CVE-2024-26626

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/kn —truncated—

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=2268216&gt;
• <https://bugzilla.suse.com/show_bug.cgi?id=1221089&gt;