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Message-ID: <2025091551-CVE-2023-53147-8f20@gregkh> Date: Mon, 15 Sep 2025 16:02:10 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2023-53147: xfrm: add NULL check in xfrm_update_ae_params From: Greg Kroah-Hartman <gregkh@...nel.org> 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. The Linux kernel CVE team has assigned CVE-2023-53147 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 4.14.324 with commit ed1cba039309c80b49719fcff3e3d7cdddb73d96 Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 4.19.293 with commit 44f69c96f8a147413c23c68cda4d6fb5e23137cd Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 5.4.255 with commit 8046beb890ebc83c5820188c650073e1c6066e67 Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 5.10.192 with commit bd30aa9c7febb6e709670cd5154194189ca3b7b5 Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 5.15.128 with commit 075448a2eb753f813fe873cfa52853e9fef8eedb Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 6.1.47 with commit 87b655f4936b6fc01f3658aa88a22c923b379ebd Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 6.4.12 with commit 53df4be4f5221e90dc7aa9ce745a9a21bb7024f4 Issue introduced in 2.6.39 with commit d8647b79c3b7e223ac051439d165bc8e7bbb832f and fixed in 6.5 with commit 00374d9b6d9f932802b55181be9831aa948e5b7c Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2023-53147 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/xfrm/xfrm_user.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/ed1cba039309c80b49719fcff3e3d7cdddb73d96 https://git.kernel.org/stable/c/44f69c96f8a147413c23c68cda4d6fb5e23137cd https://git.kernel.org/stable/c/8046beb890ebc83c5820188c650073e1c6066e67 https://git.kernel.org/stable/c/bd30aa9c7febb6e709670cd5154194189ca3b7b5 https://git.kernel.org/stable/c/075448a2eb753f813fe873cfa52853e9fef8eedb https://git.kernel.org/stable/c/87b655f4936b6fc01f3658aa88a22c923b379ebd https://git.kernel.org/stable/c/53df4be4f5221e90dc7aa9ce745a9a21bb7024f4 https://git.kernel.org/stable/c/00374d9b6d9f932802b55181be9831aa948e5b7c
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