CVE-2023-53500 (GCVE-0-2023-53500)
Vulnerability from cvelistv5
Published
2025-10-01 11:45
Modified
2025-10-01 11:45
Severity ?
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: <IRQ> 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 </IRQ> <TASK> 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 ab 00 0f 1f 44 00 00 fb f4 <fa> 44 89 e0 41 5c c3 66 0f 1f 44 00 00 f3 0f 1e fa 41 54 41 89 d4 RSP: 0018:ffffc90000197d78 EFLAGS: 00000246 RAX: 00000000000a83c3 RBX: ffffe8ffffd09c50 RCX: ffffffff8a22d8e5 RDX: 0000000000000001 RSI: ffffffff8d3f8080 RDI: ffffe8ffffd09c50 RBP: ffffffff8d3f8080 R08: 0000000000000001 R09: ffffed1026ba6d9d R10: ffff888135d36ceb R11: 0000000000000001 R12: 0000000000000001 R13: ffffffff8d3f8100 R14: 0000000000000001 R15: 0000000000000000 cpuidle_enter_state+0xd3/0x6f0 cpuidle_enter+0x4e/0xa0 do_idle+0x2fe/0x3c0 cpu_startup_entry+0x18/0x20 start_secondary+0x200/0x290 secondary_startup_64_no_verify+0x167/0x16b </TASK> Allocated by task 939: kasan_save_stack+0x22/0x40 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x7f/0x90 kmem_cache_alloc_node+0x1cd/0x410 kmalloc_reserve+0x165/0x270 __alloc_skb+0x129/0x330 inet6_ifa_notify+0x118/0x230 __ipv6_ifa_notify+0x177/0xbe0 addrconf_dad_completed+0x133/0xe00 addrconf_dad_work+0x764/0x1390 process_one_work+0xa32/0x16f0 worker_thread+0x67d/0x10c0 kthread+0x344/0x440 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff888111145800 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 239 bytes inside of freed 640-byte region [ffff888111145800, ffff888111145a80) As commit f855691975bb ("xfrm6: Fix the nexthdr offset in _decode_session6.") showed, xfrm_decode_session was originally intended only for the receive path. IP6CB(skb)->nhoff is not set during transmission. Therefore, set the cb field in the skb to 0 before sending packets.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d27567fde5be5f0edc2db5c110142b7915b8fa8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44b3d40967009304617a7a6486490c1d6c12f899
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53223f2ed1ef5c90dad814daaaefea4e68a933c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86f15300a22656db3fa8c8967defbcd24fac4d37
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bafa236380816b41b2c4c6970d9067fefa4a6c9e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da4cbaa75ed088b6d70db77b9103a27e2359e243
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db0e50741f0387f388e9ec824ea7ae8456554d5b
Impacted products
Vendor Product Version
Linux Linux Version: f855691975bb06373a98711e4cfe2c224244b536
Version: f855691975bb06373a98711e4cfe2c224244b536
Version: f855691975bb06373a98711e4cfe2c224244b536
Version: f855691975bb06373a98711e4cfe2c224244b536
Version: f855691975bb06373a98711e4cfe2c224244b536
Version: f855691975bb06373a98711e4cfe2c224244b536
Version: f855691975bb06373a98711e4cfe2c224244b536
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   Linux Linux Version: 3.19
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{
  "containers": {
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          "programFiles": [
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      "cpeApplicability": [
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix slab-use-after-free in decode_session6\n\nWhen the xfrm device is set to the qdisc of the sfb type, the cb field\nof the sent skb may be modified during enqueuing. Then,\nslab-use-after-free may occur when the xfrm device sends IPv6 packets.