xfrm: add NULL check in xfrm_update_ae_params

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

EPSS (exploitation in 30 days)

0.16% · top 95% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

• CWE-476 (opens in a new tab)All about CWE-476 and its CVEs

Affected products

• Linux · Linux

  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < ed1cba039309c80b49719fcff3e3d7cdddb73d96
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < 44f69c96f8a147413c23c68cda4d6fb5e23137cd
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < 8046beb890ebc83c5820188c650073e1c6066e67
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < bd30aa9c7febb6e709670cd5154194189ca3b7b5
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < 075448a2eb753f813fe873cfa52853e9fef8eedb
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < 87b655f4936b6fc01f3658aa88a22c923b379ebd
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < 53df4be4f5221e90dc7aa9ce745a9a21bb7024f4
  • affected d8647b79c3b7e223ac051439d165bc8e7bbb832f – < 00374d9b6d9f932802b55181be9831aa948e5b7c

• Linux · Linux

  • affected 2.6.39
  • unaffected < 2.6.39
  • unaffected 4.14.324 – ≤ 4.14.*
  • unaffected 4.19.293 – ≤ 4.19.*
  • unaffected 5.4.255 – ≤ 5.4.*
  • unaffected 5.10.192 – ≤ 5.10.*
  • unaffected 5.15.128 – ≤ 5.15.*
  • unaffected 6.1.47 – ≤ 6.1.*
  • unaffected 6.4.12 – ≤ 6.4.*
  • unaffected 6.5 – ≤ *

References (8)

• https://git.kernel.org/stable/c/ed1cba039309c80b49719fcff3e3d7cdddb73d96 (opens in a new tab)
• https://git.kernel.org/stable/c/44f69c96f8a147413c23c68cda4d6fb5e23137cd (opens in a new tab)
• https://git.kernel.org/stable/c/8046beb890ebc83c5820188c650073e1c6066e67 (opens in a new tab)
• https://git.kernel.org/stable/c/bd30aa9c7febb6e709670cd5154194189ca3b7b5 (opens in a new tab)
• https://git.kernel.org/stable/c/075448a2eb753f813fe873cfa52853e9fef8eedb (opens in a new tab)
• https://git.kernel.org/stable/c/87b655f4936b6fc01f3658aa88a22c923b379ebd (opens in a new tab)
• https://git.kernel.org/stable/c/53df4be4f5221e90dc7aa9ce745a9a21bb7024f4 (opens in a new tab)
• https://git.kernel.org/stable/c/00374d9b6d9f932802b55181be9831aa948e5b7c (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2023-53147](https://trackcve.app/badge/CVE-2023-53147.svg)](https://trackcve.app/cve/CVE-2023-53147)

Record last updated 5 Nov 2026, 20:21 UTC.