CVE-2024-27414

Summary

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

rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back

In the commit d73ef2d69c0d ("rtnetlink: let rtnl_bridge_setlink checks IFLA_BRIDGE_MODE length"), an adjustment was made to the old loop logic in the function rtnl_bridge_setlink to enable the loop to also check the length of the IFLA_BRIDGE_MODE attribute. However, this adjustment removed the break statement and led to an error logic of the flags writing back at the end of this function.

if (have_flags) memcpy(nla_data(attr), &flags, sizeof(flags)); // attr should point to IFLA_BRIDGE_FLAGS NLA !!!

Before the mentioned commit, the attr is granted to be IFLA_BRIDGE_FLAGS. However, this is not necessarily true fow now as the updated loop will let the attr point to the last NLA, even an invalid NLA which could cause overflow writes.

This patch introduces a new variable br_flag to save the NLA pointer that points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned error logic.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxad46d4861ed36315d3d9e838723ba3e367ecc042 < b9fbc44159dfc3e9a7073032752d9e03f5194a6faffected
LinuxLinuxabb0172fa8dc4a4ec51aa992b7269ed65959f310 < 882a51a10ecf24ce135d573afa0872aef02c5125affected
LinuxLinux047508edd602921ee8bb0f2aa2100aa2e9bedc75 < a1227b27fcccc99dc44f912b479e01a17e2d7d31affected
LinuxLinux8dfac8071d58447e5cace4c4c6fe493ce2f615f6 < f2261eb994aa5757c1da046b78e3229a3ece0ad9affected
LinuxLinuxd73ef2d69c0dba5f5a1cb9600045c873bab1fb7f < 167d8642daa6a44b51de17f8ff0f584e1e762db7affected
LinuxLinuxd73ef2d69c0dba5f5a1cb9600045c873bab1fb7f < 831bc2728fb48a8957a824cba8c264b30dca1425affected
LinuxLinuxd73ef2d69c0dba5f5a1cb9600045c873bab1fb7f < 743ad091fb46e622f1b690385bb15e3cd3daf874affected
LinuxLinux00757f58e37b2d9a6f99e15be484712390cd2babaffected
LinuxLinux5.4.253 < 5.4.271affected
LinuxLinux5.10.190 < 5.10.212affected
LinuxLinux5.15.126 < 5.15.151affected
LinuxLinux6.1.45 < 6.1.81affected
LinuxLinux6.4.10 < 6.5affected
LinuxLinux6.5affected
LinuxLinux0 < 6.5unaffected
LinuxLinux5.4.271 <= 5.4.*unaffected
LinuxLinux5.10.212 <= 5.10.*unaffected
LinuxLinux5.15.151 <= 5.15.*unaffected
LinuxLinux6.1.81 <= 6.1.*unaffected
LinuxLinux6.6.21 <= 6.6.*unaffected
LinuxLinux6.7.9 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References