CVE-2024-46679

Summary

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

ethtool: check device is present when getting link settings

A sysfs reader can race with a device reset or removal, attempting to read device state when the device is not actually present. eg:

 [exception RIP: qed_get_current_link+17]

#8 [ffffb9e4f2907c48] qede_get_link_ksettings at ffffffffc07a994a [qede] #9 [ffffb9e4f2907cd8] __rh_call_get_link_ksettings at ffffffff992b01a3 #10 [ffffb9e4f2907d38] __ethtool_get_link_ksettings at ffffffff992b04e4 #11 [ffffb9e4f2907d90] duplex_show at ffffffff99260300 #12 [ffffb9e4f2907e38] dev_attr_show at ffffffff9905a01c #13 [ffffb9e4f2907e50] sysfs_kf_seq_show at ffffffff98e0145b #14 [ffffb9e4f2907e68] seq_read at ffffffff98d902e3 #15 [ffffb9e4f2907ec8] vfs_read at ffffffff98d657d1 #16 [ffffb9e4f2907f00] ksys_read at ffffffff98d65c3f #17 [ffffb9e4f2907f38] do_syscall_64 at ffffffff98a052fb

crash> struct net_device.state ffff9a9d21336000 state = 5,

state 5 is __LINK_STATE_START (0b1) and __LINK_STATE_NOCARRIER (0b100). The device is not present, note lack of __LINK_STATE_PRESENT (0b10).

This is the same sort of panic as observed in commit 4224cfd7fb65 ("net-sysfs: add check for netdevice being present to speed_show").

There are many other callers of __ethtool_get_link_ksettings() which don't have a device presence check.

Move this check into ethtool to protect all callers.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < ec7b4f7f644018ac293cb1b02528a40a32917e62affected
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < 842a40c7273ba1c1cb30dda50405b328de1d860eaffected
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < 7a8d98b6d6484d3ad358510366022da080c37cbcaffected
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < 9bba5955eed160102114d4cc00c3d399be9bdae4affected
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < 94ab317024ba373d37340893d1c0358638935fbbaffected
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < 1d6d9b5b1b95bfeccb84386a51b7e6c510ec13b2affected
LinuxLinuxd519e17e2d01a0ee9abe083019532061b4438065 < a699781c79ecf6cfe67fb00a0331b4088c7c8466affected
LinuxLinux2.6.33affected
LinuxLinux0 < 2.6.33unaffected
LinuxLinux5.4.283 <= 5.4.*unaffected
LinuxLinux5.10.225 <= 5.10.*unaffected
LinuxLinux5.15.166 <= 5.15.*unaffected
LinuxLinux6.1.108 <= 6.1.*unaffected
LinuxLinux6.6.49 <= 6.6.*unaffected
LinuxLinux6.10.8 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

Additional References

References