Kernel-memory disclosure via oversized skb tailroom copy
Published Apr 4, 2024 · Updated May 23, 2026
Uninitialized-memory exposure in the Linux netlink subsystem allows local users to read stale kernel heap data through packet sockets. In netlink_to_full_skb(), skb_put_data() uses skb->end, a buffer offset that includes uninitialized tailroom, instead of the actual payload length in skb->len. Local low-privileged access is required; the packet receive path can return those uninitialized bytes to user space, while no integrity impact is established.
Summary
What happened
Uninitialized-memory exposure in the Linux netlink subsystem allows local users to read stale kernel heap data through packet sockets. In netlink_to_full_skb(), skb_put_data() uses skb->end, a buffer offset that includes uninitialized tailroom, instead of the actual payload length in skb->len. Local low-privileged access is required; the packet receive path can return those uninitialized bytes to user space, while no integrity impact is established.
The record
- CVE
- CVE-2024-26805
- Published
- Apr 4, 2024
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-908
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 4, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <0b27bf4c494d61e5663baa34c3edd7ccebf0ea44
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <59fc3e3d049e39e7d0d271f20dd5fb47c57faf1d
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <661779e1fcafe1b74b3f3fe8e980c1e207fea1fd
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <9ae51361da43270f4ba0eb924427a07e87e48777
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <c71ed29d15b1a1ed6c464f8c3536996963046285
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <d3ada42e534a83b618bbc1e490d23bf0fdae4736
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <ec343a55b687a452f5e87f3b52bf9f155864df65
- Affected versionversion=1853c949646005b5959c483becde86608f548f24 <f19d1f98e60e68b11fc60839105dd02a30ec0d77
- Affected versionversion=3.12.49 <3.13
- Affected versionversion=3.14.54 <3.15
- Affected versionversion=3.18.23 <3.19
- Affected versionversion=4.1.10 <4.2
- Affected versionversion=4.2.3 <4.3
- Affected versionversion=4.3
- Affected versionversion=62f43b58d2b2c4f0200b9ca2b997f4c484f0272f
- Affected versionversion=65d48c630ff80a19c39751a4a6d3315f4c3c0280
- Affected versionversion=85aec6328f3346b0718211faad564a3ffa64f60e
- Affected versionversion=92994a5f49d0a81c8643452d5c0a6e8b31d85a61
- Affected versionversion=d38200098e3203ba30ba06ed3f345ec6ca75234c
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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