CVE-2024-27414 — rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back

Description (CNA)

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 (CNA)

Vendor / product	Versions
Linux / Linux	affected ad46d4861ed36315d3d9e838723ba3e367ecc042 before b9fbc44159dfc3e9a7073032752d9e03f5194a6f; affected abb0172fa8dc4a4ec51aa992b7269ed65959f310 before 882a51a10ecf24ce135d573afa0872aef02c5125; affected 047508edd602921ee8bb0f2aa2100aa2e9bedc75 before a1227b27fcccc99dc44f912b479e01a17e2d7d31; affected 8dfac8071d58447e5cace4c4c6fe493ce2f615f6 before f2261eb994aa5757c1da046b78e3229a3ece0ad9; affected d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f before 167d8642daa6a44b51de17f8ff0f584e1e762db7; affected d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f before 831bc2728fb48a8957a824cba8c264b30dca1425; affected d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f before 743ad091fb46e622f1b690385bb15e3cd3daf874; affected 00757f58e37b2d9a6f99e15be484712390cd2bab; affected 5.4.253 before 5.4.271; affected 5.10.190 before 5.10.212; affected 5.15.126 before 5.15.151; affected 6.1.45 before 6.1.81; affected 6.4.10 before 6.5
Linux / Linux	affected 6.5; unaffected 0 before 6.5; unaffected 5.4.271 through 5.4.; unaffected 5.10.212 through 5.10.; unaffected 5.15.151 through 5.15.; unaffected 6.1.81 through 6.1.; unaffected 6.6.21 through 6.6.; unaffected 6.7.9 through 6.7.; unaffected 6.8 through *

Vendor / product

Versions

Linux / Linux

affected ad46d4861ed36315d3d9e838723ba3e367ecc042 before b9fbc44159dfc3e9a7073032752d9e03f5194a6f; affected abb0172fa8dc4a4ec51aa992b7269ed65959f310 before 882a51a10ecf24ce135d573afa0872aef02c5125; affected 047508edd602921ee8bb0f2aa2100aa2e9bedc75 before a1227b27fcccc99dc44f912b479e01a17e2d7d31; affected 8dfac8071d58447e5cace4c4c6fe493ce2f615f6 before f2261eb994aa5757c1da046b78e3229a3ece0ad9; affected d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f before 167d8642daa6a44b51de17f8ff0f584e1e762db7; affected d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f before 831bc2728fb48a8957a824cba8c264b30dca1425; affected d73ef2d69c0dba5f5a1cb9600045c873bab1fb7f before 743ad091fb46e622f1b690385bb15e3cd3daf874; affected 00757f58e37b2d9a6f99e15be484712390cd2bab; affected 5.4.253 before 5.4.271; affected 5.10.190 before 5.10.212; affected 5.15.126 before 5.15.151; affected 6.1.45 before 6.1.81; affected 6.4.10 before 6.5

Linux / Linux

affected 6.5; unaffected 0 before 6.5; unaffected 5.4.271 through 5.4.*; unaffected 5.10.212 through 5.10.*; unaffected 5.15.151 through 5.15.*; unaffected 6.1.81 through 6.1.*; unaffected 6.6.21 through 6.6.*; unaffected 6.7.9 through 6.7.*; unaffected 6.8 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.