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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2023-54012

net: fix stack overflow when LRO is disabled for virtual interfaces

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix stack overflow when LRO is disabled for virtual interfaces When the virtual interface's feature is updated, it synchronizes the updated feature for its own lower interface. This propagation logic should be worked as the iteration, not recursively. But it works recursively due to the netdev notification unexpectedly. This problem occurs when it disables LRO only for the team and bonding interface type. team0 | +------+------+-----+-----+ | | | | | team1 team2 team3 ... team200 If team0's LRO feature is updated, it generates the NETDEV_FEAT_CHANGE event to its own lower interfaces(team1 ~ team200). It is worked by netdev_sync_lower_features(). So, the NETDEV_FEAT_CHANGE notification logic of each lower interface work iteratively. But generated NETDEV_FEAT_CHANGE event is also sent to the upper interface too. upper interface(team0) generates the NETDEV_FEAT_CHANGE event for its own lower interfaces again. lower and upper interfaces receive this event and generate this event again and again. So, the stack overflow occurs. But it is not the infinite loop issue. Because the netdev_sync_lower_features() updates features before generating the NETDEV_FEAT_CHANGE event. Already synchronized lower interfaces skip notification logic. So, it is just the problem that iteration logic is changed to the recursive unexpectedly due to the notification mechanism. Reproducer: ip link add team0 type team ethtool -K team0 lro on for i in {1..200} do ip link add team$i master team0 type team ethtool -K team$i lro on done ethtool -K team0 lro off In order to fix it, the notifier_ctx member of bonding/team is introduced.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • fd867d51f889aec11cca235ebb008578780d052d to < 9ea0c5f90a27b5b884d880e146e0f65f3052e401affected
  • fd867d51f889aec11cca235ebb008578780d052d to < 4bb955c4d2830a58c08e2a48ab75d75368e3ff36affected
  • fd867d51f889aec11cca235ebb008578780d052d to < cf3b5cd7127cc10c5b12400c545f263f0e5e715caffected
  • fd867d51f889aec11cca235ebb008578780d052d to < ed66e6327a69fec95034cda2ac5b6a57b8b3b622affected
  • fd867d51f889aec11cca235ebb008578780d052d to < 6bf00bb3dc7e5b9fb05488e11616e65d64e975faaffected
  • fd867d51f889aec11cca235ebb008578780d052d to < ae9b15fbe63447bc1d3bba3769f409d17ca6fdf6affected

Linux Linux

Default version status: affected

  • 4.4affected
  • 0 to < 4.4unaffected
  • 5.4.244 to ≤ 5.4.*unaffected
  • 5.10.181 to ≤ 5.10.*unaffected
  • 5.15.114 to ≤ 5.15.*unaffected
  • 6.1.31 to ≤ 6.1.*unaffected
  • 6.3.5 to ≤ 6.3.*unaffected
  • 6.4 to ≤ *unaffected

References