CVE-2025-38517 (GCVE-0-2025-38517)

Vulnerability from cvelistv5 – Published: 2025-08-16 10:55 – Updated: 2026-05-11 21:29
VLAI
Title
lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users()
Summary
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->mod_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 + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:down_read_trylock+0xaa/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 <80> 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: <TASK> codetag_trylock_module_list+0xd/0x20 alloc_tag_top_users+0x369/0x4b0 __show_mem+0x1cd/0x6e0 warn_alloc+0x2b1/0x390 __alloc_frozen_pages_noprof+0x12b9/0x21a0 alloc_pages_mpol+0x135/0x3e0 alloc_slab_page+0x82/0xe0 new_slab+0x212/0x240 ___slab_alloc+0x82a/0xe00 </TASK> As David Wang points out, this issue became easier to trigger after commit 780138b12381 ("alloc_tag: check mem_profiling_support in alloc_tag_init"). 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]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1438d349d16b78d88f9e978a4a5496f078c8191b , < febc0b5dbabda414565bdfaaaa59d26f787d5fe7 (git)
Affected: 1438d349d16b78d88f9e978a4a5496f078c8191b , < 22bf79c0c2301b6e15a688220284b147774d277e (git)
Affected: 1438d349d16b78d88f9e978a4a5496f078c8191b , < 99af22cd34688cc0d535a1919e0bea4cbc6c1ea1 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users()\n\nalloc_tag_top_users() attempts to lock alloc_tag_cttype-\u003emod_lock even\nwhen the alloc_tag_cttype is not allocated because:\n\n  1) alloc tagging is disabled because mem profiling is disabled\n     (!alloc_tag_cttype)\n  2) alloc tagging is enabled, but not yet initialized (!alloc_tag_cttype)\n  3) alloc tagging is enabled, but failed initialization\n     (!alloc_tag_cttype or IS_ERR(alloc_tag_cttype))\n\nIn all cases, alloc_tag_cttype is not allocated, and therefore\nalloc_tag_top_users() should not attempt to acquire the semaphore.\n\nThis leads to a crash on memory allocation failure by attempting to\nacquire a non-existent semaphore:\n\n  Oops: general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#3] SMP KASAN NOPTI\n  KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df]\n  CPU: 2 UID: 0 PID: 1 Comm: systemd Tainted: G      D             6.16.0-rc2 #1 VOLUNTARY\n  Tainted: [D]=DIE\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\n  RIP: 0010:down_read_trylock+0xaa/0x3b0\n  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\n  RSP: 0000:ffff8881002ce9b8 EFLAGS: 00010016\n  RAX: dffffc0000000000 RBX: 0000000000000070 RCX: 0000000000000000\n  RDX: 000000000000001b RSI: 000000000000000a RDI: 0000000000000070\n  RBP: 00000000000000d8 R08: 0000000000000001 R09: ffffed107dde49d1\n  R10: ffff8883eef24e8b R11: ffff8881002cec20 R12: 1ffff11020059d37\n  R13: 00000000003fff7b R14: ffff8881002cec20 R15: dffffc0000000000\n  FS:  00007f963f21d940(0000) GS:ffff888458ca6000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f963f5edf71 CR3: 000000010672c000 CR4: 0000000000350ef0\n  Call Trace:\n   \u003cTASK\u003e\n   codetag_trylock_module_list+0xd/0x20\n   alloc_tag_top_users+0x369/0x4b0\n   __show_mem+0x1cd/0x6e0\n   warn_alloc+0x2b1/0x390\n   __alloc_frozen_pages_noprof+0x12b9/0x21a0\n   alloc_pages_mpol+0x135/0x3e0\n   alloc_slab_page+0x82/0xe0\n   new_slab+0x212/0x240\n   ___slab_alloc+0x82a/0xe00\n   \u003c/TASK\u003e\n\nAs David Wang points out, this issue became easier to trigger after commit\n780138b12381 (\"alloc_tag: check mem_profiling_support in alloc_tag_init\").\n\nBefore the commit, the issue occurred only when it failed to allocate and\ninitialize alloc_tag_cttype or if a memory allocation fails before\nalloc_tag_init() is called.  After the commit, it can be easily triggered\nwhen memory profiling is compiled but disabled at boot.\n\nTo properly determine whether alloc_tag_init() has been called and its\ndata structures initialized, verify that alloc_tag_cttype is a valid\npointer before acquiring the semaphore.  If the variable is NULL or an\nerror value, it has not been properly initialized.  In such a case, just\nskip and do not attempt to acquire the semaphore.\n\n[harry.yoo@oracle.com: v3]"
