CVE-2025-21796 (GCVE-0-2025-21796)
Vulnerability from cvelistv5
Published
2025-02-27 02:18
Modified
2025-05-04 07:21
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: clear acl_access/acl_default after releasing them If getting acl_default fails, acl_access and acl_default will be released simultaneously. However, acl_access will still retain a pointer pointing to the released posix_acl, which will trigger a WARNING in nfs3svc_release_getacl like this: ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 26 PID: 3199 at lib/refcount.c:28 refcount_warn_saturate+0xb5/0x170 Modules linked in: CPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted 6.12.0-rc6-00079-g04ae226af01f-dirty #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb5/0x170 Code: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75 e4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff <0f> 0b eb cd 0f b6 1d 8a3 RSP: 0018:ffffc90008637cd8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380 RBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56 R10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0 FS: 0000000000000000(0000) GS:ffff88871ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ? refcount_warn_saturate+0xb5/0x170 ? __warn+0xa5/0x140 ? refcount_warn_saturate+0xb5/0x170 ? report_bug+0x1b1/0x1e0 ? handle_bug+0x53/0xa0 ? exc_invalid_op+0x17/0x40 ? asm_exc_invalid_op+0x1a/0x20 ? tick_nohz_tick_stopped+0x1e/0x40 ? refcount_warn_saturate+0xb5/0x170 ? refcount_warn_saturate+0xb5/0x170 nfs3svc_release_getacl+0xc9/0xe0 svc_process_common+0x5db/0xb60 ? __pfx_svc_process_common+0x10/0x10 ? __rcu_read_unlock+0x69/0xa0 ? __pfx_nfsd_dispatch+0x10/0x10 ? svc_xprt_received+0xa1/0x120 ? xdr_init_decode+0x11d/0x190 svc_process+0x2a7/0x330 svc_handle_xprt+0x69d/0x940 svc_recv+0x180/0x2d0 nfsd+0x168/0x200 ? __pfx_nfsd+0x10/0x10 kthread+0x1a2/0x1e0 ? kthread+0xf4/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x60 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> Kernel panic - not syncing: kernel: panic_on_warn set ... Clear acl_access/acl_default after posix_acl_release is called to prevent UAF from being triggered.
Impacted products
Vendor Product Version
Linux Linux Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
Version: a257cdd0e2179630d3201c32ba14d7fcb3c3a055
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   Linux Linux Version: 2.6.13
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Show details on NVD website


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              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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                "timestamp": "2025-02-27T17:57:11.080279Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: clear acl_access/acl_default after releasing them\n\nIf getting acl_default fails, acl_access and acl_default will be released\nsimultaneously. However, acl_access will still retain a pointer pointing\nto the released posix_acl, which will trigger a WARNING in\nnfs3svc_release_getacl like this:\n\n------------[ cut here ]------------\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 26 PID: 3199 at lib/refcount.c:28\nrefcount_warn_saturate+0xb5/0x170\nModules linked in:\nCPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted\n6.12.0-rc6-00079-g04ae226af01f-dirty #8\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04/01/2014\nRIP: 0010:refcount_warn_saturate+0xb5/0x170\nCode: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75\ne4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff \u003c0f\u003e 0b eb\ncd 0f b6 1d 8a3\nRSP: 0018:ffffc90008637cd8 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380\nRBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56\nR10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001\nR13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0\nFS:  0000000000000000(0000) GS:ffff88871ed00000(0000)\nknlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n ? refcount_warn_saturate+0xb5/0x170\n ? __warn+0xa5/0x140\n ? refcount_warn_saturate+0xb5/0x170\n ? report_bug+0x1b1/0x1e0\n ? handle_bug+0x53/0xa0\n ? exc_invalid_op+0x17/0x40\n ? asm_exc_invalid_op+0x1a/0x20\n ? tick_nohz_tick_stopped+0x1e/0x40\n ? refcount_warn_saturate+0xb5/0x170\n ? refcount_warn_saturate+0xb5/0x170\n nfs3svc_release_getacl+0xc9/0xe0\n svc_process_common+0x5db/0xb60\n ? __pfx_svc_process_common+0x10/0x10\n ? __rcu_read_unlock+0x69/0xa0\n ? __pfx_nfsd_dispatch+0x10/0x10\n ? svc_xprt_received+0xa1/0x120\n ? xdr_init_decode+0x11d/0x190\n svc_process+0x2a7/0x330\n svc_handle_xprt+0x69d/0x940\n svc_recv+0x180/0x2d0\n nfsd+0x168/0x200\n ? __pfx_nfsd+0x10/0x10\n kthread+0x1a2/0x1e0\n ? kthread+0xf4/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x60\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\nKernel panic - not syncing: kernel: panic_on_warn set ...