000000000   RDX: 000000000000001b RSI: 000000000000000a RDI: 0000000000000070   RBP: 00000000000000d8 R08: 0000000000000001 R09: ffffed107dde49d1   R10: ffff8883eef24e8b R11: ffff8881002cec20 R12: 1ffff11020059d37   R13: 00000000003fff7b R14: ffff8881002cec20 R15: dffffc0000000000   FS:  00007f963f21d940(0000) GS:ffff888458ca6000(0000) knlGS:0000000000000000   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   CR2: 00007f963f5edf71 CR3: 000000010672c000 CR4: 0000000000350ef0   Call Trace:    \u003CTASK\u003E    codetag_trylock_module_list\u002B0xd/0x20    alloc_tag_top_users\u002B0x369/0x4b0    __show_mem\u002B0x1cd/0x6e0    warn_alloc\u002B0x2b1/0x390    __alloc_frozen_pages_noprof\u002B0x12b9/0x21a0    alloc_pages_mpol\u002B0x135/0x3e0    alloc_slab_page\u002B0x82/0xe0    new_slab\u002B0x212/0x240    ___slab_alloc\u002B0x82a/0xe00    \u003C/TASK\u003E  As David Wang points out, this issue became easier to trigger after commit 780138b12381 (\u0022alloc_tag: check mem_profiling_support in alloc_tag_init\u0022).  Before the commit, the issue occurred only when it failed to allocate and initialize alloc_tag_cttype or if a memory allocation fails before alloc_tag_init() is called.  After the commit, it can be easily triggered when memory profiling is compiled but disabled at boot.  To properly determine whether alloc_tag_init() has been called and its data structures initialized, verify that alloc_tag_cttype is a valid pointer before acquiring the semaphore.  If the variable is NULL or an error value, it has not been properly initialized.  In such a case, just skip and do not attempt to acquire the semaphore.  [harry.yoo@oracle.com: v3]",
  "published": "2025-08-08T02:59:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00162,
  "epssPercentile": 0.05395,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.40-63.114.amzn2023",
      "fix": "ALAS2023-2025-1145",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1145",
      "released": "2025-08-08T02:59:00Z"
    },
    {
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      "product": "bpftool6.12-debuginfo",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2025-1145",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1145",
      "released": "2025-08-08T02:59:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2025-1145",
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      "released": "2025-08-08T02:59:00Z"
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      "fix": "ALAS2023-2025-1145",
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      "released": "2025-08-08T02:59:00Z"
    },
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      "fix": "ALAS2023-2025-1145",
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      "released": "2025-08-08T02:59:00Z"
    },
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      "fix": "ALAS2023-2025-1145",
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      "released": "2025-08-08T02:59:00Z"
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      "fix": "ALAS2023-2025-1145",
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      "fix": "ALAS2023-2025-1145",
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      "fix": "ALAS2023-2025-1145",
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      "released": "2025-08-08T02:59:00Z"
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      "fix": "ALAS2023-2025-1145",
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      "fix": "ALAS2023-2025-1145",
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      "fix": "ALAS2023-2025-1145",
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    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}