CVE-2025-21999 (GCVE-0-2025-21999)

Vulnerability from cvelistv5 – Published: 2025-04-03 07:19 – Updated: 2026-05-11 21:10
VLAI
Title
proc: fix UAF in proc_get_inode()
Summary
In the Linux kernel, the following vulnerability has been resolved: proc: fix UAF in proc_get_inode() Fix race between rmmod and /proc/XXX's inode instantiation. The bug is that pde->proc_ops don't belong to /proc, it belongs to a module, therefore dereferencing it after /proc entry has been registered is a bug unless use_pde/unuse_pde() pair has been used. use_pde/unuse_pde can be avoided (2 atomic ops!) because pde->proc_ops never changes so information necessary for inode instantiation can be saved _before_ proc_register() in PDE itself and used later, avoiding pde->proc_ops->... dereference. rmmod lookup sys_delete_module proc_lookup_de pde_get(de); proc_get_inode(dir->i_sb, de); mod->exit() proc_remove remove_proc_subtree proc_entry_rundown(de); free_module(mod); if (S_ISREG(inode->i_mode)) if (de->proc_ops->proc_read_iter) --> As module is already freed, will trigger UAF BUG: unable to handle page fault for address: fffffbfff80a702b PGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:proc_get_inode+0x302/0x6e0 RSP: 0018:ffff88811c837998 EFLAGS: 00010a06 RAX: dffffc0000000000 RBX: ffffffffc0538140 RCX: 0000000000000007 RDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158 RBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20 R10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0 R13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001 FS: 00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> proc_lookup_de+0x11f/0x2e0 __lookup_slow+0x188/0x350 walk_component+0x2ab/0x4f0 path_lookupat+0x120/0x660 filename_lookup+0x1ce/0x560 vfs_statx+0xac/0x150 __do_sys_newstat+0x96/0x110 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e [adobriyan@gmail.com: don't do 2 atomic ops on the common path]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < eda279586e571b05dff44d48e05f8977ad05855d (git)
Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < 4b0b8445b6fd41e6f62ac90547a0ea9d348de3fa (git)
Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < 966f331403dc3ed04ff64eaf3930cf1267965e53 (git)
Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < 63b53198aff2e4e6c5866a4ff73c7891f958ffa4 (git)
Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < ede3e8ac90ae106f0b29cd759aadebc1568f1308 (git)
Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < 64dc7c68e040251d9ec6e989acb69f8f6ae4a10b (git)
Affected: 97a32539b9568bb653683349e5a76d02ff3c3e2c , < 654b33ada4ab5e926cd9c570196fefa7bec7c1df (git)
Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.236 , ≤ 5.10.* (semver)
Unaffected: 5.15.180 , ≤ 5.15.* (semver)
Unaffected: 6.1.132 , ≤ 6.1.* (semver)
Unaffected: 6.6.85 , ≤ 6.6.* (semver)
Unaffected: 6.12.21 , ≤ 6.12.* (semver)
Unaffected: 6.13.9 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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              "confidentialityImpact": "HIGH",
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              "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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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nproc: fix UAF in proc_get_inode()\n\nFix race between rmmod and /proc/XXX\u0027s inode instantiation.\n\nThe bug is that pde-\u003eproc_ops don\u0027t belong to /proc, it belongs to a\nmodule, therefore dereferencing it after /proc entry has been registered\nis a bug unless use_pde/unuse_pde() pair has been used.\n\nuse_pde/unuse_pde can be avoided (2 atomic ops!) because pde-\u003eproc_ops\nnever changes so information necessary for inode instantiation can be\nsaved _before_ proc_register() in PDE itself and used later, avoiding\npde-\u003eproc_ops-\u003e...  dereference.