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CVE-2026-72202ntfs: avoid heap allocation for free-cluster readahead state

Description

In the Linux kernel, the following vulnerability has been resolved: ntfs: avoid heap allocation for free-cluster readahead state get_nr_free_clusters() allocates a temporary file_ra_state before it publishes the precomputed free cluster count, sets NVolFreeClusterKnown(), and wakes vol->free_waitq. If that allocation fails, the worker returns without setting the flag or waking waiters, so callers waiting for the free count can block indefinitely. The readahead state is only used synchronously while scanning the bitmap. Keep it on the stack and pass it by address to the readahead helper. This eliminates the early allocation failure path instead of adding a special case that publishes a conservative count and wakes the waitqueue. Zero-initialize the on-stack state because file_ra_state_init() only sets ra_pages and prev_pos. Apply the same treatment to __get_nr_free_mft_records(), which scans the MFT bitmap with the same short-lived readahead state.

Timeline

  1. ID reserved

    By Linux

  2. · 6 days later

    Published

  3. · 3 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-72202, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Received3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.49% · top 57% of all CVEs (13 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • Linux · Linux

    • affected 6251f0b0de7d645e3591931ca4c11d8322c1866f – < 40ee64e633e5e413f2255bb48c063977d8c86f34
    • affected 6251f0b0de7d645e3591931ca4c11d8322c1866f – < c05132077df57a384919f61d7f8a8e76d748a6d4

  • Linux · Linux

    • affected 7.1
    • unaffected < 7.1
    • unaffected 7.1.5 – ≤ 7.1.*
    • unaffected 7.2 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .