bpf: make sure skb->len != 0 when redirecting to a tunneling device

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-50253
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-15 14:15:36 UTC
Updated2026-11-05 20:17:29 UTC
DescriptionIn 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?

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d ffbccc5fb0a67424e12f7f8da210c04c8063f797 git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d e6a63203e5a90a39392fa1a7ffc60f5e9baf642a git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d 772431f30ca040cfbf31b791d468bac6a9ca74d3 git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d 6d935a02658be82585ecb39aab339faa84496650 git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d 5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5 git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d 1b65704b8c08ae92db29f720d3b298031131da53 git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d f186303845a01cc7e991f9dc51d7e5a3cdc7aedb git Not specified
CNA Linux Linux affected 4e3264d21b90984c2165e8fe5a7b64cf25bc2c2d 07ec7b502800ba9f7b8b15cb01dd6556bb41aaca git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 4.14.303 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.270 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.229 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.163 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.86 5.15.* semver Not specified
CNA Linux Linux unaffected 6.0.16 6.0.* semver Not specified
CNA Linux Linux unaffected 6.1.2 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5d3f4478d22b2cb1810f6fe0f797411e9d87b3e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6d935a02658be82585ecb39aab339faa84496650 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f186303845a01cc7e991f9dc51d7e5a3cdc7aedb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e6a63203e5a90a39392fa1a7ffc60f5e9baf642a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1b65704b8c08ae92db29f720d3b298031131da53 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/07ec7b502800ba9f7b8b15cb01dd6556bb41aaca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/772431f30ca040cfbf31b791d468bac6a9ca74d3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ffbccc5fb0a67424e12f7f8da210c04c8063f797 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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