\n\n      rmmod                         lookup\nsys_delete_module\n                         proc_lookup_de\n\t\t\t   pde_get(de);\n\t\t\t   proc_get_inode(dir-\u003ei_sb, de);\n  mod-\u003eexit()\n    proc_remove\n      remove_proc_subtree\n       proc_entry_rundown(de);\n  free_module(mod);\n\n                               if (S_ISREG(inode-\u003ei_mode))\n\t                         if (de-\u003eproc_ops-\u003eproc_read_iter)\n                           --\u003e As module is already freed, will trigger UAF\n\nBUG: unable to handle page fault for address: fffffbfff80a702b\nPGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nRIP: 0010:proc_get_inode+0x302/0x6e0\nRSP: 0018:ffff88811c837998 EFLAGS: 00010a06\nRAX: dffffc0000000000 RBX: ffffffffc0538140 RCX: 0000000000000007\nRDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158\nRBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20\nR10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0\nR13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001\nFS:  00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n proc_lookup_de+0x11f/0x2e0\n __lookup_slow+0x188/0x350\n walk_component+0x2ab/0x4f0\n path_lookupat+0x120/0x660\n filename_lookup+0x1ce/0x560\n vfs_statx+0xac/0x150\n __do_sys_newstat+0x96/0x110\n do_syscall_64+0x5f/0x170\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n[adobriyan@gmail.com: don\u0027t do 2 atomic ops on the common path]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:10:41.402Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/eda279586e571b05dff44d48e05f8977ad05855d"
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        {
          "url": "https://git.kernel.org/stable/c/4b0b8445b6fd41e6f62ac90547a0ea9d348de3fa"
        },
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          "url": "https://git.kernel.org/stable/c/966f331403dc3ed04ff64eaf3930cf1267965e53"
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          "url": "https://git.kernel.org/stable/c/63b53198aff2e4e6c5866a4ff73c7891f958ffa4"
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        {
          "url": "https://git.kernel.org/stable/c/654b33ada4ab5e926cd9c570196fefa7bec7c1df"
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      "title": "proc: fix UAF in proc_get_inode()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21999",
    "datePublished": "2025-04-03T07:19:03.040Z",
    "dateReserved": "2024-12-29T08:45:45.801Z",
    "dateUpdated": "2026-05-11T21:10:41.402Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-21999",
      "date": "2026-06-06",
      "epss": "0.00026",
      "percentile": "0.0783"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21999\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-03T08:15:15.360\",\"lastModified\":\"2025-11-03T20:17:36.150\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nproc: fix UAF in proc_get_inode()\\n\\nFix race between rmmod and /proc/XXX\u0027s inode instantiation.\\n\\nThe bug is that pde-\u003eproc_ops don\u0027t belong to /proc, it belongs to a\\nmodule, therefore dereferencing it after /proc entry has been registered\\nis a bug unless use_pde/unuse_pde() pair has been used.\\n\\nuse_pde/unuse_pde can be avoided (2 atomic ops!) because pde-\u003eproc_ops\\nnever changes so information necessary for inode instantiation can be\\nsaved _before_ proc_register() in PDE itself and used later, avoiding\\npde-\u003eproc_ops-\u003e...  dereference.\\n\\n      rmmod                         lookup\\nsys_delete_module\\n                         proc_lookup_de\\n\\t\\t\\t   pde_get(de);\\n\\t\\t\\t   proc_get_inode(dir-\u003ei_sb, de);\\n  mod-\u003eexit()\\n    proc_remove\\n      remove_proc_subtree\\n       proc_entry_rundown(de);\\n  free_module(mod);\\n\\n                               if (S_ISREG(inode-\u003ei_mode))\\n\\t                         if (de-\u003eproc_ops-\u003eproc_read_iter)\\n                           --\u003e As module is already freed, will trigger UAF\\n\\nBUG: unable to handle page fault for address: fffffbfff80a702b\\nPGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\\nCPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\nRIP: 0010:proc_get_inode+0x302/0x6e0\\nRSP: 0018:ffff88811c837998 EFLAGS: 00010a06\\nRAX: dffffc0000000000 RBX: ffffffffc0538140 RCX: 0000000000000007\\nRDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158\\nRBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20\\nR10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0\\nR13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001\\nFS:  00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n proc_lookup_de+0x11f/0x2e0\\n __lookup_slow+0x188/0x350\\n walk_component+0x2ab/0x4f0\\n