\n\nClear acl_access/acl_default after posix_acl_release is called to prevent\nUAF from being triggered."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:21:24.933Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8a1737ae42c928384ab6447f6ee1a882510e85fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f7cfee1a316891890c505563aa54f3476db52fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e59b2b68782519560b3d6a41dd66a3d01a01cd3"
        },
        {
          "url": "https://git.kernel.org/stable/c/55d947315fb5f67a35e4e1d3e01bb886b9c6decf"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8d871523142f7895f250a856f8c4a4181614510"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fd94884174bd20beb1773990fd3b1aa877688d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/7faf14a7b0366f153284db0ad3347c457ea70136"
        }
      ],
      "title": "nfsd: clear acl_access/acl_default after releasing them",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21796",
    "datePublished": "2025-02-27T02:18:32.191Z",
    "dateReserved": "2024-12-29T08:45:45.768Z",
    "dateUpdated": "2025-05-04T07:21:24.933Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21796\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-27T03:15:20.497\",\"lastModified\":\"2025-03-21T15:42:34.703\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: clear acl_access/acl_default after releasing them\\n\\nIf getting acl_default fails, acl_access and acl_default will be released\\nsimultaneously. However, acl_access will still retain a pointer pointing\\nto the released posix_acl, which will trigger a WARNING in\\nnfs3svc_release_getacl like this:\\n\\n------------[ cut here ]------------\\nrefcount_t: underflow; use-after-free.\\nWARNING: CPU: 26 PID: 3199 at lib/refcount.c:28\\nrefcount_warn_saturate+0xb5/0x170\\nModules linked in:\\nCPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted\\n6.12.0-rc6-00079-g04ae226af01f-dirty #8\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n1.16.1-2.fc37 04/01/2014\\nRIP: 0010:refcount_warn_saturate+0xb5/0x170\\nCode: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75\\ne4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff \u003c0f\u003e 0b eb\\ncd 0f b6 1d 8a3\\nRSP: 0018:ffffc90008637cd8 EFLAGS: 00010282\\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde\\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380\\nRBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56\\nR10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001\\nR13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0\\nFS:  0000000000000000(0000) GS:ffff88871ed00000(0000)\\nknlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n ? refcount_warn_saturate+0xb5/0x170\\n ? __warn+0xa5/0x140\\n ? refcount_warn_saturate+0xb5/0x170\\n ? report_bug+0x1b1/0x1e0\\n ? handle_bug+0x53/0xa0\\n ? exc_invalid_op+0x17/0x40\\n ? asm_exc_invalid_op+0x1a/0x20\\n ? tick_nohz_tick_stopped+0x1e/0x40\\n ? refcount_warn_saturate+0xb5/0x170\\n ? refcount_warn_saturate+0xb5/0x170\\n nfs3svc_release_getacl+0xc9/0xe0\\n svc_process_common+0x5db/0xb60\\n ? __pfx_svc_process_common+0x10/0x10\\n ? __rcu_read_unlock+0x69/0xa0\\n ? __pfx_nfsd_dispatch+0x10/0x10\\n ? svc_xprt_received+0xa1/0x120\\n ? xdr_init_decode+0x11d/0x190\\n svc_process+0x2a7/0x330\\n svc_handle_xprt+0x69d/0x940\\n svc_recv+0x180/0x2d0\\n nfsd+0x168/0x200\\n ? __pfx_nfsd+0x10/0x10\\n kthread+0x1a2/0x1e0\\n ? kthread+0xf4/0x1e0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x34/0x60\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork_asm+0x1a/0x30\\n \u003c/TASK\u003e\\nKernel panic - not syncing: kernel: panic_on_warn set ...\\n\\nClear acl_access/acl_default after posix_acl_release is called to prevent\\nUAF from being triggered.