CVE-2025-37806
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: Keep write operations atomic
syzbot reported a NULL pointer dereference in __generic_file_write_iter. [1]
Before the write operation is completed, the user executes ioctl[2] to clear the compress flag of the file, which causes the is_compressed() judgment to return 0, further causing the program to enter the wrong process and call the wrong ops ntfs_aops_cmpr, which triggers the null pointer dereference of write_begin.
Use inode lock to synchronize ioctl and write to avoid this case.
[1] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000006 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=000000011896d000 [0000000000000000] pgd=0800000118b44403, p4d=0800000118b44403, pud=0800000117517403, pmd=0000000000000000 Internal error: Oops: 0000000086000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 6427 Comm: syz-executor347 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : generic_perform_write+0x29c/0x868 mm/filemap.c:4055 sp : ffff80009d4978a0 x29: ffff80009d4979c0 x28: dfff800000000000 x27: ffff80009d497bc8 x26: 0000000000000000 x25: ffff80009d497960 x24: ffff80008ba71c68 x23: 0000000000000000 x22: ffff0000c655dac0 x21: 0000000000001000 x20: 000000000000000c x19: 1ffff00013a92f2c x18: ffff0000e183aa1c x17: 0004060000000014 x16: ffff800083275834 x15: 0000000000000001 x14: 0000000000000000 x13: 0000000000000001 x12: ffff0000c655dac0 x11: 0000000000ff0100 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff80009d497980 x4 : ffff80009d497960 x3 : 0000000000001000 x2 : 0000000000000000 x1 : ffff0000e183a928 x0 : ffff0000d60b0fc0 Call trace: 0x0 (P) __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4156 ntfs_file_write_iter+0x54c/0x630 fs/ntfs3/file.c:1267 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x920/0xcf4 fs/read_write.c:679 ksys_write+0x15c/0x26c fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:739 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
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[2] ioctl$FS_IOC_SETFLAGS(r0, 0x40086602, &(0x7f00000000c0)=0x20)
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-476
Referencias
JSON original (NVD)
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{
"id": "CVE-2025-37806",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.5,
"attackVector": "LOCAL",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e",
"lessThan": "8db49e89a7f8b48ee59fa9ad32b6ed0879747df8",
"versionType": "git"
},
{
"status": "affected",
"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e",
"lessThan": "464139e18f619aa14fb921a61721862f43421c54",
"versionType": "git"
},
{
"status": "affected",
"version": "4534a70b7056fd4b9a1c6db5a4ce3c98546b291e",
"lessThan": "285cec318bf5a7a6c8ba999b2b6ec96f9a20590f",
"versionType": "git"
}
],
"programFiles": [
"fs/ntfs3/file.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.26",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.14.5",
"versionType": "semver",
"lessThanOrEqual": "6.14.*"
},
{
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ntfs3/file.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-05-08T07:15:51.773",
"references": [
{
"url": "https://git.kernel.org/stable/c/285cec318bf5a7a6c8ba999b2b6ec96f9a20590f",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/464139e18f619aa14fb921a61721862f43421c54",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8db49e89a7f8b48ee59fa9ad32b6ed0879747df8",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Analyzed",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Keep write operations atomic\n\nsyzbot reported a NULL pointer dereference in __generic_file_write_iter. [1]\n\nBefore the write operation is completed, the user executes ioctl[2] to clear\nthe compress flag of the file, which causes the is_compressed() judgment to\nreturn 0, further causing the program to enter the wrong process and call the\nwrong ops ntfs_aops_cmpr, which triggers the null pointer dereference of\nwrite_begin.\n\nUse inode lock to synchronize ioctl and write to avoid this case.