path_lookupat+0x120/0x660\\n filename_lookup+0x1ce/0x560\\n vfs_statx+0xac/0x150\\n __do_sys_newstat+0x96/0x110\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n[adobriyan@gmail.com: don\u0027t do 2 atomic ops on the common path]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: proc: correcci\u00f3n de UAF en proc_get_inode(). Correcci\u00f3n de la competencia entre rmmod y la instanciaci\u00f3n de inodo de /proc/XXX. El error es que pde-\u0026gt;proc_ops no pertenece a /proc, sino a un m\u00f3dulo; por lo tanto, desreferenciarlo despu\u00e9s de registrar la entrada /proc es un error, a menos que se haya usado el par use_pde/unuse_pde(). Se puede evitar usar_pde/unuse_pde (\u00a12 operaciones at\u00f3micas!) porque pde-\u0026gt;proc_ops nunca cambia, de modo que la informaci\u00f3n necesaria para la instanciaci\u00f3n de inodo se puede guardar _antes_ de proc_register() en el propio PDE y usarse m\u00e1s tarde, evitando la desreferencia de pde-\u0026gt;proc_ops-\u0026gt;... . rmmod lookup sys_delete_module proc_lookup_de pde_get(de); proc_get_inode(dir-\u0026gt;i_sb, de); mod-\u0026gt;exit() proc_remove eliminar_sub\u00e1rbol_proc proc_entry_rundown(de); liberar_m\u00f3dulo(mod); if (S_ISREG(inode-\u0026gt;i_mode)) if (de-\u0026gt;proc_ops-\u0026gt;proc_read_iter) --\u0026gt; Como el m\u00f3dulo ya est\u00e1 liberado, se activar\u00e1 UAF ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: fffffbfff80a702b PGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:proc_get_inode+0x302/0x6e0 RSP: 0018:ffff88811c837998 EFLAGS: 00010a06 RAX: dffffc0000000000 RBX: fffffffc0538140 RCX: 0000000000000007 RDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158 RBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20 R10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0 R13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001 FS: 00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0 DR0: 00000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Rastreo de llamadas:  proc_lookup_de+0x11f/0x2e0 __lookup_slow+0x188/0x350 walk_component+0x2ab/0x4f0 path_lookupat+0x120/0x660 filename_lookup+0x1ce/0x560 vfs_statx+0xac/0x150 __do_sys_newstat+0x96/0x110 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e [adobriyan@gmail.com: no realice 2 operaciones at\u00f3micas en la ruta com\u00fan]\"}],\"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\":\"2.6.23\",\"versionEndExcluding\":\"6.1.132\",\"matchCriteriaId\":\"D37319E3-8D34-4CCC-9B92-A411C571A016\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.85\",\"matchCriteriaId\":\"BCB56F36-C998-496A-A2E4-D9E0BB3A5BFC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.21\",\"matchCriteriaId\":\"3B63C450-D73B-4A53-9861-98E25C16E842\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.9\",\"matchCriteriaId\":\"FAECBE4D-58CF-4836-BBAB-5E28B800A778\"},{\"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\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"66619FB8-0AAF-4166-B2CF-67B24143261D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"D3D6550E-6679-4560-902D-AF52DCFE905B\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4b0b8445b6fd41e6f62ac90547a0ea9d348de3fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/63b53198aff2e4e6c5866a4ff73c7891f958ffa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/64dc7c68e040251d9ec6e989acb69f8f6ae4a10b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/654b33ada4ab5e926cd9c570196fefa7bec7c1df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/966f331403dc3ed04ff64eaf3930cf1267965e53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/eda279586e571b05dff44d48e05f8977ad05855d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ede3e8ac90ae106f0b29cd759aadebc1568f1308\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "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-2025-21999\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-04-03T15:26:31.372538Z\"}}}], \"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\": \"2025-04-03T15:26:33.391Z\"}}], \"cna\": {\"title\": \"proc: fix UAF in