CVE-2026-98555 (GCVE-0-2026-98555)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:18 – Updated: 2026-10-24 14:09
VLAI
Title
llc: fix skb UAF and leaks on llc_mac_hdr_init() failure
Summary
In the Linux kernel, the following vulnerability has been resolved: llc: fix skb UAF and leaks on llc_mac_hdr_init() failure In llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init() fails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks the newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu), and double-frees skb when llc_conn_state_process() drops its reference. In llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is leaked if llc_mac_hdr_init() returns an error. Free nskb in all three error paths.
Severity
7.5 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fec0fe6838a7f45175667701fb51abb23a6ffb1e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b859ba18b5a1067f71db5618c6a4a70d55fa308b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8b855b645841b5a04e20339a22bb6d593c9b790d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d360b31f1a3666579422872aa7d1a751e20b76f9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 060f827aa3dc47939ee306da715cd6700d129616 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 41dcae82bece9f106b4dff0ee777bba8d157c8a8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cb3528ad8bb46fa6252f5d14ced7febddc18515d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 72f9dd522f8d6c5a00be9695c7bb74631eb5069e (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nllc: fix skb UAF and leaks on llc_mac_hdr_init() failure\n\nIn llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()\nfails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks\nthe newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu),\nand double-frees skb when llc_conn_state_process() drops its reference.\n\nIn llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is\nleaked if llc_mac_hdr_init() returns an error.\n\nFree nskb in all three error paths."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - An adjacent peer can send an IEEE 802.2 LLC2 I-format response with F=1 and N(S)=vR; llc_rcv() through llc_conn_handler() and llc_conn_state_process() reaches the patched action in AWAIT or AWAIT_REJ. LLC2 frames require the same VLAN or Layer-2 domain.\nAC:H - The peer can establish via SABME and withhold replies until the poll timer creates AWAIT, but the UAF also requires llc_mac_hdr_init() to fail. On the relevant VLAN path this requires skb_cow_head() to return -ENOMEM or an admin-driven device/headroom change, which the Layer-2 peer cannot reliably control.\nPR:N - llc_rcv() and llc_conn_handler() perform no peer authentication; a peer can send SABME and the triggering I response without local credentials. CAP_NET_RAW in llc_ui_create() constrains the host process creating the listener, not the remote peer.\nUI:N - Once the LLC listener exists, llc_conn_handler() creates and drives the incoming socket before userspace accept(), while the peer supplies the SABME, waits for the timer state, and sends the triggering I response. No further victim action is required.\nS:U - llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr() corrupts an skb owned by the host LLC stack, and all resulting effects remain within the same host-kernel security authority.\nC:H - The erroneous kfree_skb(skb) leaves pdu dangling, after which LLC_I_GET_NR(pdu) reads the freed object and llc_conn_state_process() continues using the same skb. Reuse of that slab object can expose attacker-influenced kernel memory.\nI:H - After the action frees the incoming skb, llc_conn_state_process() later calls kfree_skb(skb) again. Reallocation between these operations permits freed-object manipulation and allocator corruption capable of write or control-flow impact.\nA:H - The use-after-free culminates in a second kfree_skb() of the received frame in llc_conn_state_process(), which can cause a kernel oops, allocator failure, or panic."
            }
          ]
        }
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        "dateUpdated": "2026-10-24T14:09:24.593Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/72f9dd522f8d6c5a00be9695c7bb74631eb5069e"
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      "title": "llc: fix skb UAF and leaks on llc_mac_hdr_init() failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98555",
    "datePublished": "2026-10-18T15:18:22.631Z",
    "dateReserved": "2026-09-25T10:25:14.357Z",
    "dateUpdated": "2026-10-24T14:09:24.593Z",
    "state": "PUBLISHED"
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      "percentile": "0.2384"
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    "microsoft_vex": {
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      "id": "msrc_CVE-2026-98555",
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      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "llc: fix skb UAF and leaks on llc_mac_hdr_init() failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98555.json",
      "version": "3"
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      "cve": {
        "affected": [
          {
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              {
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                  "net/llc/llc_s_ac.c"
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nllc: fix skb UAF and leaks on llc_mac_hdr_init() failure\n\nIn llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init()\nfails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks\nthe newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu),\nand double-frees skb when llc_conn_state_process() drops its reference.\n\nIn llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is\nleaked if llc_mac_hdr_init() returns an error.\n\nFree nskb in all three error paths."
          }
        ],
        "id": "CVE-2026-98555",
        "lastModified": "2026-10-24T14:16:47.463",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.6,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-18T16:17:07.610",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/060f827aa3dc47939ee306da715cd6700d129616"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/41dcae82bece9f106b4dff0ee777bba8d157c8a8"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cb3528ad8bb46fa6252f5d14ced7febddc18515d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d360b31f1a3666579422872aa7d1a751e20b76f9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fec0fe6838a7f45175667701fb51abb23a6ffb1e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-24T14:23:45+00:00",
      "cve": "CVE-2026-98555",
      "id": "CVE-2026-98555",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: llc: fix skb UAF and leaks on llc_mac_hdr_init() failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98555.json",
      "version": "3"
    }
  }
}



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