iomap: fix invalid folio access when i_blkbits differs from I/O granularity

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Summary

CVECVE-2026-31463
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:42 UTC
Updated2026-04-22 14:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iomap: fix invalid folio access when i_blkbits differs from I/O granularity Commit aa35dd5cbc06 ("iomap: fix invalid folio access after folio_end_read()") partially addressed invalid folio access for folios without an ifs attached, but it did not handle the case where 1 << inode->i_blkbits matches the folio size but is different from the granularity used for the IO, which means IO can be submitted for less than the full folio for the !ifs case. In this case, the condition: if (*bytes_submitted == folio_len) ctx->cur_folio = NULL; in iomap_read_folio_iter() will not invalidate ctx->cur_folio, and iomap_read_end() will still be called on the folio even though the IO helper owns it and will finish the read on it. Fix this by unconditionally invalidating ctx->cur_folio for the !ifs case.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b2f35ac4146d32d4424aaa941bbc681f12c1b9e6 4a927f670cdb0def226f9f85f42a9f19d9e09c88 git Not specified
CNA Linux Linux affected b2f35ac4146d32d4424aaa941bbc681f12c1b9e6 bd71fb3fea9945987053968f028a948997cba8cc git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4a927f670cdb0def226f9f85f42a9f19d9e09c88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd71fb3fea9945987053968f028a948997cba8cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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