CVE-2026-45861 (GCVE-0-2026-45861)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-08-05 12:28
VLAI
Title
gfs2: Fix slab-use-after-free in qd_put
Summary
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix slab-use-after-free in qd_put Commit a475c5dd16e5 ("gfs2: Free quota data objects synchronously") started freeing quota data objects during filesystem shutdown instead of putting them back onto the LRU list, but it failed to remove these objects from the LRU list, causing LRU list corruption. This caused use-after-free when the shrinker (gfs2_qd_shrink_scan) tried to access already-freed objects on the LRU list. Fix this by removing qd objects from the LRU list before freeing them in qd_put(). Initial fix from Deepanshu Kartikey <kartikey406@gmail.com>.
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: a475c5dd16e57c570113eccba51955b5df8bb052 , < ca7c67bdd293089b3483f18886d6b2d0037d2ad9 (git)
Affected: a475c5dd16e57c570113eccba51955b5df8bb052 , < 1d47922b98046b8070a77347fb883a6523792803 (git)
Affected: a475c5dd16e57c570113eccba51955b5df8bb052 , < 80fff26d7a0c3926b511661c27eecc811a420eef (git)
Affected: a475c5dd16e57c570113eccba51955b5df8bb052 , < 22150a7d401d9e9169b9b68e05bed95f7f49bf69 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngfs2: Fix slab-use-after-free in qd_put\n\nCommit a475c5dd16e5 (\"gfs2: Free quota data objects synchronously\")\nstarted freeing quota data objects during filesystem shutdown instead of\nputting them back onto the LRU list, but it failed to remove these\nobjects from the LRU list, causing LRU list corruption.  This caused\nuse-after-free when the shrinker (gfs2_qd_shrink_scan) tried to access\nalready-freed objects on the LRU list.\n\nFix this by removing qd objects from the LRU list before freeing them in\nqd_put().\n\nInitial fix from Deepanshu Kartikey \u003ckartikey406@gmail.com\u003e."
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              "value": "AV:L - GFS2 is a local disk filesystem with no network-facing handler; the vulnerable qd lifecycle is reached only via local filesystem operations (mount, quota-incurring I/O, unmount/withdrawal, and the memory shrinker). No remote peer data path exists.\nAC:L - The bug leaves a freed object permanently linked on the global gfs2_qd_lru, so it is persistent rather than a tight race; the attacker can reliably drive the shrinker into the freed object by inducing memory pressure, with no condition outside the attacker\u0027s control.\nPR:L - Triggering requires local access to a GFS2 filesystem and the poisoned LRU is then dereferenced by an unprivileged memory-pressure-driven shrinker walk; consistent with clustered-filesystem UAF scoring (ocfs2 CVE-2026-31597/43075).\nUI:N - Once the LRU is corrupted, the use-after-free is reached through ordinary kernel memory reclaim without requiring any separate victim action.\nS:U - The corruption and its impact are confined to the kernel\u0027s own memory/security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The shrinker reads fields of the freed gfs2_quota_data object, and the freed slab can be reallocated with attacker-controlled data, enabling kernel memory disclosure typical of a use-after-free.\nI:H - gfs2_qd_isolate writes to the freed object (lockref_mark_dead and list_lru_isolate_move), giving a write primitive over freed/reallocated memory that can be leveraged for heap manipulation and control-flow corruption.\nA:H - The slab-use-after-free reliably corrupts the LRU list and freed memory, causing kernel oops/panic as observed by KASAN/syzbot."
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      "id": "CVE-2026-45861",
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      "title": "SUSE CVE CVE-2026-45861",
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}



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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

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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.