\n\nThe stack information is as follows:\nBUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890\nRead of size 1 at addr ffff8881111458ef by task swapper/3/0\nCPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.4.0-next-20230707 #409\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\nCall Trace:\n\u003cIRQ\u003e\ndump_stack_lvl+0xd9/0x150\nprint_address_description.constprop.0+0x2c/0x3c0\nkasan_report+0x11d/0x130\ndecode_session6+0x103f/0x1890\n__xfrm_decode_session+0x54/0xb0\nxfrmi_xmit+0x173/0x1ca0\ndev_hard_start_xmit+0x187/0x700\nsch_direct_xmit+0x1a3/0xc30\n__qdisc_run+0x510/0x17a0\n__dev_queue_xmit+0x2215/0x3b10\nneigh_connected_output+0x3c2/0x550\nip6_finish_output2+0x55a/0x1550\nip6_finish_output+0x6b9/0x1270\nip6_output+0x1f1/0x540\nndisc_send_skb+0xa63/0x1890\nndisc_send_rs+0x132/0x6f0\naddrconf_rs_timer+0x3f1/0x870\ncall_timer_fn+0x1a0/0x580\nexpire_timers+0x29b/0x4b0\nrun_timer_softirq+0x326/0x910\n__do_softirq+0x1d4/0x905\nirq_exit_rcu+0xb7/0x120\nsysvec_apic_timer_interrupt+0x97/0xc0\n\u003c/IRQ\u003e\n\u003cTASK\u003e\nasm_sysvec_apic_timer_interrupt+0x1a/0x20\nRIP: 0010:intel_idle_hlt+0x23/0x30\nCode: 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 ab 00 0f 1f 44 00 00 fb f4 \u003cfa\u003e 44 89 e0 41 5c c3 66 0f 1f 44 00 00 f3 0f 1e fa 41 54 41 89 d4\nRSP: 0018:ffffc90000197d78 EFLAGS: 00000246\nRAX: 00000000000a83c3 RBX: ffffe8ffffd09c50 RCX: ffffffff8a22d8e5\nRDX: 0000000000000001 RSI: ffffffff8d3f8080 RDI: ffffe8ffffd09c50\nRBP: ffffffff8d3f8080 R08: 0000000000000001 R09: ffffed1026ba6d9d\nR10: ffff888135d36ceb R11: 0000000000000001 R12: 0000000000000001\nR13: ffffffff8d3f8100 R14: 0000000000000001 R15: 0000000000000000\ncpuidle_enter_state+0xd3/0x6f0\ncpuidle_enter+0x4e/0xa0\ndo_idle+0x2fe/0x3c0\ncpu_startup_entry+0x18/0x20\nstart_secondary+0x200/0x290\nsecondary_startup_64_no_verify+0x167/0x16b\n\u003c/TASK\u003e\nAllocated by task 939:\nkasan_save_stack+0x22/0x40\nkasan_set_track+0x25/0x30\n__kasan_slab_alloc+0x7f/0x90\nkmem_cache_alloc_node+0x1cd/0x410\nkmalloc_reserve+0x165/0x270\n__alloc_skb+0x129/0x330\ninet6_ifa_notify+0x118/0x230\n__ipv6_ifa_notify+0x177/0xbe0\naddrconf_dad_completed+0x133/0xe00\naddrconf_dad_work+0x764/0x1390\nprocess_one_work+0xa32/0x16f0\nworker_thread+0x67d/0x10c0\nkthread+0x344/0x440\nret_from_fork+0x1f/0x30\nThe buggy address belongs to the object at ffff888111145800\nwhich belongs to the cache skbuff_small_head of size 640\nThe buggy address is located 239 bytes inside of\nfreed 640-byte region [ffff888111145800, ffff888111145a80)\n\nAs commit f855691975bb (\"xfrm6: Fix the nexthdr offset in\n_decode_session6.\") showed, xfrm_decode_session was originally intended\nonly for the receive path. IP6CB(skb)-\u003enhoff is not set during\ntransmission. Therefore, set the cb field in the skb to 0 before\nsending packets."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:45:51.182Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/da4cbaa75ed088b6d70db77b9103a27e2359e243"
        },
        {
          "url": "https://git.kernel.org/stable/c/db0e50741f0387f388e9ec824ea7ae8456554d5b"
        },
        {
          "url": "https://git.kernel.org/stable/c/bafa236380816b41b2c4c6970d9067fefa4a6c9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/44b3d40967009304617a7a6486490c1d6c12f899"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d27567fde5be5f0edc2db5c110142b7915b8fa8"
        },
        {
          "url": "https://git.kernel.org/stable/c/86f15300a22656db3fa8c8967defbcd24fac4d37"
        },
        {
          "url": "https://git.kernel.org/stable/c/53223f2ed1ef5c90dad814daaaefea4e68a933c8"
        }
      ],
      "title": "xfrm: fix slab-use-after-free in decode_session6",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53500",
    "datePublished": "2025-10-01T11:45:51.182Z",
    "dateReserved": "2025-10-01T11:39:39.404Z",
