CVE-2026-31596
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: handle invalid dinode in ocfs2_group_extend
[CAUSE] ocfs2_group_extend() assumes that the global bitmap inode block returned from ocfs2_inode_lock() has already been validated and BUG_ONs when the signature is not a dinode. That assumption is too strong for crafted filesystems because the JBD2-managed buffer path can bypass structural validation and return an invalid dinode to the resize ioctl.
[FIX] Validate the dinode explicitly in ocfs2_group_extend(). If the global bitmap buffer does not contain a valid dinode, report filesystem corruption with ocfs2_error() and fail the resize operation instead of crashing the kernel.
Detalles técnicos trazas, registros y código del informe original
[BUG] kernel BUG at fs/ocfs2/resize.c:308! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI RIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308 Code: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe Call Trace: ... ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583 x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e ...
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: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- Fecha de la puntuación: 5/10/2026
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
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1
- https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0
- https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f
- https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d
- https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b
- https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e
- https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1
- https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302
- https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-31596",
"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": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "7eafcf507fbd68f3276c00f6c02ef155ad69f79b",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "fabfa6b81bd386154d7e59f8cd8f760f9e68b48c",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "b328d8e7c437d0f026ba2c13788af6eae77700f1",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "6575f9fbf084502b7118a628425bf7866666498d",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "911b557dd7817460881fd51a03069b539c674d0e",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "e384a850a3370d89a7a446cdeccd964bfba2a302",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "10fb72c47aac446f12a4ccd962c7daa60cc890a1",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "41c6e9bc3a09539deab43957a3211d902a4818f0",
"versionType": "git"
},
{
"status": "affected",
"version": "10995aa2451afa20b721cc7de856cae1a13dba57",
"lessThan": "4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f",
"versionType": "git"
}
],
"programFiles": [
"fs/ocfs2/resize.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.29",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0.1",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ocfs2/resize.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-04-24T15:16:37.340",
"references": [
{
"url": "https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/4a1c0ddc6e7bcf2e9db0eeaab9340dcfe97f448f",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6575f9fbf084502b7118a628425bf7866666498d",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7eafcf507fbd68f3276c00f6c02ef155ad69f79b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b328d8e7c437d0f026ba2c13788af6eae77700f1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302",
"tags": [
"Patch"
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/fabfa6b81bd386154d7e59f8cd8f760f9e68b48c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: handle invalid dinode in ocfs2_group_extend\n\n[BUG]\nkernel BUG at fs/ocfs2/resize.c:308!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:ocfs2_group_extend+0x10aa/0x1ae0 fs/ocfs2/resize.c:308\nCode: 8b8520ff ffff83f8 860f8580 030000e8 5cc3c1fe\nCall Trace:\n ...\n ocfs2_ioctl+0x175/0x6e0 fs/ocfs2/ioctl.c:869\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n __se_sys_ioctl fs/ioctl.c:583 [inline]\n __x64_sys_ioctl+0x197/0x1e0 fs/ioctl.c:583\n x64_sys_call+0x1144/0x26a0 arch/x86/include/generated/asm/syscalls_64.h:17\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x93/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ...\n\n[CAUSE]\nocfs2_group_extend() assumes that the global bitmap inode block\nreturned from ocfs2_inode_lock() has already been validated and\nBUG_ONs when the signature is not a dinode. That assumption is too\nstrong for crafted filesystems because the JBD2-managed buffer path\ncan bypass structural validation and return an invalid dinode to the\nresize ioctl.\n\n[FIX]\nValidate the dinode explicitly in ocfs2_group_extend(). If the global\nbitmap buffer does not contain a valid dinode, report filesystem\ncorruption with ocfs2_error() and fail the resize operation instead of\ncrashing the kernel."
}
],
"lastModified": "2026-06-17T10:34:03.260",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "61A18ECC-DBBE-4804-B80E-C799CC05CD13",
"versionEndExcluding": "6.6.136",
"versionStartIncluding": "2.6.29"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8",
"versionEndExcluding": "6.12.83",
"versionStartIncluding": "6.7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555",
"versionEndExcluding": "6.18.24",
"versionStartIncluding": "6.13"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB",
"versionEndExcluding": "6.19.14",
"versionStartIncluding": "6.19"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A",
"versionEndExcluding": "7.0.1",
"versionStartIncluding": "7.0"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}