| 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-2024-26626: ipmr: fix kernel panic when forwarding mcast packets |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipmr: fix kernel panic when forwarding mcast packets |
| |
| The stacktrace was: |
| [ 86.305548] BUG: kernel NULL pointer dereference, address: 0000000000000092 |
| [ 86.306815] #PF: supervisor read access in kernel mode |
| [ 86.307717] #PF: error_code(0x0000) - not-present page |
| [ 86.308624] PGD 0 P4D 0 |
| [ 86.309091] Oops: 0000 [#1] PREEMPT SMP NOPTI |
| [ 86.309883] CPU: 2 PID: 3139 Comm: pimd Tainted: G U 6.8.0-6wind-knet #1 |
| [ 86.311027] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.1-0-g0551a4be2c-prebuilt.qemu-project.org 04/01/2014 |
| [ 86.312728] RIP: 0010:ip_mr_forward (/build/work/knet/net/ipv4/ipmr.c:1985) |
| [ 86.313399] Code: f9 1f 0f 87 85 03 00 00 48 8d 04 5b 48 8d 04 83 49 8d 44 c5 00 48 8b 40 70 48 39 c2 0f 84 d9 00 00 00 49 8b 46 58 48 83 e0 fe <80> b8 92 00 00 00 00 0f 84 55 ff ff ff 49 83 47 38 01 45 85 e4 0f |
| [ 86.316565] RSP: 0018:ffffad21c0583ae0 EFLAGS: 00010246 |
| [ 86.317497] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 |
| [ 86.318596] RDX: ffff9559cb46c000 RSI: 0000000000000000 RDI: 0000000000000000 |
| [ 86.319627] RBP: ffffad21c0583b30 R08: 0000000000000000 R09: 0000000000000000 |
| [ 86.320650] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 |
| [ 86.321672] R13: ffff9559c093a000 R14: ffff9559cc00b800 R15: ffff9559c09c1d80 |
| [ 86.322873] FS: 00007f85db661980(0000) GS:ffff955a79d00000(0000) knlGS:0000000000000000 |
| [ 86.324291] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| [ 86.325314] CR2: 0000000000000092 CR3: 000000002f13a000 CR4: 0000000000350ef0 |
| [ 86.326589] Call Trace: |
| [ 86.327036] <TASK> |
| [ 86.327434] ? show_regs (/build/work/knet/arch/x86/kernel/dumpstack.c:479) |
| [ 86.328049] ? __die (/build/work/knet/arch/x86/kernel/dumpstack.c:421 /build/work/knet/arch/x86/kernel/dumpstack.c:434) |
| [ 86.328508] ? page_fault_oops (/build/work/knet/arch/x86/mm/fault.c:707) |
| [ 86.329107] ? do_user_addr_fault (/build/work/knet/arch/x86/mm/fault.c:1264) |
| [ 86.329756] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.330350] ? __irq_work_queue_local (/build/work/knet/kernel/irq_work.c:111 (discriminator 1)) |
| [ 86.331013] ? exc_page_fault (/build/work/knet/./arch/x86/include/asm/paravirt.h:693 /build/work/knet/arch/x86/mm/fault.c:1515 /build/work/knet/arch/x86/mm/fault.c:1563) |
| [ 86.331702] ? asm_exc_page_fault (/build/work/knet/./arch/x86/include/asm/idtentry.h:570) |
| [ 86.332468] ? ip_mr_forward (/build/work/knet/net/ipv4/ipmr.c:1985) |
| [ 86.333183] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.333920] ipmr_mfc_add (/build/work/knet/./include/linux/rcupdate.h:782 /build/work/knet/net/ipv4/ipmr.c:1009 /build/work/knet/net/ipv4/ipmr.c:1273) |
| [ 86.334583] ? __pfx_ipmr_hash_cmp (/build/work/knet/net/ipv4/ipmr.c:363) |
| [ 86.335357] ip_mroute_setsockopt (/build/work/knet/net/ipv4/ipmr.c:1470) |
| [ 86.336135] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.336854] ? ip_mroute_setsockopt (/build/work/knet/net/ipv4/ipmr.c:1470) |
