CVE-2026-72298: net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post()

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-10-16

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.

Affected products

Linux kernel: from 5.10.46 before 5.10.261; from 4.19.196 before 4.20; from 5.4.128 before 5.5; from 5.12.13 before 5.13; 5.13 — fixed in 4.20, 5.10.261, 5.13, 5.5, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.261, 5.13, 5.5. Check the vendor advisory for mitigations.

References

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