| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-44987: ipv6: prevent UAF in ip6_send_skb() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipv6: prevent UAF in ip6_send_skb() |
| |
| syzbot reported an UAF in ip6_send_skb() [1] |
| |
| After ip6_local_out() has returned, we no longer can safely |
| dereference rt, unless we hold rcu_read_lock(). |
| |
| A similar issue has been fixed in commit |
| a688caa34beb ("ipv6: take rcu lock in rawv6_send_hdrinc()") |
| |
| Another potential issue in ip6_finish_output2() is handled in a |
| separate patch. |
| |
| [1] |
| BUG: KASAN: slab-use-after-free in ip6_send_skb+0x18d/0x230 net/ipv6/ip6_output.c:1964 |
| Read of size 8 at addr ffff88806dde4858 by task syz.1.380/6530 |
| |
| CPU: 1 UID: 0 PID: 6530 Comm: syz.1.380 Not tainted 6.11.0-rc3-syzkaller-00306-gdf6cbc62cc9b #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:93 [inline] |
| dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 |
| print_address_description mm/kasan/report.c:377 [inline] |
| print_report+0x169/0x550 mm/kasan/report.c:488 |
| kasan_report+0x143/0x180 mm/kasan/report.c:601 |
| ip6_send_skb+0x18d/0x230 net/ipv6/ip6_output.c:1964 |
| rawv6_push_pending_frames+0x75c/0x9e0 net/ipv6/raw.c:588 |
| rawv6_sendmsg+0x19c7/0x23c0 net/ipv6/raw.c:926 |
| sock_sendmsg_nosec net/socket.c:730 [inline] |
| __sock_sendmsg+0x1a6/0x270 net/socket.c:745 |
| sock_write_iter+0x2dd/0x400 net/socket.c:1160 |
| do_iter_readv_writev+0x60a/0x890 |
| vfs_writev+0x37c/0xbb0 fs/read_write.c:971 |
| do_writev+0x1b1/0x350 fs/read_write.c:1018 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| RIP: 0033:0x7f936bf79e79 |
| Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 |
| RSP: 002b:00007f936cd7f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 |
| RAX: ffffffffffffffda RBX: 00007f936c115f80 RCX: 00007f936bf79e79 |
| RDX: 0000000000000001 RSI: 0000000020000040 RDI: 0000000000000004 |
| RBP: 00007f936bfe7916 R08: 0000000000000000 R09: 0000000000000000 |
| R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 |
| R13: 0000000000000000 R14: 00007f936c115f80 R15: 00007fff2860a7a8 |
| </TASK> |
| |
| Allocated by task 6530: |
| kasan_save_stack mm/kasan/common.c:47 [inline] |
| kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 |
| unpoison_slab_object mm/kasan/common.c:312 [inline] |
| __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 |
| kasan_slab_alloc include/linux/kasan.h:201 [inline] |
| slab_post_alloc_hook mm/slub.c:3988 [inline] |
| slab_alloc_node mm/slub.c:4037 [inline] |
| kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044 |
| dst_alloc+0x12b/0x190 net/core/dst.c:89 |
| ip6_blackhole_route+0x59/0x340 net/ipv6/route.c:2670 |
| make_blackhole net/xfrm/xfrm_policy.c:3120 [inline] |
| xfrm_lookup_route+0xd1/0x1c0 net/xfrm/xfrm_policy.c:3313 |
| ip6_dst_lookup_flow+0x13e/0x180 net/ipv6/ip6_output.c:1257 |
| rawv6_sendmsg+0x1283/0x23c0 net/ipv6/raw.c:898 |
| sock_sendmsg_nosec net/socket.c:730 [inline] |
| __sock_sendmsg+0x1a6/0x270 net/socket.c:745 |
| ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597 |
| ___sys_sendmsg net/socket.c:2651 [inline] |
| __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| |
| Freed by task 45: |
| kasan_save_stack mm/kasan/common.c:47 [inline] |
| kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 |
| kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 |
| poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 |
| __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 |
| kasan_slab_free include/linux/kasan.h:184 [inline] |
| slab_free_hook mm/slub.c:2252 [inline] |
| slab_free mm/slub.c:4473 [inline] |
| kmem_cache_free+0x145/0x350 mm/slub.c:4548 |
