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CVE-2022-50569 (GCVE-0-2022-50569)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-08-05 08:59
VLAI
Title
xfrm: Update ipcomp_scratches with NULL when freed
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: Update ipcomp_scratches with NULL when freed Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed
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: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < debca61df6bc2f65e020656c9c5b878d6b38d30f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a39f456d62810c0efb43cead22f98d95b53e4b1a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1e8abde895b3ac6a368cbdb372e8800c49e73a28 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 18373ed500f7cd53e24d9b0bd0f1c09d78dba87e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be81c44242b20fc3bdcc73480ef8aaee56f5d0b6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 03155680191ef0f004b1d6a5714c5b8cd271ab61 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f3bdba4440d82e0da2b1bfc35d3836c8a8e00677 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2c19945ce8095d065df550e7fe350cd5cc40c6e6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a04d2fc700f717104bfb95b0f6694e448a4537f (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.9.331 , ≤ 4.9.* (semver)
Unaffected: 4.14.296 , ≤ 4.14.* (semver)
Unaffected: 4.19.262 , ≤ 4.19.* (semver)
Unaffected: 5.4.220 , ≤ 5.4.* (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Update ipcomp_scratches with NULL when freed\n\nCurrently if ipcomp_alloc_scratches() fails to allocate memory\nipcomp_scratches holds obsolete address. So when we try to free the\npercpu scratches using ipcomp_free_scratches() it tries to vfree non\nexistent vm area. Described below:\n\nstatic void * __percpu *ipcomp_alloc_scratches(void)\n{\n        ...\n        scratches = alloc_percpu(void *);\n        if (!scratches)\n                return NULL;\nipcomp_scratches does not know about this allocation failure.\nTherefore holding the old obsolete address.\n        ...\n}\n\nSo when we free,\n\nstatic void ipcomp_free_scratches(void)\n{\n        ...\n        scratches = ipcomp_scratches;\nAssigning obsolete address from ipcomp_scratches\n\n        if (!scratches)\n                return;\n\n        for_each_possible_cpu(i)\n               vfree(*per_cpu_ptr(scratches, i));\nTrying to free non existent page, causing warning: trying to vfree\nexistent vm area.\n        ...\n}\n\nFix this breakage by updating ipcomp_scrtches with NULL when scratches\nis freed"
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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              "value": "AV:L - The bug is triggered only when creating/destroying IPComp XFRM states via local NETLINK_XFRM (xfrm_user_rcv_msg \u2192 xfrm_add_sa \u2192 ipcomp_init_state \u2192 ipcomp_alloc/free_scratches), not by processing remote packets on the IPComp input/output path.\nAC:L - The attacker fully controls the IPComp SA create/destroy cycle and can induce the required alloc_percpu failure via memory pressure before the next create, matching prior CNA scoring that treats attacker-induced allocation failure as Low complexity.\nPR:L - xfrm_user_rcv_msg requires CAP_NET_ADMIN via netlink_net_capable(sock_net()-\u003euser_ns), which an unprivileged user obtains with unshare -Urn; per guidance this is Low, not High.\nUI:N - The attacker opens a NETLINK_XFRM socket and sends XFRM_MSG_NEWSA/DELSA messages themselves; no separate victim action is required.\nS:U - The double-free/UAF corrupts host-kernel vmalloc/percpu state within the same OS security authority and does not cross a VM, IOMMU, or other boundary.\nC:H - After free without NULLing, the error path reads the freed percpu array to obtain scratch pointers and re-vfrees them; reclaim/spray of that memory yields a UAF read and arbitrary-vfree primitive, scored High per UAF guidance.\nI:H - Double-free of the percpu scratch pointer table and its vmalloc regions is classic heap corruption that enables arbitrary free and control-flow hijacking once the stale objects are reclaimed.\nA:H - The path produces the syzbot WARN in vfree/__vunmap and can oops/panic under panic_on_warn or corrupted free_percpu state; any UAF/double-free is High availability impact."
            }
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      "title": "xfrm: Update ipcomp_scratches with NULL when freed",
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    "datePublished": "2025-10-22T13:23:25.810Z",
    "dateReserved": "2025-10-22T13:20:23.760Z",
    "dateUpdated": "2026-08-05T08:59:09.466Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Update ipcomp_scratches with NULL when freed\n\nCurrently if ipcomp_alloc_scratches() fails to allocate memory\nipcomp_scratches holds obsolete address. So when we try to free the\npercpu scratches using ipcomp_free_scratches() it tries to vfree non\nexistent vm area. Described below:\n\nstatic void * __percpu *ipcomp_alloc_scratches(void)\n{\n        ...\n        scratches = alloc_percpu(void *);\n        if (!scratches)\n                return NULL;\nipcomp_scratches does not know about this allocation failure.\nTherefore holding the old obsolete address.\n        ...\n}\n\nSo when we free,\n\nstatic void ipcomp_free_scratches(void)\n{\n        ...\n        scratches = ipcomp_scratches;\nAssigning obsolete address from ipcomp_scratches\n\n        if (!scratches)\n                return;\n\n        for_each_possible_cpu(i)\n               vfree(*per_cpu_ptr(scratches, i));\nTrying to free non existent page, causing warning: trying to vfree\nexistent vm area.\n        ...\n}\n\nFix this breakage by updating ipcomp_scrtches with NULL when scratches\nis freed"
          }
        ],
        "id": "CVE-2022-50569",
        "lastModified": "2026-08-04T10:18:19.640",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2025-10-22T14:15:41.780",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/03155680191ef0f004b1d6a5714c5b8cd271ab61"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/18373ed500f7cd53e24d9b0bd0f1c09d78dba87e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1e8abde895b3ac6a368cbdb372e8800c49e73a28"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2c19945ce8095d065df550e7fe350cd5cc40c6e6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8a04d2fc700f717104bfb95b0f6694e448a4537f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a39f456d62810c0efb43cead22f98d95b53e4b1a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/be81c44242b20fc3bdcc73480ef8aaee56f5d0b6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/debca61df6bc2f65e020656c9c5b878d6b38d30f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f3bdba4440d82e0da2b1bfc35d3836c8a8e00677"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:37:41+00:00",
      "cve": "CVE-2022-50569",
      "id": "CVE-2022-50569",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "321",
      "product_status:known_affected": "66",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: Update ipcomp_scratches with NULL when freed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50569.json",
      "version": "3"
    }
  }
}



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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.