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CVE-2026-74456— can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于peak_usb_start()函数在USB URB提交失败时对传输缓冲区进行了双重释放，可能导致内存破坏或拒绝服务。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< 914c3b8fa175acf8476ad31cf04e308638e3578e affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< 5f2fa5840c34d3a558c57855781be75e03bef752 affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< b9088d581fff971a7eb1628f8dcc30df6cfef4dc affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< 525640b93d3e5f82f4ebea4730f4e0cf799522ba affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< 4bb3325075138dd5346b71589a959878b564dc0b affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< 92d0de80ca2223b9c7da78020155b6cb27824cc0 affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< dfb17bf04a764462000f11258a7c06aa92d1f261 affected
bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d< 9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9 affected
… +10 more rows
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I. Basic Information for CVE-2026-74456

Vulnerability Information
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Vulnerability Title
can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error
Source: CVE Program / CVE List V5
Vulnerability Description
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").
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于peak_usb_start()函数在USB URB提交失败时对传输缓冲区进行了双重释放，可能导致内存破坏或拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux bb4785551f64e18b2c8bb15a3bd2b22f5ebf624d ~ 914c3b8fa175acf8476ad31cf04e308638e3578e -
Linux Linux 3.4 -

II. Public POCs for CVE-2026-74456

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III. Intelligence Information for CVE-2026-74456

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Patches & Fixes for CVE-2026-74456 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-74474 9.8 CRITICAL vxlan: use pskb_network_may_pull() for transmit path header pulls
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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