Description
In the Linux kernel, the following vulnerability has been resolved: af_netlink: Fix shift out of bounds in group mask calculation When a netlink message is received, netlink_recvmsg() fills in the address of the sender. One of the fields is the 32-bit bitfield nl_groups, which carries the multicast group on which the message was received. The least significant bit corresponds to group 1, and therefore the highest group that the field can represent is 32. Above that, the UB sanitizer flags the out-of-bounds shift attempts. Which bits end up being set in such case is implementation defined, but it's either going to be a wrong non-zero value, or zero, which is at least not misleading. Make the latter choice deterministic by always setting to 0 for higher-numbered multicast groups. To get information about membership in groups >= 32, userspace is expected to use nl_pktinfo control messages[0], which are enabled by NETLINK_PKTINFO socket option. [0] https://lwn.net/Articles/147608/ The way to trigger this issue is e.g. through monitoring the BRVLAN group: # bridge monitor vlan & # ip link add name br type bridge Which produces the following citation: UBSAN: shift-out-of-bounds in net/netlink/af_netlink.c:162:19 shift exponent 32 is too large for 32-bit type 'int'
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
f7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < e1c5d46f05aa23d740daae5cd3a6472145afac42affectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < ac5883a8890a11c00b32a19949a25d4afeaa2f5aaffectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < f75f4abeec4c04b600a15b50c89a481f1e7435eeaffectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < 41249fff507387c3323b198d0052faed08b14de4affectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < b0898362188e05b2202656058cc32d98fabf3bacaffectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < 7409ff6393a67ff9838d0ae1bd102fb5f020d07aaffectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < e8aaf3134bc5e943048eefe9f2ddaabf41d92b1aaffectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < e23e1e981247feb3c7d0236fe58aceb685f234aeaffectedf7fa9b10edbb9391bdd4ec8e8b3d621d0664b198 to < 0caf6d9922192dd1afa8dc2131abfb4df1443b9faffected
Linux Linux
Default version status: affected
2.6.14affected0 to < 2.6.14unaffected4.9.311 to ≤ 4.9.*unaffected4.14.276 to ≤ 4.14.*unaffected4.19.238 to ≤ 4.19.*unaffected5.4.189 to ≤ 5.4.*unaffected5.10.110 to ≤ 5.10.*unaffected5.15.33 to ≤ 5.15.*unaffected5.16.19 to ≤ 5.16.*unaffected5.17.2 to ≤ 5.17.*unaffected5.18 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e1c5d46f05aa23d740daae5cd3a6472145afac42 ↗
- https://git.kernel.org/stable/c/ac5883a8890a11c00b32a19949a25d4afeaa2f5a ↗
- https://git.kernel.org/stable/c/f75f4abeec4c04b600a15b50c89a481f1e7435ee ↗
- https://git.kernel.org/stable/c/41249fff507387c3323b198d0052faed08b14de4 ↗
- https://git.kernel.org/stable/c/b0898362188e05b2202656058cc32d98fabf3bac ↗
- https://git.kernel.org/stable/c/7409ff6393a67ff9838d0ae1bd102fb5f020d07a ↗
- https://git.kernel.org/stable/c/e8aaf3134bc5e943048eefe9f2ddaabf41d92b1a ↗
- https://git.kernel.org/stable/c/e23e1e981247feb3c7d0236fe58aceb685f234ae ↗
- https://git.kernel.org/stable/c/0caf6d9922192dd1afa8dc2131abfb4df1443b9f ↗