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: lib/alloc_tag: no adquiere un bloqueo inexistente en alloc_tag_top_users() alloc_tag_top_users() intenta bloquear alloc_tag_cttype-\u0026gt;mod_lock incluso cuando alloc_tag_cttype no est\u00e1 asignado porque: 1) el etiquetado de asignaci\u00f3n est\u00e1 deshabilitado porque el perfil de memoria est\u00e1 deshabilitado (!alloc_tag_cttype) 2) el etiquetado de asignaci\u00f3n est\u00e1 habilitado, pero a\u00fan no se ha inicializado (!alloc_tag_cttype) 3) el etiquetado de asignaci\u00f3n est\u00e1 habilitado, pero fall\u00f3 la inicializaci\u00f3n (!alloc_tag_cttype o IS_ERR(alloc_tag_cttype)) En todos los casos, alloc_tag_cttype no est\u00e1 asignado y, por lo tanto, alloc_tag_top_users() no debe intentar adquirir el sem\u00e1foro. Esto genera un bloqueo por un error de asignaci\u00f3n de memoria al intentar adquirir un sem\u00e1foro inexistente: Oops: error de protecci\u00f3n general, probablemente para una direcci\u00f3n no can\u00f3nica 0xdffffc000000001b: 0000 [#3] SMP KASAN NOPTI KASAN: null-ptr-deref en el rango [0x0000000000000d8-0x00000000000000df] CPU: 2 UID: 0 PID: 1 Comm: systemd Tainted: GD 6.16.0-rc2 #1 VOLUNTARY Tainted: [D]=DIE Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:down_read_trylock+0xaa/0x3b0 C\u00f3digo: 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 \u0026lt;80\u0026gt; 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: 0000000000000001b 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:000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f963f5edf71 CR3: 000000010672c000 CR4: 0000000000350ef0 Rastreo de llamadas:  codetag_trylock_module_list+0xd/0x20 Como se\u00f1ala David Wang, este problema se volvi\u00f3 m\u00e1s f\u00e1cil de activar despu\u00e9s de el commit 780138b12381 (\"alloc_tag: verificar mem_profiling_support en alloc_tag_init\"). Antes de el commit, el problema solo ocurr\u00eda cuando no se asignaba ni inicializaba alloc_tag_cttype o si fallaba la asignaci\u00f3n de memoria antes de llamar a alloc_tag_init(). Despu\u00e9s de el commit, se puede activar f\u00e1cilmente cuando el perfilado de memoria se compila, pero se deshabilita al arrancar. Para determinar correctamente si se ha llamado a alloc_tag_init() y si se han inicializado sus estructuras de datos, verifique que alloc_tag_cttype sea un puntero v\u00e1lido antes de adquirir el sem\u00e1foro. Si la variable es NULL o un valor de error, no se ha inicializado correctamente. En tal caso, simplemente omita este paso y no intente adquirir el sem\u00e1foro. [harry.yoo@oracle.com: v3]"
          }
        ],
        "id": "CVE-2025-38517",
        "lastModified": "2026-06-17T09:17:01.753",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "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"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-08-16T11:15:44.897",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/22bf79c0c2301b6e15a688220284b147774d277e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/99af22cd34688cc0d535a1919e0bea4cbc6c1ea1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/febc0b5dbabda414565bdfaaaa59d26f787d5fe7"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:09:49+00:00",
      "cve": "CVE-2025-38517",
      "id": "CVE-2025-38517",
      "initial_release_date": "2025-08-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38517.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:54:12Z",
      "cve": "CVE-2025-38517",
      "id": "CVE-2025-38517",
      "initial_release_date": "2025-08-16T23:22:54Z",
      "product_status:known_not_affected": "578",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38517",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38517.json",
      "version": "8"
    }
  }
}



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