xfrm: fix slab-use-after-free in decode_session6

{
  "id": "f5bcf3fe6d9cebabfd097771aab2e93f29848515ef6bd6677c372e9560b77e79",
  "url": "https://osv.dev/vulnerability/CVE-2023-53500",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfrm: fix slab-use-after-free in decode_session6",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfrm: fix slab-use-after-free in decode_session6 When the xfrm device is set to the qdisc of the sfb type, the cb field of the sent skb may be modified during enqueuing. Then, slab-use-after-free may occur when the xfrm device sends IPv6 packets. The stack information is as follows: BUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890 Read of size 1 at addr ffff8881111458ef by task swapper/3/0 CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.4.0-next-20230707 #409 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014 Call Trace: dump_stack_lvl+0xd9/0x150 print_address_description.constprop.0+0x2c/0x3c0 kasan_report+0x11d/0x130 decode_session6+0x103f/0x1890 __xfrm_decode_session+0x54/0xb0 xfrmi_xmit+0x173/0x1ca0 dev_hard_start_xmit+0x187/0x700 sch_direct_xmit+0x1a3/0xc30 __qdisc_run+0x510/0x17a0 __dev_queue_xmit+0x2215/0x3b10 neigh_connected_output+0x3c2/0x550 ip6_finish_output2+0x55a/0x1550 ip6_finish_output+0x6b9/0x1270 ip6_output+0x1f1/0x540 ndisc_send_skb+0xa63/0x1890 ndisc_send_rs+0x132/0x6f0 addrconf_rs_timer+0x3f1/0x870 call_timer_fn+0x1a0/0x580 expire_timers+0x29b/0x4b0 run_timer_softirq+0x326/0x910 __do_softirq+0x1d4/0x905 irq_exit_rcu+0xb7/0x120 sysvec_apic_timer_interrupt+0x97/0xc0 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:intel_idle_hlt+0x23/0x30 Code: 1f 84 00 00 00 00 00 f3 0f 1e fa 41 54 41 89 d4 0f 1f 44 00 00 66 90 0f 1f 44 00 00 0f 00 2d c4 9f a",
    "evidence": "osv:CVE-2023-53500",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.293",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.255",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.10.192",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.15.128",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-53500",
      "aliases": [
        "CVE-2023-53500"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H"
        }
      ],
      "affected": [
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                  "fixed": "db0e50741f0387f388e9ec824ea7ae8456554d5b"
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                  "fixed": "bafa236380816b41b2c4c6970d9067fefa4a6c9e"
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                {
                  "fixed": "44b3d40967009304617a7a6486490c1d6c12f899"
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                  "fixed": "0d27567fde5be5f0edc2db5c110142b7915b8fa8"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53500.json"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:49.178980395Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d27567fde5be5f0edc2db5c110142b7915b8fa8",
        "https://git.kernel.org/stable/c/44b3d40967009304617a7a6486490c1d6c12f899",
        "https://git.kernel.org/stable/c/53223f2ed1ef5c90dad814daaaefea4e68a933c8",
        "https://git.kernel.org/stable/c/86f15300a22656db3fa8c8967defbcd24fac4d37",
        "https://git.kernel.org/stable/c/bafa236380816b41b2c4c6970d9067fefa4a6c9e",
        "https://git.kernel.org/stable/c/da4cbaa75ed088b6d70db77b9103a27e2359e243",
        "https://git.kernel.org/stable/c/db0e50741f0387f388e9ec824ea7ae8456554d5b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53500.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53500",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53500.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53500",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517269,
  "published_at": "2025-10-01T11:45:51.182+00:00"
}