In the Linux kernel, the following vulnerability has been resolved:
inet_diag: fix kernel-infoleak for UDP sockets
KMSAN reported a kernel-infoleak [1], that can exploited by unpriv users.
After analysis it turned out UDP was not initializing r->idiag_expires. Other users of inet_sk_diag_fill() might make the same mistake in the future, so fix this in inet_sk_diag_fill().
[1] BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline] BUG: KMSAN: kernel-infoleak in copyout lib/iov_iter.c:156 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:156 [inline] _copy_to_iter+0x69d/0x25c0 lib/iov_iter.c:670 copy_to_iter include/linux/uio.h:155 [inline] simple_copy_to_iter+0xf3/0x140 net/core/datagram.c:519 __skb_datagram_iter+0x2cb/0x1280 net/core/datagram.c:425 skb_copy_datagram_iter+0xdc/0x270 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3657 [inline] netlink_recvmsg+0x660/0x1c60 net/netlink/af_netlink.c:1974 sock_recvmsg_nosec net/socket.c:944 [inline] sock_recvmsg net/socket.c:962 [inline] sock_read_iter+0x5a9/0x630 net/socket.c:1035 call_read_iter include/linux/fs.h:2156 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x1631/0x1980 fs/read_write.c:481 ksys_read+0x28c/0x520 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0xdb/0x120 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae
Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x545/0xf90 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] netlink_dump+0x3d5/0x16a0 net/netlink/af_netlink.c:2245 __netlink_dump_start+0xd1c/0xee0 net/netlink/af_netlink.c:2370 netlink_dump_start include/linux/netlink.h:254 [inline] inet_diag_handler_cmd+0x2e7/0x400 net/ipv4/inet_diag.c:1343 sock_diag_rcv_msg+0x24a/0x620 netlink_rcv_skb+0x447/0x800 net/netlink/af_netlink.c:2491 sock_diag_rcv+0x63/0x80 net/core/sock_diag.c:276 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x1095/0x1360 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x16f3/0x1870 net/netlink/af_netlink.c:1916 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] sock_write_iter+0x594/0x690 net/socket.c:1057 do_iter_readv_writev+0xa7f/0xc70 do_iter_write+0x52c/0x1500 fs/read_write.c:851 vfs_writev fs/read_write.c:924 [inline] do_writev+0x63f/0xe30 fs/read_write.c:967 __do_sys_writev fs/read_write.c:1040 [inline] __se_sys_writev fs/read_write.c:1037 [inline] __x64_sys_writev+0xe5/0x120 fs/read_write.c:1037 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae
Bytes 68-71 of 312 are uninitialized Memory access of size 312 starts at ffff88812ab54000 Data copied to user address 0000000020001440
CPU: 1 PID: 6365 Comm: syz-executor801 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-headersUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-livepatch-5.10.93-87.444Upgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade perfUpgrade perf-debuginfoUpgrade python-perf | Aug 2, 2024 | Jun 19, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Jun 19, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernel-tools | Oct 8, 2024 | Jun 19, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel | Oct 8, 2024 | Jun 19, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 19, 2024 |
| Suse | — | Upgrade kselftests-kmp-azureUpgrade kernel-rt-optionalUpgrade kernel-devel-azureUpgrade kernel-azure-optionalUpgrade kernel-azure-develUpgrade kernel-rt_debug-develUpgrade kernel-rt_debugUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-syms-azureUpgrade ocfs2-kmp-azureUpgrade kernel-source-azureUpgrade kernel-source-rtUpgrade kernel-rt-extraUpgrade kernel-azure-extraUpgrade cluster-md-kmp-azureUpgrade kernel-azureUpgrade kernel-rt-vdsoUpgrade gfs2-kmp-azureUpgrade kernel-azure-livepatch-develUpgrade kernel-azure-vdsoUpgrade cluster-md-kmp-rtUpgrade kernel-rt-livepatchUpgrade kernel-rt-livepatch-develUpgrade gfs2-kmp-rtUpgrade kselftests-kmp-rtUpgrade reiserfs-kmp-azureUpgrade kernel-devel-rtUpgrade dlm-kmp-azureUpgrade kernel-syms-rtUpgrade kernel-rt_debug-vdsoUpgrade ocfs2-kmp-rtUpgrade reiserfs-kmp-rtUpgrade kernel-rt-develUpgrade dlm-kmp-rtUpgrade kernel-rt | Aug 9, 2024 | Jun 19, 2024 |
| Ubuntu | — | Upgrade linux-raspiUpgrade linux-azureUpgrade linux-fipsUpgrade linux-oracle-5.4Upgrade linux-aws-5.4Upgrade linux-oracleUpgrade linux-aws-fipsUpgrade linux-bluefieldUpgrade linux-kvmUpgrade linux-ibm-5.4Upgrade linux-gcpUpgrade linux-azure-5.4Upgrade linux-hwe-5.4Upgrade linux-gcp-fipsUpgrade linux-ibmUpgrade linux-gkeopUpgrade linux-awsUpgrade linux-raspi-5.4Upgrade linux-gcp-5.4Upgrade linuxUpgrade linux-azure-fips | Nov 19, 2024 | Jun 19, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 19, 2024 |
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