{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-39301",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-39301"
  ],
  "published": "2024-06-25T14:22:58Z",
  "summary": "net/9p: fix uninit-value in p9_client_rpc()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix uninit-value in p9_client_rpc()\n\nSyzbot with the help of KMSAN reported the following error:\n\nBUG: KMSAN: uninit-value in trace_9p_client_res include/trace/events/9p.h:146 [inline]\nBUG: KMSAN: uninit-value in p9_client_rpc+0x1314/0x1340 net/9p/client.c:754\n trace_9p_client_res include/trace/events/9p.h:146 [inline]\n p9_client_rpc+0x1314/0x1340 net/9p/client.c:754\n p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031\n v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410\n v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122\n legacy_get_tree+0x114/0x290 fs/fs_context.c:662\n vfs_get_tree+0xa7/0x570 fs/super.c:1797\n do_new_mount+0x71f/0x15e0 fs/namespace.c:3352\n path_mount+0x742/0x1f20 fs/namespace.c:3679\n do_mount fs/namespace.c:3692 [inline]\n __do_sys_mount fs/namespace.c:3898 [inline]\n __se_sys_mount+0x725/0x810 fs/namespace.c:3875\n __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nUninit was created at:\n __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598\n __alloc_pages_node include/linux/gfp.h:238 [inline]\n alloc_pages_node include/linux/gfp.h:261 [inline]\n alloc_slab_page mm/slub.c:2175 [inline]\n allocate_slab mm/slub.c:2338 [inline]\n new_slab+0x2de/0x1400 mm/slub.c:2391\n ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525\n __slab_alloc mm/slub.c:3610 [inline]\n __slab_alloc_node mm/slub.c:3663 [inline]\n slab_alloc_node mm/slub.c:3835 [inline]\n kmem_cache_alloc+0x6d3/0xbe0 mm/slub.c:3852\n p9_tag_alloc net/9p/client.c:278 [inline]\n p9_client_prepare_req+0x20a/0x1770 net/9p/client.c:641\n p9_client_rpc+0x27e/0x1340 net/9p/client.c:688\n p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031\n v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410\n v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122\n legacy_get_tree+0x114/0x290 fs/fs_context.c:662\n vfs_get_tree+0xa7/0x570 fs/super.c:1797\n do_new_mount+0x71f/0x15e0 fs/namespace.c:3352\n path_mount+0x742/0x1f20 fs/namespace.c:3679\n do_mount fs/namespace.c:3692 [inline]\n __do_sys_mount fs/namespace.c:3898 [inline]\n __se_sys_mount+0x725/0x810 fs/namespace.c:3875\n __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875\n do_syscall_64+0xd5/0x1f0\n entry_SYSCALL_64_after_hwframe+0x6d/0x75\n\nIf p9_check_errors() fails early in p9_client_rpc(), req->rc.tag\nwill not be properly initialized. However, trace_9p_client_res()\nends up trying to print it out anyway before p9_client_rpc()\nfinishes.\n\nFix this issue by assigning default values to p9_fcall fields\nsuch as 'tag' and (just in case KMSAN unearths something new) 'id'\nduring the tag allocation stage.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.1.54-1+rpt2",
        "1:6.1.58-1+rpt2",
        "1:6.1.63-1+rpt1",
        "1:6.1.73-1+rpt1",
        "1:6.6.20-1+rpt1",
        "1:6.6.28-1+rpt1",
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            "assessment": "upstream version (no usable Linux commit)",
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-39301"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72c5d8e416ecc46af370a1340b3db5ff0b0cc867"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2101901dd58c6da4924bc5efb217a1d83436290b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/124947855564572713d705a13be7d0c9dae16a17"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/89969ffbeb948ffc159d19252e7469490103011b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ca71f204711ad24113e8b344dc5bb8b0385f5672"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6c1791130b781c843572fb6391c4a4c5d857ab17"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fe5c604053c36c62af24eee8a76407d026ea5163"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/25460d6f39024cc3b8241b14c7ccf0d6f11a736a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}