CVE-2024-46679: ethtool: check device is present when getting link settings
First published: Fri Sep 13 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=2.6.33<5.4.283 | |
| Linux Linux kernel | >=5.5<5.10.225 | |
| Linux Linux kernel | >=5.11<5.15.166 | |
| Linux Linux kernel | >=5.16<6.1.108 | |
| Linux Linux kernel | >=6.2<6.6.49 | |
| Linux Linux kernel | >=6.7<6.10.8 | |
| Linux Linux kernel | =6.11-rc1 | |
| Linux Linux kernel | =6.11-rc2 | |
| Linux Linux kernel | =6.11-rc3 | |
| Linux Linux kernel | =6.11-rc4 | |
| Linux Linux kernel | =6.11-rc5 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 |
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Reference Links
- https://git.kernel.org/stable/c/1d6d9b5b1b95bfeccb84386a51b7e6c510ec13b2
- https://git.kernel.org/stable/c/7a8d98b6d6484d3ad358510366022da080c37cbc
- https://git.kernel.org/stable/c/842a40c7273ba1c1cb30dda50405b328de1d860e
- https://git.kernel.org/stable/c/94ab317024ba373d37340893d1c0358638935fbb
- https://git.kernel.org/stable/c/9bba5955eed160102114d4cc00c3d399be9bdae4
- https://git.kernel.org/stable/c/a699781c79ecf6cfe67fb00a0331b4088c7c8466
- https://git.kernel.org/stable/c/ec7b4f7f644018ac293cb1b02528a40a32917e62
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46679
- https://nvd.nist.gov/vuln/detail/CVE-2024-46679
- https://launchpad.net/bugs/cve/CVE-2024-46679
- https://security-tracker.debian.org/tracker/CVE-2024-46679
- https://ubuntu.com/security/CVE-2024-46679
- https://git.kernel.org/linus/a699781c79ecf6cfe67fb00a0331b4088c7c8466
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