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CVE-2026-74502— ALSA: ump: fix double free of out_cvts on rawmidi 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 6.5版本存在安全漏洞，该漏洞源于snd_ump_attach_legacy_rawmidi()在错误路径释放out_cvts后未清空指针，导致双重释放，可能造成内存损坏或系统崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P7

Possible ATT&CK Techniques 2 AI

T1200 · Hardware Additions T1206

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49< e84d2e53a05c78a04d1343eeb0f31a79456e79fc affected
33cd7630782df2230529c3e8f1a6d0ae9cd6ab49< 3302aaeac4f7ee6b775850db21d5f61064ce70ad affected
33cd7630782df2230529c3e8f1a6d0ae9cd6ab49< 032746c2dd9a4ea0774b04ac8a29e2ea628f106e affected
33cd7630782df2230529c3e8f1a6d0ae9cd6ab49< c57001f55f97ef856fb6527e376c5c4a056a53a4 affected
33cd7630782df2230529c3e8f1a6d0ae9cd6ab49< 70c977815af0d997feb2d0c5d284d55689bf7051 affected
6.5 affected
< 6.5 unaffected
6.6.151≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74502

Vulnerability Information
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Vulnerability Title
ALSA: ump: fix double free of out_cvts on rawmidi error
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: fix double free of out_cvts on rawmidi error snd_ump_attach_legacy_rawmidi() allocates the legacy conversion array ump->out_cvts and, on the snd_rawmidi_new() error path, frees it with kfree() but leaves ump->out_cvts pointing at the freed memory. When the endpoint is later torn down, snd_ump_endpoint_free() frees ump->out_cvts a second time, resulting in a double free. The host snd-usb-audio driver attaches the legacy rawmidi for any USB MIDI 2.0 (UMP) device, so a device that makes snd_rawmidi_new() fail reaches this path on enumeration. Clear ump->out_cvts after freeing it on the error path so it is not freed again during teardown. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 6.5版本存在安全漏洞，该漏洞源于snd_ump_attach_legacy_rawmidi()在错误路径释放out_cvts后未清空指针，导致双重释放，可能造成内存损坏或系统崩溃。
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 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 ~ e84d2e53a05c78a04d1343eeb0f31a79456e79fc -
Linux Linux 6.5 -

II. Public POCs for CVE-2026-74502

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III. Intelligence Information for CVE-2026-74502

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Patches & Fixes for CVE-2026-74502 (5)

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-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free

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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