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CVE-2025-68212 (GCVE-0-2025-68212)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:57 – Updated: 2026-08-05 12:10
VLAI
Title
fs: Fix uninitialized 'offp' in statmount_string()
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: Fix uninitialized 'offp' in statmount_string() In statmount_string(), most flags assign an output offset pointer (offp) which is later updated with the string offset. However, the STATMOUNT_MNT_UIDMAP and STATMOUNT_MNT_GIDMAP cases directly set the struct fields instead of using offp. This leaves offp uninitialized, leading to a possible uninitialized dereference when *offp is updated. Fix it by assigning offp for UIDMAP and GIDMAP as well, keeping the code path consistent.
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: 37c4a9590e1efcae7749682239fc22a330d2d325 , < acfde9400e611c8d2668f1c70053c4a1d6ecfc36 (git)
Affected: 37c4a9590e1efcae7749682239fc22a330d2d325 , < 0778ac7df5137d5041783fadfc201f8fd55a1d9b (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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          "product": "Linux",
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            {
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              "value": "AV:L - The vulnerability is reached through the local statmount() syscall by requesting UID or GID mappings for an idmapped mount.\nAC:L - No race or uncontrollable condition is required; an attacker can reliably issue the request against a visible idmapped mount with a resolvable mapping.\nPR:L - No capability is required for a mount reachable beneath the caller\u0027s root, and an unprivileged user can access or create suitable idmapped mounts through user namespaces.\nUI:N - Exploitation requires only attacker-controlled syscalls and no action by another user.\nS:U - The corruption affects the host kernel within the same operating-system security authority, so ordinary privilege escalation does not change scope.\nC:H - The uninitialized write can partially corrupt seq.buf before it is used as a copy_to_user() source, creating a plausible kernel-memory disclosure primitive.\nI:H - The four-byte kernel write corrupts live pointers such as root.mnt or seq.buf, which are subsequently passed to mntput() or kvfree(), enabling further memory corruption and potential code execution.\nA:H - The malformed pointer is subsequently dereferenced or freed, producing a repeatable kernel oops and potentially a system-wide panic."
            }
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        "dateUpdated": "2026-08-05T12:10:14.921Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2025-12-16T13:57:08.327Z",
    "dateReserved": "2025-12-16T13:41:40.256Z",
    "dateUpdated": "2026-08-05T12:10:14.921Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Fix uninitialized \u0027offp\u0027 in statmount_string()\n\nIn statmount_string(), most flags assign an output offset pointer (offp)\nwhich is later updated with the string offset. However, the\nSTATMOUNT_MNT_UIDMAP and STATMOUNT_MNT_GIDMAP cases directly set the\nstruct fields instead of using offp. This leaves offp uninitialized,\nleading to a possible uninitialized dereference when *offp is updated.\n\nFix it by assigning offp for UIDMAP and GIDMAP as well, keeping the code\npath consistent."
          }
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        "lastModified": "2026-07-30T06:24:33.593",
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      "cve": "CVE-2025-68212",
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      "product_status:known_affected": "14",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs: Fix uninitialized \u0027offp\u0027 in statmount_string()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68212.json",
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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.
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  • 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.


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