CVE-2026-64058 (GCVE-0-2026-64058)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-09-14 11:58
VLAI
Title
netfs: Fix netfs_read_folio() to wait on writeback
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_folio() to wait on writeback Fix netfs_read_folio() to wait for an ongoing writeback to complete so that it can trust the dirty flag and whatever is attached to folio->private (folio->private may get cleaned up by the collector before it clears the writeback flag).
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < 090a8aa1894b72f5b3fc18dee68d42ad45f4a2c6 (git)
Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < f17b9121bb99f88188ec9be2db5da1d561f4c01b (git)
Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < b8271cccdd5e43cc8d738afb8b51f6ad05b1cb4b (git)
Affected: ee4cdf7ba857a894ad1650d6ab77669cbbfa329e , < ded0c6f1606061148c202825f7e53d711f9f84cf (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - The bug is in the netfs client page-cache path (`netfs_read_folio()`), reached only through local VFS operations (read/mmap/page fault) on mounted network filesystems (CIFS, Ceph, AFS, 9p, NFS+fscache), not from remote packet handling.\nAC:L - An attacker can reliably trigger the race by concurrently performing streaming writes and reads on the same folio from threads they control, forcing writeback while reads hit the vulnerable dirty-folio path.\nPR:L - Exploitation requires only unprivileged access to read/write files on an already-mounted netfs-backed filesystem; no CAP_SYS_ADMIN, real root, or user-namespace capability is needed.\nUI:N - No victim interaction is required beyond the attacker (or any local process with file access) issuing the concurrent read/write operations that trigger the race.\nS:U - The vulnerability corrupts kernel heap memory during local filesystem I/O in the same kernel security domain; it does not inherently cross VM, container, or IOMMU boundaries.\nC:H - The race frees `struct netfs_folio` in `folio-\u003eprivate` before writeback completes, creating a use-after-free that can expose or leak kernel heap contents when `netfs_read_gaps()` dereferences stale metadata.\nI:H - UAF on the kmalloc\u0027d `netfs_folio` object can be leveraged for heap manipulation; corrupted `dirty_offset`/`dirty_len` values drive subsequent I/O vector setup and pagecache writes in `netfs_read_gaps()`.\nA:H - Winning the race causes kernel oops/panic via NULL dereference or use-after-free during `netfs_read_gaps()`, and a malicious local user can repeat the trigger to deny availability on shared servers with CIFS/NFS/Ceph mounts."
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      "cve": "CVE-2026-64058",
      "id": "CVE-2026-64058",
      "initial_release_date": "2026-07-21T13:00:26Z",
      "product_status:known_affected": "29",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64058",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64058.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.