| dst_destroy+0x2ac/0x460 net/core/dst.c:124 |
| rcu_do_batch kernel/rcu/tree.c:2569 [inline] |
| rcu_core+0xafd/0x1830 kernel/rcu/tree.c:2843 |
| handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 |
| __do_softirq kernel/softirq.c:588 [inline] |
| invoke_softirq kernel/softirq.c:428 [inline] |
| __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 |
| irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 |
| instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] |
| sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 |
| asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 |
| |
| Last potentially related work creation: |
| kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 |
| __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 |
| __call_rcu_common kernel/rcu/tree.c:3106 [inline] |
| call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210 |
| refdst_drop include/net/dst.h:263 [inline] |
| skb_dst_drop include/net/dst.h:275 [inline] |
| nf_ct_frag6_queue net/ipv6/netfilter/nf_conntrack_reasm.c:306 [inline] |
| nf_ct_frag6_gather+0xb9a/0x2080 net/ipv6/netfilter/nf_conntrack_reasm.c:485 |
| ipv6_defrag+0x2c8/0x3c0 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:67 |
| nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] |
| nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 |
| nf_hook include/linux/netfilter.h:269 [inline] |
| __ip6_local_out+0x6fa/0x800 net/ipv6/output_core.c:143 |
| ip6_local_out+0x26/0x70 net/ipv6/output_core.c:153 |
| ip6_send_skb+0x112/0x230 net/ipv6/ip6_output.c:1959 |
| rawv6_push_pending_frames+0x75c/0x9e0 net/ipv6/raw.c:588 |
| rawv6_sendmsg+0x19c7/0x23c0 net/ipv6/raw.c:926 |
| sock_sendmsg_nosec net/socket.c:730 [inline] |
| __sock_sendmsg+0x1a6/0x270 net/socket.c:745 |
| sock_write_iter+0x2dd/0x400 net/socket.c:1160 |
| do_iter_readv_writev+0x60a/0x890 |
| |
| The Linux kernel CVE team has assigned CVE-2024-44987 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 4.19.321 with commit 571567e0277008459750f0728f246086b2659429 |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 5.4.283 with commit ce2f6cfab2c637d0bd9762104023a15d0ab7c0a8 |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 5.10.225 with commit cb5880a0de12c7f618d2bdd84e2d985f1e06ed7e |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 5.15.166 with commit 24e93695b1239fbe4c31e224372be77f82dab69a |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 6.1.107 with commit 9a3e55afa95ed4ac9eda112d4f918af645d72f25 |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 6.6.48 with commit af1dde074ee2ed7dd5bdca4e7e8ba17f44e7b011 |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 6.10.7 with commit e44bd76dd072756e674f45c5be00153f4ded68b2 |
| Issue introduced in 2.6.32 with commit 0625491493d9000e4556bf566d205c28c8e7dc4e and fixed in 6.11 with commit faa389b2fbaaec7fd27a390b4896139f9da662e3 |
| |
| 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-2024-44987 |
| 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/ipv6/ip6_output.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/571567e0277008459750f0728f246086b2659429 |
| https://git.kernel.org/stable/c/ce2f6cfab2c637d0bd9762104023a15d0ab7c0a8 |
| https://git.kernel.org/stable/c/cb5880a0de12c7f618d2bdd84e2d985f1e06ed7e |
| https://git.kernel.org/stable/c/24e93695b1239fbe4c31e224372be77f82dab69a |
| https://git.kernel.org/stable/c/9a3e55afa95ed4ac9eda112d4f918af645d72f25 |
| https://git.kernel.org/stable/c/af1dde074ee2ed7dd5bdca4e7e8ba17f44e7b011 |
| https://git.kernel.org/stable/c/e44bd76dd072756e674f45c5be00153f4ded68b2 |
| https://git.kernel.org/stable/c/faa389b2fbaaec7fd27a390b4896139f9da662e3 |
