High [CVE-2026-72298] fix 32-bit integer overflow in qrtr_endpoint_post
This high-severity Red Hat Linux advisory covers CVE-2026-72298 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10.
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Summary
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.
A flaw was found in the Linux kernel's `qrtr` network component. This overflow can bypass a size validation check, leading to an out-of-bounds write and causing the kernel to crash.
This vulnerability could allow a local attacker to cause a Denial of Service (DoS). Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10.
Red Hat fixing advisory: RHSA-2026:68532, RHSA-2026:68570.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
- kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10
- kernel-0:5.14.0-687.49.1.el9_8
- RHSA-2026:68532
- RHSA-2026:68570
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-rt-0:4.18.0-553.164.1.rt7.505.el8_10, kernel-0:5.14.0-687.49.1.el9_8, RHSA-2026:68532, RHSA-2026:68570. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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