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CVE-2026-89895— media: cobalt: Avoid freeing ALSA private data twice

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.

在 Linux 内核中，已修复以下漏洞： 媒体：cobalt：避免对 ALSA 私有数据执行双重释放 函数将 存储于 ，并安装 作为 。自此之后， 会通过 ALSA 卡片清理流程释放 。 如果在 成功之后 失败，错误退出路径 会先调用 ，随后又调用 。这导致对同一对象进行了第二次释放（双重释放）。 修复方式： 移除显式的 调用，将 的生命周期管理完全交给 ALSA 卡片机制（即由 通过 回调来释放）。 该问题是通过静态分析工具发现的，并通过手动源码审查得到确认。

AI Predicted 7.1 Difficulty: Hard EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 85756a069c55e0315ac5990806899cfb607b987f< 75bbf45e3a954e292ae26832d2df40ca2e3ee452 affected
85756a069c55e0315ac5990806899cfb607b987f< fe65028ee72a7e07e572b351891bd7a1f8917d33 affected
85756a069c55e0315ac5990806899cfb607b987f< 61dfa8ded5efc3a25d331fa9ce5cebb85531fe70 affected
85756a069c55e0315ac5990806899cfb607b987f< 42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8 affected
85756a069c55e0315ac5990806899cfb607b987f< 6cbc8a73b3464ebeccc49987b7233b6b087b8504 affected
85756a069c55e0315ac5990806899cfb607b987f< cb1218da234ea15fa14d90e2d049d686874d7aa3 affected
85756a069c55e0315ac5990806899cfb607b987f< 8c6610e230b9355cf7df5a338a0592c0f088c00b affected
85756a069c55e0315ac5990806899cfb607b987f< 3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1 affected
… +10 more rows
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I. Basic Information for CVE-2026-89895

Vulnerability Information
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Vulnerability Title
media: cobalt: Avoid freeing ALSA private data twice
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: cobalt: Avoid freeing ALSA private data twice snd_cobalt_card_create() stores cobsc in sc->private_data and installs snd_cobalt_card_private_free() as sc->private_free. From that point, snd_card_free(sc) releases cobsc through the ALSA card cleanup path. If cobalt_alsa_init() fails after snd_cobalt_card_create(), the err_exit_free path calls snd_card_free(sc) and then kfree(cobsc). That second free releases the same object again. Remove the explicit kfree(cobsc) and leave ownership with the ALSA card. This issue was found by a static analysis checker and confirmed by manual source review.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 85756a069c55e0315ac5990806899cfb607b987f ~ 75bbf45e3a954e292ae26832d2df40ca2e3ee452 -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-89895

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III. Intelligence Information for CVE-2026-89895

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Other References for CVE-2026-89895 (8)

Same Patch Batch · Linux · 2026-09-16 · 276 CVEs total

CVE-2026-90048 9.8 CRITICAL fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()
CVE-2026-90012 9.8 CRITICAL spi: Fix DMA mapping ownership on partial map failure
CVE-2026-89970 9.8 CRITICAL nvmet-auth: Synchronize timeout work during SQ teardown
CVE-2026-89857 9.8 CRITICAL scsi: qla2xxx: Hold qpair lock when sending NVMe LS reject
CVE-2026-89969 9.8 CRITICAL nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU
CVE-2026-89847 9.8 CRITICAL scsi: qla2xxx: Avoid double completion in async IOCB timeout
CVE-2026-89972 9.8 CRITICAL nvme: add missing SRCU grace period in error path
CVE-2026-89990 9.8 CRITICAL ceph: lock mutex in ceph_mds_check_access()
CVE-2026-90036 9.8 CRITICAL NFSD: Prevent client use-after-free during blocked-lock reaping
CVE-2026-90038 9.8 CRITICAL NFSD: Prevent client use-after-free during export state revocation
CVE-2026-90037 9.8 CRITICAL NFSD: Prevent client use-after-free during close_lru reaping
CVE-2026-89788 9.8 CRITICAL ksmbd: fix tree connection use-after-free in smb2_tree_connect()
CVE-2026-89783 9.8 CRITICAL xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
CVE-2026-90042 9.8 CRITICAL ceph: properly decrypt filenames in vmalloc() buffers
CVE-2026-89778 9.8 CRITICAL isofs: fix out-of-bounds page array access on empty zisofs block
CVE-2026-89915 9.3 CRITICAL KVM: arm64: Remove VM-wide VNCR mapping counter
CVE-2026-90049 9.3 CRITICAL net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy()
CVE-2026-89775 9.3 CRITICAL KVM: arm64: Handle negative S1 walk levels in VNCR TLB size evaluation
CVE-2026-89916 9.3 CRITICAL KVM: arm64: Make VNCR invalidation participate in MMU invalidation retry
CVE-2026-89930 9.3 CRITICAL KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

Showing top 20 of 276 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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