    "dateUpdated": "2025-10-01T11:45:51.182Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53500\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:53.490\",\"lastModified\":\"2025-10-02T19:11:46.753\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: fix slab-use-after-free in decode_session6\\n\\nWhen the xfrm device is set to the qdisc of the sfb type, the cb field\\nof the sent skb may be modified during enqueuing. Then,\\nslab-use-after-free may occur when the xfrm device sends IPv6 packets.\\n\\nThe stack information is as follows:\\nBUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890\\nRead of size 1 at addr ffff8881111458ef by task swapper/3/0\\nCPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.4.0-next-20230707 #409\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\\nCall Trace:\\n\u003cIRQ\u003e\\ndump_stack_lvl+0xd9/0x150\\nprint_address_description.constprop.0+0x2c/0x3c0\\nkasan_report+0x11d/0x130\\ndecode_session6+0x103f/0x1890\\n__xfrm_decode_session+0x54/0xb0\\nxfrmi_xmit+0x173/0x1ca0\\ndev_hard_start_xmit+0x187/0x700\\nsch_direct_xmit+0x1a3/0xc30\\n__qdisc_run+0x510/0x17a0\\n__dev_queue_xmit+0x2215/0x3b10\\nneigh_connected_output+0x3c2/0x550\\nip6_finish_output2+0x55a/0x1550\\nip6_finish_output+0x6b9/0x1270\\nip6_output+0x1f1/0x540\\nndisc_send_skb+0xa63/0x1890\\nndisc_send_rs+0x132/0x6f0\\naddrconf_rs_timer+0x3f1/0x870\\ncall_timer_fn+0x1a0/0x580\\nexpire_timers+0x29b/0x4b0\\nrun_timer_softirq+0x326/0x910\\n__do_softirq+0x1d4/0x905\\nirq_exit_rcu+0xb7/0x120\\nsysvec_apic_timer_interrupt+0x97/0xc0\\n\u003c/IRQ\u003e\\n\u003cTASK\u003e\\nasm_sysvec_apic_timer_interrupt+0x1a/0x20\\nRIP: 0010:intel_idle_hlt+0x23/0x30\\nCode: 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 ab 00 0f 1f 44 00 00 fb f4 \u003cfa\u003e 44 89 e0 41 5c c3 66 0f 1f 44 00 00 f3 0f 1e fa 41 54 41 89 d4\\nRSP: 0018:ffffc90000197d78 EFLAGS: 00000246\\nRAX: 00000000000a83c3 RBX: ffffe8ffffd09c50 RCX: ffffffff8a22d8e5\\nRDX: 0000000000000001 RSI: ffffffff8d3f8080 RDI: ffffe8ffffd09c50\\nRBP: ffffffff8d3f8080 R08: 0000000000000001 R09: ffffed1026ba6d9d\\nR10: ffff888135d36ceb R11: 0000000000000001 R12: 0000000000000001\\nR13: ffffffff8d3f8100 R14: 0000000000000001 R15: 0000000000000000\\ncpuidle_enter_state+0xd3/0x6f0\\ncpuidle_enter+0x4e/0xa0\\ndo_idle+0x2fe/0x3c0\\ncpu_startup_entry+0x18/0x20\\nstart_secondary+0x200/0x290\\nsecondary_startup_64_no_verify+0x167/0x16b\\n\u003c/TASK\u003e\\nAllocated by task 939:\\nkasan_save_stack+0x22/0x40\\nkasan_set_track+0x25/0x30\\n__kasan_slab_alloc+0x7f/0x90\\nkmem_cache_alloc_node+0x1cd/0x410\\nkmalloc_reserve+0x165/0x270\\n__alloc_skb+0x129/0x330\\ninet6_ifa_notify+0x118/0x230\\n__ipv6_ifa_notify+0x177/0xbe0\\naddrconf_dad_completed+0x133/0xe00\\naddrconf_dad_work+0x764/0x1390\\nprocess_one_work+0xa32/0x16f0\\nworker_thread+0x67d/0x10c0\\nkthread+0x344/0x440\\nret_from_fork+0x1f/0x30\\nThe buggy address belongs to the object at ffff888111145800\\nwhich belongs to the cache skbuff_small_head of size 640\\nThe buggy address is located 239 bytes inside of\\nfreed 640-byte region [ffff888111145800, ffff888111145a80)\\n\\nAs commit f855691975bb (\\\"xfrm6: Fix the nexthdr offset in\\n_decode_session6.\\\") showed, xfrm_decode_session was originally intended\\nonly for the receive path. IP6CB(skb)-\u003enhoff is not set during\\ntransmission. Therefore, set the cb field in the skb to 0 before\\nsending packets.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0d27567fde5be5f0edc2db5c110142b7915b8fa8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44b3d40967009304617a7a6486490c1d6c12f899\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53223f2ed1ef5c90dad814daaaefea4e68a933c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86f15300a22656db3fa8c8967defbcd24fac4d37\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bafa236380816b41b2c4c6970d9067fefa4a6c9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/da4cbaa75ed088b6d70db77b9103a27e2359e243\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db0e50741f0387f388e9ec824ea7ae8456554d5b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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