NULL Pointer Dereference in kernel-rt-debug-kvm | CVE-2022-48850

Q: How to fix?

There is no fixed version for RHEL:9 kernel-rt-debug-kvm .

Threat Intelligence

0.04% (6^th percentile)

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Snyk IDSNYK-RHEL9-KERNELRTDEBUGKVM-7468926
published17 Jul 2024
disclosed16 Jul 2024

Report a new vulnerability Found a mistake?

Introduced: 16 Jul 2024

CVE-2022-48850 (opens in a new tab) CWE-476 (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 kernel-rt-debug-kvm.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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

net-sysfs: add check for netdevice being present to speed_show

When bringing down the netdevice or system shutdown, a panic can be triggered while accessing the sysfs path because the device is already removed.

[  755.549084] mlx5_core 0000:12:00.1: Shutdown was called
[  756.404455] mlx5_core 0000:12:00.0: Shutdown was called
...
[  757.937260] BUG: unable to handle kernel NULL pointer dereference at           (null)
[  758.031397] IP: [&lt;ffffffff8ee11acb&gt;] dma_pool_alloc+0x1ab/0x280

crash&gt; bt
...
PID: 12649  TASK: ffff8924108f2100  CPU: 1   COMMAND: &#34;amsd&#34;
...
 #9 [ffff89240e1a38b0] page_fault at ffffffff8f38c778
    [exception RIP: dma_pool_alloc+0x1ab]
    RIP: ffffffff8ee11acb  RSP: ffff89240e1a3968  RFLAGS: 00010046
    RAX: 0000000000000246  RBX: ffff89243d874100  RCX: 0000000000001000
    RDX: 0000000000000000  RSI: 0000000000000246  RDI: ffff89243d874090
    RBP: ffff89240e1a39c0   R8: 000000000001f080   R9: ffff8905ffc03c00
    R10: ffffffffc04680d4  R11: ffffffff8edde9fd  R12: 00000000000080d0
    R13: ffff89243d874090  R14: ffff89243d874080  R15: 0000000000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#10 [ffff89240e1a39c8] mlx5_alloc_cmd_msg at ffffffffc04680f3 [mlx5_core]
#11 [ffff89240e1a3a18] cmd_exec at ffffffffc046ad62 [mlx5_core]
#12 [ffff89240e1a3ab8] mlx5_cmd_exec at ffffffffc046b4fb [mlx5_core]
#13 [ffff89240e1a3ae8] mlx5_core_access_reg at ffffffffc0475434 [mlx5_core]
#14 [ffff89240e1a3b40] mlx5e_get_fec_caps at ffffffffc04a7348 [mlx5_core]
#15 [ffff89240e1a3bb0] get_fec_supported_advertised at ffffffffc04992bf [mlx5_core]
#16 [ffff89240e1a3c08] mlx5e_get_link_ksettings at ffffffffc049ab36 [mlx5_core]
#17 [ffff89240e1a3ce8] __ethtool_get_link_ksettings at ffffffff8f25db46
#18 [ffff89240e1a3d48] speed_show at ffffffff8f277208
#19 [ffff89240e1a3dd8] dev_attr_show at ffffffff8f0b70e3
#20 [ffff89240e1a3df8] sysfs_kf_seq_show at ffffffff8eedbedf
#21 [ffff89240e1a3e18] kernfs_seq_show at ffffffff8eeda596
#22 [ffff89240e1a3e28] seq_read at ffffffff8ee76d10
#23 [ffff89240e1a3e98] kernfs_fop_read at ffffffff8eedaef5
#24 [ffff89240e1a3ed8] vfs_read at ffffffff8ee4e3ff
#25 [ffff89240e1a3f08] sys_read at ffffffff8ee4f27f
#26 [ffff89240e1a3f50] system_call_fastpath at ffffffff8f395f92
crash&gt; net_device.state ffff89443b0c0000
  state = 0x5  (__LINK_STATE_START| __LINK_STATE_NOCARRIER)

To prevent this scenario, we also make sure that the netdevice is present.

References

CVSS Scores

version 3.1

Attack Vector (AV)
Local
Attack Complexity (AC)
Low
Privileges Required (PR)
Low
User Interaction (UI)
None

Scope (S)
Unchanged

Confidentiality (C)
None
Integrity (I)
None
Availability (A)
High

NULL Pointer Dereference Affecting kernel-rt-debug-kvm package, versions *

Severity