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CVE-2023-54050 (GCVE-0-2023-54050)

Vulnerability from cvelistv5 – Published: 2025-12-24 12:23 – Updated: 2026-08-05 09:16
VLAI
Title
ubifs: Fix memleak when insert_old_idx() failed
Summary
In the Linux kernel, the following vulnerability has been resolved: ubifs: Fix memleak when insert_old_idx() failed Following process will cause a memleak for copied up znode: dirty_cow_znode zn = copy_znode(c, znode); err = insert_old_idx(c, zbr->lnum, zbr->offs); if (unlikely(err)) return ERR_PTR(err); // No one refers to zn. Fetch a reproducer in [Link]. Function copy_znode() is split into 2 parts: resource allocation and znode replacement, insert_old_idx() is split in similar way, so resource cleanup could be done in error handling path without corrupting metadata(mem & disk). It's okay that old index inserting is put behind of add_idx_dirt(), old index is used in layout_leb_in_gaps(), so the two processes do not depend on each other.
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: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < cc29c7216d7f057eb0613b97dc38c7e1962a88d2 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 6f2eee5457bc48b0426dedfd78cdbdea241a6edb (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 66e9f2fb3e753f820bec2a98e8c6387029988320 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 3ae75f82c33fa1b4ca2006b55c84f4ef4a428d4d (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < ef9aac603659e9ffe7d69ae16e3f0fc0991a965b (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < 79079cebbeed624b9d01cfcf1e3254ae1a1f6e14 (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < a6da0ab9847779e05a7416c7a98148b549de69ef (git)
Affected: 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d , < b5fda08ef213352ac2df7447611eb4d383cce929 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 4.19.283 , ≤ 4.19.* (semver)
Unaffected: 5.4.243 , ≤ 5.4.* (semver)
Unaffected: 5.10.180 , ≤ 5.10.* (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubifs: Fix memleak when insert_old_idx() failed\n\nFollowing process will cause a memleak for copied up znode:\n\ndirty_cow_znode\n  zn = copy_znode(c, znode);\n  err = insert_old_idx(c, zbr-\u003elnum, zbr-\u003eoffs);\n  if (unlikely(err))\n     return ERR_PTR(err);   // No one refers to zn.\n\nFetch a reproducer in [Link].\n\nFunction copy_znode() is split into 2 parts: resource allocation\nand znode replacement, insert_old_idx() is split in similar way,\nso resource cleanup could be done in error handling path without\ncorrupting metadata(mem \u0026 disk).\nIt\u0027s okay that old index inserting is put behind of add_idx_dirt(),\nold index is used in layout_leb_in_gaps(), so the two processes do\nnot depend on each other."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The vulnerable path is reached only through local filesystem syscalls (write/create/unlink/rename/truncate) on a mounted UBIFS volume via ubifs_jnl_* \u2192 ubifs_tnc_add/remove \u2192 lookup_level0_dirty \u2192 dirty_cow_znode. No network protocol handler parses remote data into this code.\nAC:L - Both preconditions are attacker-driven: the COW branch is entered by forcing a commit with fsync/sync while doing metadata work, and the GFP_NOFS allocation failure is produced by deliberately induced memory pressure, which is readily achievable by an unprivileged process on the memory-constrained embedded systems where UBIFS is deployed and which simultaneously activates the shrinker path that turns the corruption into a UAF.\nPR:L - Only an unprivileged local user with write access to any directory on the UBIFS mount is needed; there is no capability, namespace, or admin check anywhere between the syscall entry and dirty_cow_znode.\nUI:N - The attacker triggers everything with their own file operations on an already-mounted filesystem; no victim action, no mount by another user, and no special file is required.\nS:U - The corruption is confined to the kernel\u0027s own TNC structures and the mounted filesystem; there is no crossing into another security authority such as a hypervisor or IOMMU domain.\nC:H - The dangling zbranch[].znode left after shrink_tnc() frees a child through the orphaned parent yields a use-after-free read of a generic kmalloc slab object, letting the attacker read reclaimed kernel memory through TNC descent and, with a sprayed replacement znode, escalate to arbitrary kernel reads.\nI:H - The same use-after-free gives write access to the freed/reallocated znode (flag setting, key_copy, parent re-pointing), a classic control-flow-hijack primitive, and the truncated commit list plus mis-set cparent additionally corrupt the on-disk index \u2014 the commit message itself cites \"corrupting metadata(mem \u0026 disk)\".\nA:H - Beyond the znode memory leak, the orphaned root case NULL-derefs in ubifs_tnc_levelorder_next() and runs off the end of ubifs_destroy_tnc_subtree() (oops at shrink or unmount), and the dirty_zn_cnt/parent assertions in get_znodes_to_commit() force the filesystem read-only or BUG() depending on assert_action."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "ubifs: Fix memleak when insert_old_idx() failed",
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    "datePublished": "2025-12-24T12:23:00.366Z",
    "dateReserved": "2025-12-24T12:21:05.090Z",
    "dateUpdated": "2026-08-05T09:16:47.787Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:52:37+00:00",
      "cve": "CVE-2023-54050",
      "id": "CVE-2023-54050",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ubifs: Fix memleak when insert_old_idx() failed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54050.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:04:15Z",
      "cve": "CVE-2023-54050",
      "id": "CVE-2023-54050",
      "initial_release_date": "2025-12-25T00:56:49Z",
      "product_status:known_affected": "475",
      "product_status:known_not_affected": "258",
      "product_status:recommended": "196",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54050",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54050.json",
      "version": "21"
    }
  }
}



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Taxonomy of the tags.





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.