CVE-2023-53147

xfrm: add NULL check in xfrm_update_ae_params

State: Published
Severity: Not scored
Published: Sep 15, 2025
Updated: May 11, 2026
Reserved: May 2, 2025

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	d8647b79c3b7e223ac051439d165bc8e7bbb832f to before ed1cba039309c80b49719fcff3e3d7cdddb73d96Affected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 44f69c96f8a147413c23c68cda4d6fb5e23137cdAffected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 8046beb890ebc83c5820188c650073e1c6066e67Affected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before bd30aa9c7febb6e709670cd5154194189ca3b7b5Affected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 075448a2eb753f813fe873cfa52853e9fef8eedbAffected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 87b655f4936b6fc01f3658aa88a22c923b379ebdAffected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 53df4be4f5221e90dc7aa9ce745a9a21bb7024f4Affected d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 00374d9b6d9f932802b55181be9831aa948e5b7cAffected
LinuxLinux	2.6.39Affected before 2.6.39Not affected 4.14.324 through 4.14.Not affected 4.19.293 through 4.19.Not affected 5.4.255 through 5.4.Not affected 5.10.192 through 5.10.Not affected 5.15.128 through 5.15.Not affected 6.1.47 through 6.1.Not affected 6.4.12 through 6.4.*Not affected 6.5 and laterNot affected

Product

Versions

LinuxLinux

d8647b79c3b7e223ac051439d165bc8e7bbb832f to before ed1cba039309c80b49719fcff3e3d7cdddb73d96Affected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 44f69c96f8a147413c23c68cda4d6fb5e23137cdAffected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 8046beb890ebc83c5820188c650073e1c6066e67Affected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before bd30aa9c7febb6e709670cd5154194189ca3b7b5Affected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 075448a2eb753f813fe873cfa52853e9fef8eedbAffected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 87b655f4936b6fc01f3658aa88a22c923b379ebdAffected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 53df4be4f5221e90dc7aa9ce745a9a21bb7024f4Affected
d8647b79c3b7e223ac051439d165bc8e7bbb832f to before 00374d9b6d9f932802b55181be9831aa948e5b7cAffected

LinuxLinux

2.6.39Affected
before 2.6.39Not affected
4.14.324 through 4.14.*Not affected
4.19.293 through 4.19.*Not affected
5.4.255 through 5.4.*Not affected
5.10.192 through 5.10.*Not affected
5.15.128 through 5.15.*Not affected
6.1.47 through 6.1.*Not affected
6.4.12 through 6.4.*Not affected
6.5 and laterNot affected

References

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