CVE-2022-50253: In the Linux kernel, the following vulnerability has been resolved: bpf: make sure skb->len != 0 when redirecting to a tunneling device syzkaller managed to…

PriorityP420medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.15%

4.4th percentile

In the Linux kernel, the following vulnerability has been resolved: bpf: make sure skb->len != 0 when redirecting to a tunneling device syzkaller managed to trigger another case where skb->len == 0 when we enter __dev_queue_xmit: WARNING: CPU: 0 PID: 2470 at include/linux/skbuff.h:2576 skb_assert_len include/linux/skbuff.h:2576 [inline] WARNING: CPU: 0 PID: 2470 at include/linux/skbuff.h:2576 __dev_queue_xmit+0x2069/0x35e0 net/core/dev.c:4295 Call Trace: dev_queue_xmit+0x17/0x20 net/core/dev.c:4406 __bpf_tx_skb net/core/filter.c:2115 [inline] __bpf_redirect_no_mac net/core/filter.c:2140 [inline] __bpf_redirect+0x5fb/0xda0 net/core/filter.c:2163 ____bpf_clone_redirect net/core/filter.c:2447 [inline] bpf_clone_redirect+0x247/0x390 net/core/filter.c:2419 bpf_prog_48159a89cb4a9a16+0x59/0x5e bpf_dispatcher_nop_func include/linux/bpf.h:897 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:603 [inline] bpf_test_run+0x46c/0x890 net/bpf/test_run.c:402 bpf_prog_test_run_skb+0xbdc/0x14c0 net/bpf/test_run.c:1170 bpf_prog_test_run+0x345/0x3c0 kernel/bpf/syscall.c:3648 __sys_bpf+0x43a/0x6c0 kernel/bpf/syscall.c:5005 __do_sys_bpf kernel/bpf/syscall.c:5091 [inline] __se_sys_bpf kernel/bpf/syscall.c:5089 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5089 do_syscall_64+0x54/0x70 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x61/0xc6 The reproducer doesn't really reproduce outside of syzkaller environment, so I'm taking a guess here. It looks like we do generate correct ETH_HLEN-sized packet, but we redirect the packet to the tunneling device. Before we do so, we __skb_pull l2 header and arrive again at skb->len == 0. Doesn't seem like we can do anything better than having an explicit check after __skb_pull?

Affected

21 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < ffbccc5fb0a67424e12f7f8da210c04c8063f797	ffbccc5fb0a67424e12f7f8da210c04c8063f797
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < e6a63203e5a90a39392fa1a7ffc60f5e9baf642a	e6a63203e5a90a39392fa1a7ffc60f5e9baf642a
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < 772431f30ca040cfbf31b791d468bac6a9ca74d3	772431f30ca040cfbf31b791d468bac6a9ca74d3
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < 6d935a02658be82585ecb39aab339faa84496650	6d935a02658be82585ecb39aab339faa84496650
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < 5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5	5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < 1b65704b8c08ae92db29f720d3b298031131da53	1b65704b8c08ae92db29f720d3b298031131da53
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < f186303845a01cc7e991f9dc51d7e5a3cdc7aedb	f186303845a01cc7e991f9dc51d7e5a3cdc7aedb
linux	linux	>= 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d < 07ec7b502800ba9f7b8b15cb01dd6556bb41aaca	07ec7b502800ba9f7b8b15cb01dd6556bb41aaca
linux	linux_kernel	< 4.14.303	4.14.303
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 4.15 < 4.19.270	4.19.270
linux	linux_kernel	>= 4.20 < 5.4.229	5.4.229
linux	linux_kernel	>= 5.11 < 5.15.86	5.15.86
linux	linux_kernel	>= 5.16 < 6.0.16	6.0.16
linux	linux_kernel	>= 5.5 < 5.10.163	5.10.163
linux	linux_kernel	>= 6.1 < 6.1.2	6.1.2

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv5.5MEDIUM

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.