VULN/vuln-cve
1
0 Fork 0
Code Pull Requests Actions Activity
Files
c1444140e59c61ba154436ea0cd6284d8a97c3f0
vuln-cve/data/2026/31xxx/CVE-2026-31597.json
T

287 lines
15 KiB
JSON
Raw Blame History

{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-31597",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-03-09T15:48:24.121Z",
"datePublished": "2026-04-24T14:42:22.655Z",
"dateUpdated": "2026-08-05T12:23:41.347Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:23:41.347Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY\n\nfilemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY,\nas documented in mm/filemap.c:\n\n \"If our return value has VM_FAULT_RETRY set, it's because the mmap_lock\n may be dropped before doing I/O or by lock_folio_maybe_drop_mmap().\"\n\nWhen this happens, a concurrent munmap() can call remove_vma() and free\nthe vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then\nbecomes a dangling pointer, and the subsequent trace_ocfs2_fault() call\ndereferences it -- a use-after-free.\n\nFix this by saving ip_blkno as a plain integer before calling\nfilemap_fault(), and removing vma from the trace event. Since\nip_blkno is copied by value before the lock can be dropped, it\nremains valid regardless of what happens to the vma or inode\nafterward."
}
],
"metrics": [
{
"cvssV3_1": {
"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable path is reached by local user memory-management operations on an OCFS2 regular file mapping, via mmap/page fault and concurrent unmap. It is not directly reachable from network packets or adjacent/physical interfaces.\nAC:L - The attacker can control the relevant mmap, page fault, and munmap activity from their own process or cooperating threads. The VM_FAULT_RETRY window is a normal retry path where filemap_fault() may drop mmap_lock, so the race is attacker-repeatable.\nPR:L - A basic local user with permission to open and mmap a file on an already-mounted OCFS2 filesystem can reach ocfs2_fault(); no kernel capability is needed for the fault/unmap path. Mounting OCFS2 itself is privileged, but a reasonable OCFS2 deployment already has the filesystem mounted.\nUI:N - Exploitation does not require a separate victim action after the attacker has local access. The attacker triggers the mmap, page fault, and munmap operations directly.\nS:U - The vulnerability is in kernel filesystem/MM handling and impacts the same kernel security authority. This is standard local kernel compromise/DoS territory, not a cross-scope VM or sandbox boundary by itself.\nC:H - This is a kernel heap use-after-free of a vm_area_struct after mmap_lock can be dropped and the VMA freed. Under the stated kernel guidance, use-after-free bugs are scored High for confidentiality because freed object reuse can enable kernel memory disclosure.\nI:H - Although the observed KASAN report is a UAF read, it is still a dangling kernel heap object use in attacker-influenced VMA lifetime/reuse conditions. Under the stated guidance and uncertainty rule, UAF memory corruption is scored High for integrity.\nA:H - The bug has a demonstrated KASAN slab-use-after-free in ocfs2_fault() and can crash/oops the kernel. Kernel crash availability impact is High."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/mmap.c",
"fs/ocfs2/ocfs2_trace.h"
],
"versions": [
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "36539c4d536f851a3b346a6ebb27b51bc3d77a94",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "35c2c05261d6f6d84aaa1355afa201d507943e76",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "3f5e74b5db9353b01ed50f4de84e75b755f8fbc2",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "6f072daefcab1d84ce37c073645615f63be91006",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "4cf2768a0291a0cdd0dae801ea0eafa3878a349d",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "d45ff441b416d4aa1af72b1db23d959601c04da2",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "76a602fdbb78dd05b2da06f74a988cebc97e82d0",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "925bf22c1b823e231b1baea761fe8a1512e442f2",
"status": "affected",
"versionType": "git"
},
{
"version": "614a9e849ca6ea24843795251cb30af525d5336b",
"lessThan": "7de554cabf160e331e4442e2a9ad874ca9875921",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ocfs2/mmap.c",
"fs/ocfs2/ocfs2_trace.h"
],
"versions": [
{
"version": "2.6.39",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.39",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.258",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.209",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.175",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.136",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.83",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.24",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19.14",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0.1",
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "5.10.258"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "5.15.209"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "6.1.175"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "6.6.136"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "6.12.83"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "6.18.24"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "6.19.14"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "7.0.1"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.39",
"versionEndExcluding": "7.1"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/36539c4d536f851a3b346a6ebb27b51bc3d77a94"
},
{
"url": "https://git.kernel.org/stable/c/35c2c05261d6f6d84aaa1355afa201d507943e76"
},
{
"url": "https://git.kernel.org/stable/c/3f5e74b5db9353b01ed50f4de84e75b755f8fbc2"
},
{
"url": "https://git.kernel.org/stable/c/6f072daefcab1d84ce37c073645615f63be91006"
},
{
"url": "https://git.kernel.org/stable/c/4cf2768a0291a0cdd0dae801ea0eafa3878a349d"
},
{
"url": "https://git.kernel.org/stable/c/d45ff441b416d4aa1af72b1db23d959601c04da2"
},
{
"url": "https://git.kernel.org/stable/c/76a602fdbb78dd05b2da06f74a988cebc97e82d0"
},
{
"url": "https://git.kernel.org/stable/c/925bf22c1b823e231b1baea761fe8a1512e442f2"
},
{
"url": "https://git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921"
}
],
"title": "ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
View Git Blame Copy Permalink