CVE-2026-72197: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length
In the Linux kernel, the following vulnerability has been resolved:
fs/ntfs3: bound DeleteIndexEntryAllocation memmove length
In doaction()'s DeleteIndexEntryAllocation case, e->size comes from an on-disk INDEXBUFFER entry. When e->size makes e + e->size point past hdr + hdr->used, PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdifft that is silently cast to a quasi-infinite sizet when passed to memmove(). The memmove then walks past the destination buffer.
The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543 already carries the corresponding guard:
if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize || Add2Ptr(e, esize) > Add2Ptr(lrh, reclen) || used + esize > le32tocpu(hdr->total)) { goto dirtyvol; }
Apply the same shape to the allocation-path case. Also reject esize == 0: memmove(e, e, ...) is a no-op and leaves hdr->used unchanged, hiding a malformed entry from the existing checkindexheader() walk.
Reproduced under UML+KASAN on mainline 8d90b09e6741 by mounting a crafted NTFS image: the unguarded memmove takes a length of 0xffffffffffffff00 and the kernel oopses in memmove+0x81/0x1a0 on the doaction+0x36a2 frame.
[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-38.38.1 - Compensating control
In fs/ntfs3's do_action() DeleteIndexEntryAllocation case, reject malformed entries by going to dirty_vol when PtrOffset(e1, Add2Ptr(hdr, used)) < esize, Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len), used + esize > le32_to_cpu(hdr->total), or esize == 0; apply the same guard shape before the memmove.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72197?
The severity of CVE-2026-72197 is assessed to be 57.
What is CVE-2026-72197 about?
CVE-2026-72197 pertains to a vulnerability in the Linux kernel's fs/ntfs3 related to the DeleteIndexEntryAllocation function.
How do I fix CVE-2026-72197?
To fix CVE-2026-72197, update to the latest version of the Linux kernel where this vulnerability has been resolved.
What are the potential impacts of CVE-2026-72197?
CVE-2026-72197 may lead to memory corruption during the execution of certain file system operations.
Is CVE-2026-72197 specific to certain versions of the Linux kernel?
Yes, CVE-2026-72197 affects specific versions of the Linux kernel that utilize the fs/ntfs3 file system.