CVE-2026-64159
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix zeropoint update where i_size > remote_i_size Fix the update of the zero point[*] by netfs_release_folio() when there is uncommitted data in the pagecache beyond the folio being released but the on-server EOF is in this folio (ie. i_size > remote_i_size). The update needs to limit zero_point to remote_i_size, not i_size as i_size is a local phenomenon reflecting updates made locally to the pagecache, not stuff written to the server. remote_i_size tracks the server's i_size. [*] The zero point is the file position from which we can assume that the server will just return zeros, so we can avoid generating reads. Note that netfs_invalidate_folio() probably doesn't need fixing as zero_point should be updated by setattr after truncation or fallocate. Found with: fsx -q -N 1000000 -p 10000 -o 128000 -l 600000 \ /xfstest.test/junk --replay-ops=junk.fsxops using the following as junk.fsxops: truncate 0x0 0x1bbae 0x82864 write 0x3ef2e 0xf9c8 0x1bbae write 0x67e05 0xcb5a 0x4e8f6 mapread 0x57781 0x85b6 0x7495f copy_range 0x5d3d 0x10329 0x54fac 0x7495f write 0x64710 0x1c2b 0x7495f mapread 0x64000 0x1000 0x7495f on cifs with the default cache option. It shows read-gaps on folio 0x64 failing with a short read (ie. it hits EOF) if the FMODE_READ check is commented out in netfs_perform_write(): if (//(file->f_mode & FMODE_READ) || netfs_is_cache_enabled(ctx)) { and no fscache. This was initially found with the generic/522 xfstest.
View original CVE JSON
{
"id": "CVE-2026-64159",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-19T16:17:57.913",
"lastModified": "2026-10-21T13:19:21.530",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix zeropoint update where i_size > remote_i_size\n\nFix the update of the zero point[*] by netfs_release_folio() when there is\nuncommitted data in the pagecache beyond the folio being released but the\non-server EOF is in this folio (ie. i_size > remote_i_size). The update\nneeds to limit zero_point to remote_i_size, not i_size as i_size is a local\nphenomenon reflecting updates made locally to the pagecache, not stuff\nwritten to the server. remote_i_size tracks the server's i_size.\n\n[*] The zero point is the file position from which we can assume that the\n server will just return zeros, so we can avoid generating reads.\n\nNote that netfs_invalidate_folio() probably doesn't need fixing as\nzero_point should be updated by setattr after truncation or fallocate.\n\nFound with:\n\n fsx -q -N 1000000 -p 10000 -o 128000 -l 600000 \\\n /xfstest.test/junk --replay-ops=junk.fsxops\n\nusing the following as junk.fsxops:\n\n truncate 0x0 0x1bbae 0x82864\n write 0x3ef2e 0xf9c8 0x1bbae\n write 0x67e05 0xcb5a 0x4e8f6\n mapread 0x57781 0x85b6 0x7495f\n copy_range 0x5d3d 0x10329 0x54fac 0x7495f\n write 0x64710 0x1c2b 0x7495f\n mapread 0x64000 0x1000 0x7495f\n\non cifs with the default cache option.\n\nIt shows read-gaps on folio 0x64 failing with a short read (ie. it hits\nEOF) if the FMODE_READ check is commented out in netfs_perform_write():\n\n if (//(file->f_mode & FMODE_READ) ||\n netfs_is_cache_enabled(ctx)) {\n\nand no fscache. This was initially found with the generic/522 xfstest."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"fs/netfs/misc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "f706e3889ff75877ecb3abae5ad667dbc990331e",
"versionType": "git",
"status": "affected"
},
{
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "5afc2d9b86bed2e4d9e1ba467790cbc793223f98",
"versionType": "git",
"status": "affected"
},
{
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "5cd5207de519ef0c085f4f559adf5eefcb4c5202",
"versionType": "git",
"status": "affected"
},
{
"version": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092",
"lessThan": "4543a4d737944134a1394afe797622546fbcc98a",
"versionType": "git",
"status": "affected"
},
{
"version": "e2814004138a541110d4b2dc254a8f619c2c4ce0",
"versionType": "git",
"status": "affected"
},
{
"version": "6.10.8",
"lessThan": "6.11",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"fs/netfs/misc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.11",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.114",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.57",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.0.11",
"lessThanOrEqual": "7.0.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.10.8",
"versionEndExcluding": "6.11",
"matchCriteriaId": "A02E8785-F168-404D-9180-1DBF7349FF28"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.11.1",
"versionEndExcluding": "7.0.11",
"matchCriteriaId": "0F462A69-5D23-4583-879D-334BAD44AFC2"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:-:*:*:*:*:*:*",
"matchCriteriaId": "4770BA57-3F3F-493B-8608-EC3B25254949"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*",
"matchCriteriaId": "B77A9280-37E6-49AD-B559-5B23A3B1DC3D"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:*",
"matchCriteriaId": "DE5298B3-04B4-4F3E-B186-01A58B5C75A6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
"matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
"matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
"matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*",
"matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/4543a4d737944134a1394afe797622546fbcc98a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/5afc2d9b86bed2e4d9e1ba467790cbc793223f98",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5cd5207de519ef0c085f4f559adf5eefcb4c5202",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
]
},
{
"url": "https://git.kernel.org/stable/c/f706e3889ff75877ecb3abae5ad667dbc990331e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}