CVE-2026-80807 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226
https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44
https://git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796
https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8
https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1
https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648
https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71
https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1
https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152

Type	Values Removed	Values Added
Weaknesses		CWE-20

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject invalid block index in GC ioctl Syzbot reported list corruption caused by a double list_add_tail() call on bh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers(). Analysis revealed that the root cause was the insertion of a page/folio with a page index of ULONG_MAX into the page cache via the GC ioctl. filemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(), repeatedly detects a dirty folio with a page index of ULONG_MAX due to index wrap-around, leading to duplicate processing of dirty buffers. As a preparatory step, the GC ioctl loads the page/folio of the block to be moved during GC and inserts it into the page cache based on information in the nilfs_vdesc structure passed as an argument. Normally, this does not cause issues because the user-space GC library configures the nilfs_vdesc structure properly. However, since there is no range check on the parameters determining the page index, a request with artificially crafted parameters -- such as those generated by Syzbot -- can result in a page/folio being inserted with a page index of ULONG_MAX, triggering the above problem. This resolves the issue by checking the ranges of 'vd_offset' and 'vd_vblocknr' in the nilfs_vdesc structure that determine the page index, thereby preventing the invalid page/folio insertions.
Title		nilfs2: reject invalid block index in GC ioctl
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226 https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44 https://git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796 https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8 https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1 https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648 https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71 https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1 https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152

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Normally, this does\nnot cause issues because the user-space GC library configures the\nnilfs_vdesc structure properly. However, since there is no range check on\nthe parameters determining the page index, a request with artificially\ncrafted parameters -- such as those generated by Syzbot -- can result in a\npage/folio being inserted with a page index of ULONG_MAX, triggering the\nabove problem.\n\nThis resolves the issue by checking the ranges of 'vd_offset' and\n'vd_vblocknr' in the nilfs_vdesc structure that determine the page index,\nthereby preventing the invalid page/folio insertions."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nilfs2/ioctl.c"], "versions": [{"version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "lessThan": "898404cdf882d7b54f1132f75570984ca3214796", "status": "affected", "versionType": "git"}, {"version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "lessThan": "ba8a8b563a28d358c45c62a306d421434a058648", "status": "affected", "versionType": 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"7942b919f7321f95a777d396ff7894a7a83dc9b0", "lessThan": "a1735eae55448bc79c2da6593455791e886f6ed8", "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/nilfs2/ioctl.c"], "versions": [{"version": "2.6.30", "status": "affected"}, {"version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.108", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.47", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.11", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.1", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "2.6.30", "versionEndExcluding": "5.10.269"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.220"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.187"}, {"vulnerable": true, "criteria": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nilfs2/ioctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "898404cdf882d7b54f1132f75570984ca3214796", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "ba8a8b563a28d358c45c62a306d421434a058648", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "3bd064ccc70b85f9a3d53aece29dc8473be5a226", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "e447f7edb99bd00cec63d6f3049e2e5074946f71", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "fbcfb75c20d71a5b542ad4ac3b79d10b997c8152", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}, {"lessThan": "a1735eae55448bc79c2da6593455791e886f6ed8", "status": "affected", "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nilfs2/ioctl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.30"}, {"lessThan": "2.6.30", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.269", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.220", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.187", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.156", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.47", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.11", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject invalid block index in GC ioctl\n\nSyzbot reported list corruption caused by a double list_add_tail() call on\nbh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers().\n\nAnalysis revealed that the root cause was the insertion of a page/folio\nwith a page index of ULONG_MAX into the page cache via the GC ioctl.\nfilemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(),\nrepeatedly detects a dirty folio with a page index of ULONG_MAX due to\nindex wrap-around, leading to duplicate processing of dirty buffers.\n\nAs a preparatory step, the GC ioctl loads the page/folio of the block to\nbe moved during GC and inserts it into the page cache based on information\nin the nilfs_vdesc structure passed as an argument. Normally, this does\nnot cause issues because the user-space GC library configures the\nnilfs_vdesc structure properly. However, since there is no range check on\nthe parameters determining the page index, a request with artificially\ncrafted parameters -- such as those generated by Syzbot -- can result in a\npage/folio being inserted with a page index of ULONG_MAX, triggering the\nabove problem.\n\nThis resolves the issue by checking the ranges of 'vd_offset' and\n'vd_vblocknr' in the nilfs_vdesc structure that determine the page index,\nthereby preventing the invalid page/folio insertions."}], "id": "CVE-2026-80807", "lastModified": "2026-09-04T16:18:07.810", "metrics": {}, "published": "2026-09-04T16:18:07.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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