Local privilege escalation via IPv6 buffer use-after-free
Published Oct 25, 2021 · Updated Aug 3, 2024
Use-after-free in the IPv6 networking component of Android kernel allows local users with System privileges to escalate privileges. When skb_realloc_headroom replaces a packet buffer, ip6_xmit assigns socket ownership after consuming the original buffer, permitting access through freed state. Exploitation requires local System execution privileges, needs no user interaction, and can corrupt kernel memory through an out-of-bounds write.
Summary
What happened
Use-after-free in the IPv6 networking component of Android kernel allows local users with System privileges to escalate privileges. When skb_realloc_headroom replaces a packet buffer, ip6_xmit assigns socket ownership after consuming the original buffer, permitting access through freed state. Exploitation requires local System execution privileges, needs no user interaction, and can corrupt kernel memory through an out-of-bounds write.
The record
- CVE
- CVE-2021-0935
- Published
- Oct 25, 2021
- Updated
- Aug 3, 2024
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- CWE-416, CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Oct 25, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=Android kernel
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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