nilfs2: reject invalid block index in GC ioctl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80807
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:07 UTC
Updated2026-09-04 16:18:07 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002010000 probability, percentile 0.099490000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 898404cdf882d7b54f1132f75570984ca3214796 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 ba8a8b563a28d358c45c62a306d421434a058648 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 3bd064ccc70b85f9a3d53aece29dc8473be5a226 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 e447f7edb99bd00cec63d6f3049e2e5074946f71 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 fbcfb75c20d71a5b542ad4ac3b79d10b997c8152 git Not specified
CNA Linux Linux affected 7942b919f7321f95a777d396ff7894a7a83dc9b0 a1735eae55448bc79c2da6593455791e886f6ed8 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 5.10.269 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.220 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.187 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.156 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.108 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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