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: borrar acl_access/acl_default despu\u00e9s de liberarlos Si la obtenci\u00f3n de acl_default falla, acl_access y acl_default se liberar\u00e1n simult\u00e1neamente. Sin embargo, acl_access a\u00fan conservar\u00e1 un puntero que apunta al posix_acl liberado, lo que activar\u00e1 una ADVERTENCIA en nfs3svc_release_getacl como esta: ------------[ cortar aqu\u00ed ]------------ refcount_t: desbordamiento insuficiente; use after free. ADVERTENCIA: CPU: 26 PID: 3199 at lib/refcount.c:28 refcount_warn_saturate+0xb5/0x170 Modules linked in: CPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted 6.12.0-rc6-00079-g04ae226af01f-dirty #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb5/0x170 Code: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75 e4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff \u0026lt;0f\u0026gt; 0b eb cd 0f b6 1d 8a3 RSP: 0018:ffffc90008637cd8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380 RBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56 R10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0 FS: 0000000000000000(0000) GS:ffff88871ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:  ? refcount_warn_saturate+0xb5/0x170 ? __warn+0xa5/0x140 ? refcount_warn_saturate+0xb5/0x170 ? report_bug+0x1b1/0x1e0 ? handle_bug+0x53/0xa0 ? exc_invalid_op+0x17/0x40 ? asm_exc_invalid_op+0x1a/0x20 ? tick_nohz_tick_stopped+0x1e/0x40 ? refcount_warn_saturate+0xb5/0x170 ? refcount_warn_saturate+0xb5/0x170 nfs3svc_release_getacl+0xc9/0xe0 svc_process_common+0x5db/0xb60 ? __pfx_svc_process_common+0x10/0x10 ? __rcu_read_unlock+0x69/0xa0 ? __pfx_nfsd_dispatch+0x10/0x10 ? svc_xprt_received+0xa1/0x120 ? xdr_init_decode+0x11d/0x190 svc_process+0x2a7/0x330 svc_handle_xprt+0x69d/0x940 svc_recv+0x180/0x2d0 nfsd+0x168/0x200 ? __pfx_nfsd+0x10/0x10 kthread+0x1a2/0x1e0 ? kthread+0xf4/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x60 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30  Kernel panic - not syncing: kernel: panic_on_warn set ...  Borre acl_access/acl_default despu\u00e9s de llamar a posix_acl_release para evitar que se active UAF.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.13\",\"versionEndExcluding\":\"5.10.235\",\"matchCriteriaId\":\"083BAD0B-AAB6-42E6-AC7B-963EBC5214F6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.179\",\"matchCriteriaId\":\"C708062C-4E1B-465F-AE6D-C09C46400875\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.129\",\"matchCriteriaId\":\"2DA5009C-C9B9-4A1D-9B96-78427E8F232C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.79\",\"matchCriteriaId\":\"B16AADE5-B2FD-4C14-B4E4-85E8EDAFE775\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.16\",\"matchCriteriaId\":\"13C8DB18-FC60-425F-84E5-3EDDEC61B2FC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.4\",\"matchCriteriaId\":\"2A2093ED-74A9-43F9-AC72-50030F374EA4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"186716B6-2B66-4BD0-852E-D48E71C0C85F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D3E781C-403A-498F-9DA9-ECEE50F41E75\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1fd94884174bd20beb1773990fd3b1aa877688d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2e59b2b68782519560b3d6a41dd66a3d01a01cd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55d947315fb5f67a35e4e1d3e01bb886b9c6decf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6f7cfee1a316891890c505563aa54f3476db52fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7faf14a7b0366f153284db0ad3347c457ea70136\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8a1737ae42c928384ab6447f6ee1a882510e85fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f8d871523142f7895f250a856f8c4a4181614510\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-21796\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-27T17:57:11.080279Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-27T17:57:12.507Z\"}}], \"cna\": {\"title\": \"nfsd: clear acl_access/acl_default after releasing them\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"8a1737ae42c928384ab6447f6ee1a882510e85fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"6f7cfee1a316891890c505563aa54f3476db52fd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"2e59b2b68782519560b3d6a41dd66a3d01a01cd3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"55d947315fb5f67a35e4e1d3e01bb886b9c6decf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"f8d871523142f7895f250a856f8c4a4181614510\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"1fd94884174bd20beb1773990fd3b1aa877688d9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\", \"lessThan\": \"7faf14a7b0366f153284db0ad3347c457ea70136\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/nfs2acl.c\", \"fs/nfsd/nfs3acl.