CVE-2022-49865

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network When copying a `struct ifaddrlblmsg` to the network, __ifal_reserved remained uninitialized, resulting in a 1-byte infoleak: BUG: KMSAN: kernel-network-infoleak in __netdev_start_xmit ./include/linux/netdevice.h:4841 __netdev_start_xmit ./include/linux/netdevice.h:4841 netdev_start_xmit ./include/linux/netdevice.h:4857 xmit_one net/core/dev.c:3590 dev_hard_start_xmit+0x1dc/0x800 net/core/dev.c:3606 __dev_queue_xmit+0x17e8/0x4350 net/core/dev.c:4256 dev_queue_xmit ./include/linux/netdevice.h:3009 __netlink_deliver_tap_skb net/netlink/af_netlink.c:307 __netlink_deliver_tap+0x728/0xad0 net/netlink/af_netlink.c:325 netlink_deliver_tap net/netlink/af_netlink.c:338 __netlink_sendskb net/netlink/af_netlink.c:1263 netlink_sendskb+0x1d9/0x200 net/netlink/af_netlink.c:1272 netlink_unicast+0x56d/0xf50 net/netlink/af_netlink.c:1360 nlmsg_unicast ./include/net/netlink.h:1061 rtnl_unicast+0x5a/0x80 net/core/rtnetlink.c:758 ip6addrlbl_get+0xfad/0x10f0 net/ipv6/addrlabel.c:628 rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082 ... Uninit was created at: slab_post_alloc_hook+0x118/0xb00 mm/slab.h:742 slab_alloc_node mm/slub.c:3398 __kmem_cache_alloc_node+0x4f2/0x930 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 __alloc_skb+0x27a/0xab0 net/core/skbuff.c:509 alloc_skb ./include/linux/skbuff.h:1267 nlmsg_new ./include/net/netlink.h:964 ip6addrlbl_get+0x490/0x10f0 net/ipv6/addrlabel.c:608 rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082 netlink_rcv_skb+0x299/0x550 net/netlink/af_netlink.c:2540 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6109 netlink_unicast_kernel net/netlink/af_netlink.c:1319 netlink_unicast+0x9ab/0xf50 net/netlink/af_netlink.c:1345 netlink_sendmsg+0xebc/0x10f0 net/netlink/af_netlink.c:1921 ... This patch ensures that the reserved field is always initialized.

Reserved 2025-05-01 | Published 2025-05-01 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

2a8cc6c89039e0530a3335954253b76ed0f9339a before 568a47ff756f913e8b374c2af9d22cd2c772c744
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before 0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before 6d26d0587abccb9835382a0b53faa7b9b1cd83e3
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before 58cd7fdc8c1e6c7873acc08f190069fed88d1c12
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before a033b86c7f7621fde31f0364af8986f43b44914f
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before 2acb2779b147decd300c117683d5a32ce61c75d6
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before 49e92ba5ecd7d72ba369dde2ccff738edd028a47
affected

2a8cc6c89039e0530a3335954253b76ed0f9339a before c23fb2c82267638f9d206cb96bb93e1f93ad7828
affected

Default status
affected

2.6.25
affected

Any version before 2.6.25
unaffected

4.9.334
unaffected

4.14.300
unaffected

4.19.267
unaffected

5.4.225
unaffected

5.10.155
unaffected

5.15.79
unaffected

6.0.9
unaffected

6.1
unaffected

References

git.kernel.org/...c/568a47ff756f913e8b374c2af9d22cd2c772c744

git.kernel.org/...c/0f85b7ae7c4b5d7b4bbf7ac653a733c181a8a2bf

git.kernel.org/...c/6d26d0587abccb9835382a0b53faa7b9b1cd83e3

git.kernel.org/...c/58cd7fdc8c1e6c7873acc08f190069fed88d1c12

git.kernel.org/...c/a033b86c7f7621fde31f0364af8986f43b44914f

git.kernel.org/...c/2acb2779b147decd300c117683d5a32ce61c75d6

git.kernel.org/...c/49e92ba5ecd7d72ba369dde2ccff738edd028a47

git.kernel.org/...c/c23fb2c82267638f9d206cb96bb93e1f93ad7828

cve.org (CVE-2022-49865)

nvd.nist.gov (CVE-2022-49865)

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