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CVE-2024-46679

ethtool: check device is present when getting link settings

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.283, 5.10.225, 5.15.166, 6.1.108, 6.6.49, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in ec7b4f7f644018ac293cb1b02528a40a32917e62; From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in 842a40c7273ba1c1cb30dda50405b328de1d860e; From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in 7a8d98b6d6484d3ad358510366022da080c37cbc; From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in 9bba5955eed160102114d4cc00c3d399be9bdae4; From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in 94ab317024ba373d37340893d1c0358638935fbb; From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in 1d6d9b5b1b95bfeccb84386a51b7e6c510ec13b2; From d519e17e2d01a0ee9abe083019532061b4438065 · fixed in a699781c79ecf6cfe67fb00a0331b4088c7c8466

  • Linux Linux

    2.6.33

  • KernelLinux

    From 2.6.33 · fixed in 5.4.283; From 5.5.0 · fixed in 5.10.225; From 5.11.0 · fixed in 5.15.166; From 5.16.0 · fixed in 6.1.108; From 6.2.0 · fixed in 6.6.49; From 6.7.0 · fixed in 6.10.8

References 7

git.kernel.org