CVE-2026-74456
In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer. If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer. BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285 Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0 Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free issue with interrupt buffer allocation").
Affected versions
Linux kernel versions
3.4
and later are affected. Fixed in
6.6.151,
6.12.103,
6.18.44,
7.1.8,
7.2-rc6
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-74456?
CVE-2026-74456 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.4 onward and has been patched in 6.6.151, 6.12.103, 6.18.44 and others. CVE-2026-74456 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74456?
Yes. CVE-2026-74456 has been patched. Fixed versions include 6.6.151, 6.12.103, 6.18.44 and others. If you are running Linux kernel 3.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74456 actively exploited?
No. CVE-2026-74456 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.