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.13\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.13\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.235\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.179\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.129\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.79\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfs2acl.c\", \"fs/nfsd/nfs3acl.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8a1737ae42c928384ab6447f6ee1a882510e85fa\"}, {\"url\": \"https://git.kernel.org/stable/c/6f7cfee1a316891890c505563aa54f3476db52fd\"}, {\"url\": \"https://git.kernel.org/stable/c/2e59b2b68782519560b3d6a41dd66a3d01a01cd3\"}, {\"url\": \"https://git.kernel.org/stable/c/55d947315fb5f67a35e4e1d3e01bb886b9c6decf\"}, {\"url\": \"https://git.kernel.org/stable/c/f8d871523142f7895f250a856f8c4a4181614510\"}, {\"url\": \"https://git.kernel.org/stable/c/1fd94884174bd20beb1773990fd3b1aa877688d9\"}, {\"url\": \"https://git.kernel.org/stable/c/7faf14a7b0366f153284db0ad3347c457ea70136\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: clear acl_access/acl_default after releasing them\\n\\nIf getting acl_default fails, acl_access and acl_default will be released\\nsimultaneously. However, acl_access will still retain a pointer pointing\\nto the released posix_acl, which will trigger a WARNING in\\nnfs3svc_release_getacl like this:\\n\\n------------[ cut here ]------------\\nrefcount_t: underflow; use-after-free.\\nWARNING: CPU: 26 PID: 3199 at lib/refcount.c:28\\nrefcount_warn_saturate+0xb5/0x170\\nModules linked in:\\nCPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted\\n6.12.0-rc6-00079-g04ae226af01f-dirty #8\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n1.16.1-2.fc37 04/01/2014\\nRIP: 0010:refcount_warn_saturate+0xb5/0x170\\nCode: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75\\ne4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff \u003c0f\u003e 0b eb\\ncd 0f b6 1d 8a3\\nRSP: 0018:ffffc90008637cd8 EFLAGS: 00010282\\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde\\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380\\nRBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56\\nR10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001\\nR13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0\\nFS:  0000000000000000(0000) GS:ffff88871ed00000(0000)\\nknlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n ? refcount_warn_saturate+0xb5/0x170\\n ? __warn+0xa5/0x140\\n ? refcount_warn_saturate+0xb5/0x170\\n ? report_bug+0x1b1/0x1e0\\n ? handle_bug+0x53/0xa0\\n ? exc_invalid_op+0x17/0x40\\n ? asm_exc_invalid_op+0x1a/0x20\\n ? tick_nohz_tick_stopped+0x1e/0x40\\n ? refcount_warn_saturate+0xb5/0x170\\n ? refcount_warn_saturate+0xb5/0x170\\n nfs3svc_release_getacl+0xc9/0xe0\\n svc_process_common+0x5db/0xb60\\n ? __pfx_svc_process_common+0x10/0x10\\n ? __rcu_read_unlock+0x69/0xa0\\n ? __pfx_nfsd_dispatch+0x10/0x10\\n ? svc_xprt_received+0xa1/0x120\\n ? xdr_init_decode+0x11d/0x190\\n svc_process+0x2a7/0x330\\n svc_handle_xprt+0x69d/0x940\\n svc_recv+0x180/0x2d0\\n nfsd+0x168/0x200\\n ? __pfx_nfsd+0x10/0x10\\n kthread+0x1a2/0x1e0\\n ? kthread+0xf4/0x1e0\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork+0x34/0x60\\n ? __pfx_kthread+0x10/0x10\\n ret_from_fork_asm+0x1a/0x30\\n \u003c/TASK\u003e\\nKernel panic - not syncing: kernel: panic_on_warn set ...\\n\\nClear acl_access/acl_default after posix_acl_release is called to prevent\\nUAF from being triggered.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-03-24T15:40:32.454Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21796\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-24T15:40:32.454Z\", \"dateReserved\": \"2024-12-29T08:45:45.768Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-27T02:18:32.191Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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