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CVE-2026-89954— mtd: afs: validate v2 image info bounds

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，以下漏洞已得到修复： mtd: afs: 验证 v2 镜像信息块的边界 AFS v2 解析器使用 footer[8] 来定位当前擦除块内部的镜像信息块，然后利用镜像信息块中的 region_count 从固定大小的本地数组中遍历各个条目。然而，页脚偏移量（footer offset）和区域数量（region count）均来源于闪存内容，在用作偏移量或遍历参数之前，并未针对擦除块范围或本地镜像信息数组进行有效性校验。 修复措施包括：拒绝那些会导致擦除块计算下溢的 v2 条目镜像信息偏移量；并

CVSS 8.0 · High EPSS 0.19% · P8

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b7cf5e2830bbb128699d7635ce8404b7f605bc95< 1bec05a68414cf8d0cab6cb42445b8603f32ffc4 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< 3ad8ff12fd44b08af9212ac4883a7e29d2ab7348 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< 875daa3c750814ff2e2dc050239c390048f0bcd0 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< da740539e8f370767317e24615349b9342a6e773 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< 1edea8900ca3e405c1421d8b5c29f97107874f72 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< 18916f475057cbd2fb8ea6ae86e6b85884ad1d53 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< d14e6298139f58a87a87d7022e26a7f37f0ddce7 affected
b7cf5e2830bbb128699d7635ce8404b7f605bc95< e9290031f736e99ad17c25c00311c92c266843b7 affected
… +10 more rows
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I. Basic Information for CVE-2026-89954

Vulnerability Information
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Vulnerability Title
mtd: afs: validate v2 image info bounds
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mtd: afs: validate v2 image info bounds The AFS v2 parser uses footer[8] to locate the image information block inside the current erase block, then uses the image information region_count to walk entries from a fixed local array. The footer offset and region count come from flash contents and are not checked against the erase block or the local image-info array before use. Reject v2 entries whose image information offset would underflow the erase block calculation, and reject region counts that cannot fit in the local image-info array before walking region entries.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
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 b7cf5e2830bbb128699d7635ce8404b7f605bc95 ~ 1bec05a68414cf8d0cab6cb42445b8603f32ffc4 -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-89954

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III. Intelligence Information for CVE-2026-89954

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Other References for CVE-2026-89954 (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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