CVE-2026-72298 net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post()
A 32-bit integer overflow in the Linux kernel QRTR network module allows remote attackers to cause a kernel crash via crafted packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72298?
CVE-2026-72298 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post()
qrtr_endpoint_post() validates an incoming packet with
if (!size || len != ALIGN(size, 4) + hdrlen) goto err;
where size comes from the wire. On 32-bit, size_t is 32 bits and ALIGN(size, 4) wraps to 0 for size >= 0xfffffffd, so the check passes and skb_put_data(skb, data + hdrlen, size) writes past the hdrlen-sized skb and oopses the kernel. 64-bit is unaffected.
This is the 32-bit residual of ad9d24c9429e2 ("net: qrtr: fix OOB Read in qrtr_endpoint_post"), which fixed only the 64-bit case.
Reject any size that cannot fit the buffer before the ALIGN.
Which versions are affected by CVE-2026-72298?
How do I fix CVE-2026-72298?
Apply the vendor's patch.
Is CVE-2026-72298 being exploited?
There is no known exploitation of CVE-2026-72298 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72298, DEBIAN-CVE-2026-72298, GHSA-3c34-q5w8-c59m, UBUNTU-CVE-2026-72298.