CVE-2025-38517 (GCVE-0-2025-38517)
Vulnerability from cvelistv5
Published
2025-08-16 10:55
Modified
2025-08-16 10:55
Severity ?
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]
References
Impacted products
Vendor Product Version
Linux Linux Version: 1438d349d16b78d88f9e978a4a5496f078c8191b
Version: 1438d349d16b78d88f9e978a4a5496f078c8191b
Version: 1438d349d16b78d88f9e978a4a5496f078c8191b
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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              "version": "6.15.7",
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              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "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]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-16T10:55:04.217Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/febc0b5dbabda414565bdfaaaa59d26f787d5fe7"
        },
        {
          "url": "https://git.kernel.org/stable/c/22bf79c0c2301b6e15a688220284b147774d277e"
        },
        {
          "url": "https://git.kernel.org/stable/c/99af22cd34688cc0d535a1919e0bea4cbc6c1ea1"
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      ],
      "title": "lib/alloc_tag: do not acquire non-existent lock in alloc_tag_top_users()",
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38517",
    "datePublished": "2025-08-16T10:55:04.217Z",
    "dateReserved": "2025-04-16T04:51:24.023Z",
    "dateUpdated": "2025-08-16T10:55:04.217Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38517\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-16T11:15:44.897\",\"lastModified\":\"2025-11-18T21:51:11.347\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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]\"},{\"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]\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.10\",\"versionEndExcluding\":\"6.12.39\",\"matchCriteriaId\":\"5E0A7E52-CDBF-45E4-8338-F679910D5C1B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.7\",\"matchCriteriaId\":\"F9C46937-5FA9-4335-AD7B-E7FC29453CE1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"6D4894DB-CCFE-4602-B1BF-3960B2E19A01\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"09709862-E348-4378-8632-5A7813EDDC86\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"415BF58A-8197-43F5-B3D7-D1D63057A26E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A0517869-312D-4429-80C2-561086E1421C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"85421F4E-C863-4ABF-B4B4-E887CC2F7F92\"}]}]}],\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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