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LinuxCVE-2022-48865

HistoryJul 16, 2024 - 1:15 p.m.

CVE-2022-48865

2024-07-1613:15:13

CWE-476

Linux

web.nvd.nist.gov

linux kernel

vulnerability

kernel panic

enabling bearer

tipc

null-pointer dereference

monitoring data

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

AI Score

6.3

Confidence

High

EPSS

Percentile

5.1%

JSON

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix kernel panic when enabling bearer

When enabling a bearer on a node, a kernel panic is observed:

[ 4.498085] RIP: 0010:tipc_mon_prep+0x4e/0x130 [tipc]
…
[ 4.520030] Call Trace:
[ 4.520689] <IRQ>
[ 4.521236] tipc_link_build_proto_msg+0x375/0x750 [tipc]
[ 4.522654] tipc_link_build_state_msg+0x48/0xc0 [tipc]
[ 4.524034] __tipc_node_link_up+0xd7/0x290 [tipc]
[ 4.525292] tipc_rcv+0x5da/0x730 [tipc]
[ 4.526346] ? __netif_receive_skb_core+0xb7/0xfc0
[ 4.527601] tipc_l2_rcv_msg+0x5e/0x90 [tipc]
[ 4.528737] __netif_receive_skb_list_core+0x20b/0x260
[ 4.530068] netif_receive_skb_list_internal+0x1bf/0x2e0
[ 4.531450] ? dev_gro_receive+0x4c2/0x680
[ 4.532512] napi_complete_done+0x6f/0x180
[ 4.533570] virtnet_poll+0x29c/0x42e [virtio_net]
…

The node in question is receiving activate messages in another
thread after changing bearer status to allow message sending/
receiving in current thread:

     thread 1           |              thread 2
     --------           |              --------
                        |

tipc_enable_bearer() |
test_and_set_bit_lock() |
tipc_bearer_xmit_skb() |
| tipc_l2_rcv_msg()
| tipc_rcv()
| __tipc_node_link_up()
| tipc_link_build_state_msg()
| tipc_link_build_proto_msg()
| tipc_mon_prep()
| {
| …
| // null-pointer dereference
| u16 gen = mon->dom_gen;
| …
| }
// Not being executed yet |
tipc_mon_create() |
{ |
… |
// allocate |
mon = kzalloc(); |
… |
} |

Monitoring pointer in thread 2 is dereferenced before monitoring data
is allocated in thread 1. This causes kernel panic.

This commit fixes it by allocating the monitoring data before enabling
the bearer to receive messages.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange4.8–5.10.106

linuxlinux_kernelRange5.11–5.15.29

linuxlinux_kernelRange5.16–5.16.15

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/tipc/bearer.c"
    ],
    "versions": [
      {
        "version": "35c55c9877f8",
        "lessThan": "2de76d37d4a6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "35c55c9877f8",
        "lessThan": "f96dc3adb9a9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "35c55c9877f8",
        "lessThan": "f4f59fdbc748",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "35c55c9877f8",
        "lessThan": "be4977b847f5",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/tipc/bearer.c"
    ],
    "versions": [
      {
        "version": "4.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.8",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.106",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.29",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16.15",
        "lessThanOrEqual": "5.16.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.17",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]