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CVE-2026-31532— can: raw: fix ro->uniq use-after-free in raw_rcv()

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在raw_rcv中ro->uniq存在释放后重用，可能导致在RCU读侧临界区访问已释放的percpu存储。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3 affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 64c8553decf5a5f2417bd54761ea0a832c56c4ca affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 3f43f12fde34737fba091b7e3ab391e14ddbb0be affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 5e9cfffad898bbeaafd0ea608a6d267362f050fc affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 572f0bf536ebc14f6e7da3d21a85cf076de8358e affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0 affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 7201a531b9a5ed892bfda5ded9194ef622de8ffa affected
514ac99c64b22d83b52dfee3b8becaa69a92bc4a< 34c1741254ff972e8375faf176678a248826fe3a affected
… +12 more rows
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I. Basic Information for CVE-2026-31532

Vulnerability Information
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Vulnerability Title
can: raw: fix ro->uniq use-after-free in raw_rcv()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu(). This leaves a window where raw_rcv() may still be running in an RCU read-side critical section after raw_release() frees ro->uniq, leading to a use-after-free of the percpu uniq storage. Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor. can_rx_unregister() takes an extra reference to the socket and only drops it from the RCU callback, so freeing uniq from sk_destruct ensures the percpu area is not released until the relevant callbacks have drained. [mkl: applied manually]
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在raw_rcv中ro->uniq存在释放后重用，可能导致在RCU读侧临界区访问已释放的percpu存储。
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 514ac99c64b22d83b52dfee3b8becaa69a92bc4a ~ 1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3 -
Linux Linux 4.1 -

II. Public POCs for CVE-2026-31532

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III. Intelligence Information for CVE-2026-31532

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Patches & Fixes for CVE-2026-31532 (4)

Same Patch Batch · Linux · 2026-04-23 · 3 CVEs total

CVE-2026-31533 9.8 CRITICAL net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption
CVE-2026-31531 ipv4: nexthop: allocate skb dynamically in rtm_get_nexthop()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31532

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