proc_get_inode()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"eda279586e571b05dff44d48e05f8977ad05855d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"4b0b8445b6fd41e6f62ac90547a0ea9d348de3fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"966f331403dc3ed04ff64eaf3930cf1267965e53\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"63b53198aff2e4e6c5866a4ff73c7891f958ffa4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"ede3e8ac90ae106f0b29cd759aadebc1568f1308\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"64dc7c68e040251d9ec6e989acb69f8f6ae4a10b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"97a32539b9568bb653683349e5a76d02ff3c3e2c\", \"lessThan\": \"654b33ada4ab5e926cd9c570196fefa7bec7c1df\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/proc/generic.c\", \"fs/proc/inode.c\", \"fs/proc/internal.h\", \"include/linux/proc_fs.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.180\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.132\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/proc/generic.c\", \"fs/proc/inode.c\", \"fs/proc/internal.h\", \"include/linux/proc_fs.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/eda279586e571b05dff44d48e05f8977ad05855d\"}, {\"url\": \"https://git.kernel.org/stable/c/4b0b8445b6fd41e6f62ac90547a0ea9d348de3fa\"}, {\"url\": \"https://git.kernel.org/stable/c/966f331403dc3ed04ff64eaf3930cf1267965e53\"}, {\"url\": \"https://git.kernel.org/stable/c/63b53198aff2e4e6c5866a4ff73c7891f958ffa4\"}, {\"url\": \"https://git.kernel.org/stable/c/ede3e8ac90ae106f0b29cd759aadebc1568f1308\"}, {\"url\": \"https://git.kernel.org/stable/c/64dc7c68e040251d9ec6e989acb69f8f6ae4a10b\"}, {\"url\": \"https://git.kernel.org/stable/c/654b33ada4ab5e926cd9c570196fefa7bec7c1df\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nproc: fix UAF in proc_get_inode()\\n\\nFix race between rmmod and /proc/XXX\u0027s inode instantiation.\\n\\nThe bug is that pde-\u003eproc_ops don\u0027t belong to /proc, it belongs to a\\nmodule, therefore dereferencing it after /proc entry has been registered\\nis a bug unless use_pde/unuse_pde() pair has been used.\\n\\nuse_pde/unuse_pde can be avoided (2 atomic ops!) because pde-\u003eproc_ops\\nnever changes so information necessary for inode instantiation can be\\nsaved _before_ proc_register() in PDE itself and used later, avoiding\\npde-\u003eproc_ops-\u003e...  dereference.\\n\\n      rmmod                         lookup\\nsys_delete_module\\n                         proc_lookup_de\\n\\t\\t\\t   pde_get(de);\\n\\t\\t\\t   proc_get_inode(dir-\u003ei_sb, de);\\n  mod-\u003eexit()\\n    proc_remove\\n      remove_proc_subtree\\n       proc_entry_rundown(de);\\n  free_module(mod);\\n\\n                               if (S_ISREG(inode-\u003ei_mode))\\n\\t                         if (de-\u003eproc_ops-\u003eproc_read_iter)\\n                           --\u003e As module is already freed, will trigger UAF\\n\\nBUG: unable to handle page fault for address: fffffbfff80a702b\\nPGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\\nCPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\\nRIP: 0010:proc_get_inode+0x302/0x6e0\\nRSP: 0018:ffff88811c837998 EFLAGS: 00010a06\\nRAX: dffffc0000000000 RBX: ffffffffc0538140 RCX: 0000000000000007\\nRDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158\\nRBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20\\nR10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0\\nR13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001\\nFS:  00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cTASK\u003e\\n proc_lookup_de+0x11f/0x2e0\\n __lookup_slow+0x188/0x350\\n walk_component+0x2ab/0x4f0\\n path_lookupat+0x120/0x660\\n filename_lookup+0x1ce/0x560\\n vfs_statx+0xac/0x150\\n __do_sys_newstat+0x96/0x110\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n[adobriyan@gmail.com: don\u0027t do 2 atomic ops on the common path]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.132\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.85\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.21\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.9\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-06-19T12:56:46.985Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21999\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-19T12:56:46.985Z\", \"dateReserved\": \"2024-12-29T08:45:45.801Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-03T07:19:03.040Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.