| [ 86.337679] do_ip_setsockopt (/build/work/knet/net/ipv4/ip_sockglue.c:944) |
| [ 86.338408] ? __pfx_unix_stream_read_actor (/build/work/knet/net/unix/af_unix.c:2862) |
| [ 86.339232] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.339809] ? aa_sk_perm (/build/work/knet/security/apparmor/include/cred.h:153 /build/work/knet/security/apparmor/net.c:181) |
| [ 86.340342] ip_setsockopt (/build/work/knet/net/ipv4/ip_sockglue.c:1415) |
| [ 86.340859] raw_setsockopt (/build/work/knet/net/ipv4/raw.c:836) |
| [ 86.341408] ? security_socket_setsockopt (/build/work/knet/security/security.c:4561 (discriminator 13)) |
| [ 86.342116] sock_common_setsockopt (/build/work/knet/net/core/sock.c:3716) |
| [ 86.342747] do_sock_setsockopt (/build/work/knet/net/socket.c:2313) |
| [ 86.343363] __sys_setsockopt (/build/work/knet/./include/linux/file.h:32 /build/work/knet/net/socket.c:2336) |
| [ 86.344020] __x64_sys_setsockopt (/build/work/knet/net/socket.c:2340) |
| [ 86.344766] do_syscall_64 (/build/work/knet/arch/x86/entry/common.c:52 /build/work/knet/arch/x86/entry/common.c:83) |
| [ 86.345433] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.346161] ? syscall_exit_work (/build/work/knet/./include/linux/audit.h:357 /build/work/knet/kernel/entry/common.c:160) |
| [ 86.346938] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.347657] ? syscall_exit_to_user_mode (/build/work/knet/kernel/entry/common.c:215) |
| [ 86.348538] ? srso_return_thunk (/build/work/knet/arch/x86/lib/retpoline.S:223) |
| [ 86.349262] ? do_syscall_64 (/build/work/knet/./arch/x86/include/asm/cpufeature.h:171 /build/work/knet/arch/x86/entry/common.c:98) |
| [ 86.349971] entry_SYSCALL_64_after_hwframe (/build/work/knet/arch/x86/entry/entry_64.S:129) |
| |
| The original packet in ipmr_cache_report() may be queued and then forwarded |
| with ip_mr_forward(). This last function has the assumption that the skb |
| dst is set. |
| |
| After the below commit, the skb dst is dropped by ipv4_pktinfo_prepare(), |
| which causes the oops. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26626 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1.75 with commit f69365e3a7cab819099249c50b39f4450fdddc60 and fixed in 6.1.77 with commit d2f1b7fe74afd66298dbb3c7b39e7b62e4df1724 |
| Issue introduced in 6.6.14 with commit 7b32e63f881432bf30f282328b8e64c6aa494ba2 and fixed in 6.6.16 with commit dcaafdba6c6162bb49f1192850bc3bbc3707738c |
| Issue introduced in 6.7.2 with commit 7d97858e21fbc472acda7d908357c5fe54a8e439 and fixed in 6.7.4 with commit 2e8c9ae40adda2be1ba41c05fd3cd1e61cce3207 |
| |
| 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-2024-26626 |
| 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: |
| include/net/ip.h |
| net/ipv4/ip_sockglue.c |
| net/ipv4/ipmr.c |
| net/ipv4/raw.c |
| net/ipv4/udp.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/d2f1b7fe74afd66298dbb3c7b39e7b62e4df1724 |
| https://git.kernel.org/stable/c/dcaafdba6c6162bb49f1192850bc3bbc3707738c |
| https://git.kernel.org/stable/c/2e8c9ae40adda2be1ba41c05fd3cd1e61cce3207 |
| https://git.kernel.org/stable/c/e622502c310f1069fd9f41cd38210553115f610a |