\n\n[1]\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000000\nMem abort info:\n ESR = 0x0000000086000006\n EC = 0x21: IABT (current EL), IL = 32 bits\n SET = 0, FnV = 0\n EA = 0, S1PTW = 0\n FSC = 0x06: level 2 translation fault\nuser pgtable: 4k pages, 48-bit VAs, pgdp=000000011896d000\n[0000000000000000] pgd=0800000118b44403, p4d=0800000118b44403, pud=0800000117517403, pmd=0000000000000000\nInternal error: Oops: 0000000086000006 [#1] PREEMPT SMP\nModules linked in:\nCPU: 0 UID: 0 PID: 6427 Comm: syz-executor347 Not tainted 6.13.0-rc3-syzkaller-g573067a5a685 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\npstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : 0x0\nlr : generic_perform_write+0x29c/0x868 mm/filemap.c:4055\nsp : ffff80009d4978a0\nx29: ffff80009d4979c0 x28: dfff800000000000 x27: ffff80009d497bc8\nx26: 0000000000000000 x25: ffff80009d497960 x24: ffff80008ba71c68\nx23: 0000000000000000 x22: ffff0000c655dac0 x21: 0000000000001000\nx20: 000000000000000c x19: 1ffff00013a92f2c x18: ffff0000e183aa1c\nx17: 0004060000000014 x16: ffff800083275834 x15: 0000000000000001\nx14: 0000000000000000 x13: 0000000000000001 x12: ffff0000c655dac0\nx11: 0000000000ff0100 x10: 0000000000ff0100 x9 : 0000000000000000\nx8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000\nx5 : ffff80009d497980 x4 : ffff80009d497960 x3 : 0000000000001000\nx2 : 0000000000000000 x1 : ffff0000e183a928 x0 : ffff0000d60b0fc0\nCall trace:\n 0x0 (P)\n __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4156\n ntfs_file_write_iter+0x54c/0x630 fs/ntfs3/file.c:1267\n new_sync_write fs/read_write.c:586 [inline]\n vfs_write+0x920/0xcf4 fs/read_write.c:679\n ksys_write+0x15c/0x26c fs/read_write.c:731\n __do_sys_write fs/read_write.c:742 [inline]\n __se_sys_write fs/read_write.c:739 [inline]\n __arm64_sys_write+0x7c/0x90 fs/read_write.c:739\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744\n el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762\n\n[2]\nioctl$FS_IOC_SETFLAGS(r0, 0x40086602, &(0x7f00000000c0)=0x20)"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/ntfs3: Mantener las operaciones de escritura atómicas. syzbot reportó una desreferencia de puntero nulo en __generic_file_write_iter. [1] Antes de completar la operación de escritura, el usuario ejecuta ioctl[2] para borrar el indicador de compresión del archivo, lo que provoca que la sentencia is_compressed() devuelva 0, lo que provoca que el programa acceda al proceso incorrecto y llame a la operación incorrecta ntfs_aops_cmpr, lo que desencadena la desreferencia de puntero nulo de write_begin. Utilice el bloqueo de inodo para sincronizar ioctl y write y evitar este caso. [1] No se puede manejar la desreferencia del puntero NULL del núcleo en la dirección virtual 0000000000000000 Información de aborto de memoria: ESR = 0x0000000086000006 EC = 0x21: IABT (EL actual), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: error de traducción de nivel 2 usuario pgtable: 4k páginas, VAs de 48 bits, pgdp=000000011896d000 [000000000000000] pgd=0800000118b44403, p4d=0800000118b44403, pud=0800000117517403, pmd=0000000000000000 Error interno: Oops: 0000000086000006 [#1] PREEMPT Módulos SMP vinculados: CPU: 0 UID: 0 PID: 6427 Comm: syz-executor347 No contaminado 6.13.0-rc3-syzkaller-g573067a5a685 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 13/09/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : generic_perform_write+0x29c/0x868 mm/filemap.c:4055 sp : ffff80009d4978a0 x29: ffff80009d4979c0 x28: dfff800000000000 x27: ffff80009d497bc8 x26: 00000000000000000 x25: ffff80009d497960 x24: ffff80008ba71c68 x23: 0000000000000000 x22: ffff0000c655dac0 x21: 0000000000001000 x20: 0000000000000000c x19: 1ffff00013a92f2c x18: ffff0000e183aa1c x17: 0004060000000014 x16: ffff800083275834 x15: 0000000000000001 x14: 0000000000000000 x13: 0000000000000001 x12: ffff0000c655dac0 x11: 0000000000ff0100 x10: 0000000000ff0100 x9: 0000000000000000 x8: 0000000000000000 x7: 0000000000000000 x6: 0000000000000000 x5 : ffff80009d497980 x4 : ffff80009d497960 x3 : 0000000000001000 x2 : 0000000000000000 x1 : ffff0000e183a928 x0 : ffff0000d60b0fc0 Rastreo de llamada: 0x0 (P) __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4156 ntfs_file_write_iter+0x54c/0x630 fs/ntfs3/file.c:1267 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x920/0xcf4 fs/read_write.c:679 ksys_write+0x15c/0x26c fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:739 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 [2] ioctl$FS_IOC_SETFLAGS(r0, 0x40086602, &(0x7f00000000c0)=0x20) "
}
],
"lastModified": "2026-06-17T09:15:28.663",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "627E9A4C-99B3-4ED8-95D1-4E5FC0008064",
"versionEndExcluding": "6.12.26",
"versionStartIncluding": "5.15"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6B25CA7E-4CD0-46DB-B4EF-13A3516071FB",
"versionEndExcluding": "6.14.5",
"versionStartIncluding": "6.13"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}