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CVE-2026-89961— powerpc/mm: fix wrong addr_pfn tracking in compound vmemmap population

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： powerpc/mm：修复复合页 vmemmap 填充过程中 addr_pfn 追踪错误的问题 函数使用 来确定复合页内部的 PFN 偏移量，并据此判断当前 vmemmap 槽位应填充为头页（head page）映射，还是应复用尾页（tail page）映射。 然而， 是与 并行地手动递增的。由于循环本身在 vmemmap 地址空间中推进， 每步推进一个 ，实际上覆盖 个 槽位。由于 是以数据 PFN 为单位与 进行比较的，其增量应与上述 PFN 数量一致。现有的手动增

CVSS 7.8 · High EPSS 0.18% · P6

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux f2b79c0d79683d552369bb9a7282c1f0226fc566< b96be860673f9fbbf12cdadb0b25fc4d6d4d207f affected
f2b79c0d79683d552369bb9a7282c1f0226fc566< e163c7184acf36ac20a248498f4a16016057ca01 affected
f2b79c0d79683d552369bb9a7282c1f0226fc566< 9c914b7a0bd18834505c65f22225ce22c152b2d9 affected
f2b79c0d79683d552369bb9a7282c1f0226fc566< 7968852a7ca3ce81477ec5b4494a28d612f35a97 affected
f2b79c0d79683d552369bb9a7282c1f0226fc566< 89a4ae32764172468dea303eb6ae90fe6c859712 affected
6.6 affected
< 6.6 unaffected
6.6.157≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-89961

Vulnerability Information
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Vulnerability Title
powerpc/mm: fix wrong addr_pfn tracking in compound vmemmap population
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/mm: fix wrong addr_pfn tracking in compound vmemmap population vmemmap_populate_compound_pages() uses addr_pfn to determine the PFN offset within a compound page and to decide whether the current vmemmap slot should be populated as a head page mapping or should reuse a tail page mapping. However, addr_pfn is advanced manually in parallel with addr. The loop itself progresses in vmemmap address space, so each PAGE_SIZE step in addr covers PAGE_SIZE / sizeof(struct page) struct page slots. Since addr_pfn is compared against nr_pages in data-PFN units, it should advance by the same number of PFNs. The existing manual increments do not match that and therefore do not reliably track the PFN corresponding to the current addr. As a result, pfn_offset can be computed from the wrong PFN and the code can make the head/tail decision for the wrong compound-page position. Fix this by deriving addr_pfn directly from the current vmemmap address instead of carrying it as loop state.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f2b79c0d79683d552369bb9a7282c1f0226fc566 ~ b96be860673f9fbbf12cdadb0b25fc4d6d4d207f -
Linux Linux 6.6 -

II. Public POCs for CVE-2026-89961

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III. Intelligence Information for CVE-2026-89961

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Other References for CVE-2026-89961 (5)

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

V. Comments for CVE-2026-89961

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