In the Linux kernel, the following vulnerability has been resolved:
xfrm: add NULL check in xfrm_update_ae_params
Normally, x->replay_esn and x->preplay_esn should be allocated at xfrm_alloc_replay_state_esn(...) in xfrm_state_construct(...), hence the xfrm_update_ae_params(...) is okay to update them. However, the current implementation of xfrm_new_ae(...) allows a malicious user to directly dereference a NULL pointer and crash the kernel like below.
BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 8253067 P4D 8253067 PUD 8e0e067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 PID: 98 Comm: poc.npd Not tainted 6.4.0-rc7-00072-gdad9774deaf1 #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.o4 RIP: 0010:memcpy_orig+0xad/0x140 Code: e8 4c 89 5f e0 48 8d 7f e0 73 d2 83 c2 20 48 29 d6 48 29 d7 83 fa 10 72 34 4c 8b 06 4c 8b 4e 08 c RSP: 0018:ffff888008f57658 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff888008bd0000 RCX: ffffffff8238e571 RDX: 0000000000000018 RSI: ffff888007f64844 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888008f57818 R13: ffff888007f64aa4 R14: 0000000000000000 R15: 0000000000000000 FS: 00000000014013c0(0000) GS:ffff88806d600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000054d8000 CR4: 00000000000006f0 Call Trace: <TASK> ? __die+0x1f/0x70 ? page_fault_oops+0x1e8/0x500 ? __pfx_is_prefetch.constprop.0+0x10/0x10 ? __pfx_page_fault_oops+0x10/0x10 ? _raw_spin_unlock_irqrestore+0x11/0x40 ? fixup_exception+0x36/0x460 ? _raw_spin_unlock_irqrestore+0x11/0x40 ? exc_page_fault+0x5e/0xc0 ? asm_exc_page_fault+0x26/0x30 ? xfrm_update_ae_params+0xd1/0x260 ? memcpy_orig+0xad/0x140 ? __pfx__raw_spin_lock_bh+0x10/0x10 xfrm_update_ae_params+0xe7/0x260 xfrm_new_ae+0x298/0x4e0 ? __pfx_xfrm_new_ae+0x10/0x10 ? __pfx_xfrm_new_ae+0x10/0x10 xfrm_user_rcv_msg+0x25a/0x410 ? __pfx_xfrm_user_rcv_msg+0x10/0x10 ? __alloc_skb+0xcf/0x210 ? stack_trace_save+0x90/0xd0 ? filter_irq_stacks+0x1c/0x70 ? __stack_depot_save+0x39/0x4e0 ? __kasan_slab_free+0x10a/0x190 ? kmem_cache_free+0x9c/0x340 ? netlink_recvmsg+0x23c/0x660 ? sock_recvmsg+0xeb/0xf0 ? __sys_recvfrom+0x13c/0x1f0 ? __x64_sys_recvfrom+0x71/0x90 ? do_syscall_64+0x3f/0x90 ? entry_SYSCALL_64_after_hwframe+0x72/0xdc ? copyout+0x3e/0x50 netlink_rcv_skb+0xd6/0x210 ? __pfx_xfrm_user_rcv_msg+0x10/0x10 ? __pfx_netlink_rcv_skb+0x10/0x10 ? __pfx_sock_has_perm+0x10/0x10 ? mutex_lock+0x8d/0xe0 ? __pfx_mutex_lock+0x10/0x10 xfrm_netlink_rcv+0x44/0x50 netlink_unicast+0x36f/0x4c0 ? __pfx_netlink_unicast+0x10/0x10 ? netlink_recvmsg+0x500/0x660 netlink_sendmsg+0x3b7/0x700
This Null-ptr-deref bug is assigned CVE-2023-3772. And this commit adds additional NULL check in xfrm_update_ae_params to fix the NPD.
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:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-livepatch-5.15.128-80.144Upgrade kernel-headersUpgrade perfUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-livepatch-5.10.192-182.736Upgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-livepatch-4.14.326-245.539Upgrade kernel-debuginfo-common-aarch64 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-headersUpgrade kernel-libbpf-staticUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-libbpfUpgrade kernel-libbpf-develUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.49-69.116Upgrade bpftool-debuginfoUpgrade perfUpgrade kernel-toolsUpgrade python3-perfUpgrade bpftoolUpgrade python3-perf-debuginfoUpgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfo | Sep 30, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution existsUpgrade kernel | Nov 14, 2025 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-intel-iotgUpgrade linux-oracleUpgrade linux-azure-5.4Upgrade linux-kvmUpgrade linux-gcp-4.15Upgrade linux-lts-xenialUpgrade linux-gcpUpgrade linux-azure-5.15Upgrade linux-ibmUpgrade linux-nvidia-tegra-igxUpgrade linux-oracle-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-hweUpgrade linux-gcp-5.15Upgrade linux-gkeopUpgrade linux-intel-iot-realtimeUpgrade linux-azure-4.15Upgrade linux-aws-fipsUpgrade linux-gcp-fipsUpgrade linux-intel-iotg-5.15Upgrade linux-azure-fipsUpgrade linux-gcp-5.4Upgrade linux-hwe-5.4Upgrade linux-hwe-5.15Upgrade linux-azureUpgrade linux-nvidiaUpgrade linux-iotUpgrade linux-bluefieldUpgrade linux-awsUpgrade linux-aws-hweUpgrade linux-oracle-5.4Upgrade linux-aws-5.4Upgrade linuxUpgrade linux-aws-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-riscv-5.15Upgrade linux-ibm-5.15Upgrade linux-gkeUpgrade linux-nvidia-tegraUpgrade linux-lowlatencyUpgrade linux-realtimeUpgrade linux-ibm-5.4Upgrade linux-raspiUpgrade linux-nvidia-tegra-5.15Upgrade linux-raspi-5.4Upgrade linux-fips | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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