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CVE-2026-99177— KVM: SEV: Fix page dirtying in sev_gmem_post_populate()

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： KVM: SEV: 修复 sev_gmem_post_populate() 中的页面脏标记问题 set_page_dirty() 要求调用者必须持有某种锁，以确保页面的映射不会在并发过程中消失。然而，通过 get_user_pages_fast() 获取的随机页面并不满足这一条件，因此应改用 set_page_dirty_lock()。 [sean: 标记为需要回溯到稳定版本]

AI Predicted 7.8 Difficulty: Hard Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Linux	Linux	`97cd21d57e9bd2da79845178d9250cfd19289cd4< 184382f9852d433af21de96c334ecf43b8414ed8`	affected
		`97cd21d57e9bd2da79845178d9250cfd19289cd4< 97818b2fa7082e940ddd36dab12a68615300e798`	affected
		`7.2`	affected
		`< 7.2`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

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Vulnerability Information

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Vulnerability Title

KVM: SEV: Fix page dirtying in sev_gmem_post_populate()

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Fix page dirtying in sev_gmem_post_populate() set_page_dirty() requires that the caller holds some kind of lock to ensure that the page's mapping does not concurrently go away. That is not the case for a random page we got from get_user_pages_fast(), so use set_page_dirty_lock(). [sean: tag for stable]

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	97cd21d57e9bd2da79845178d9250cfd19289cd4 ~ 184382f9852d433af21de96c334ecf43b8414ed8	-
Linux	Linux	7.2	-

II. Public POCs for CVE-2026-99177

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99177

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Patches & Fixes for CVE-2026-99177 (2)

https://www.cve.org/CVERecord?id=CVE-2026-99177

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99143		tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129		selinux: fix BPF token permission checks
CVE-2026-99130		io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131		xfs: fix capability check in xfs
CVE-2026-99133		net/iucv: fix the recvmsg window update
CVE-2026-99132		xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134		mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135		dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137		cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136		dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140		tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141		tracing: Fix crash in print_graph_function_event()
CVE-2026-99142		tracing: Check operator stack capacity before pushing
CVE-2026-99154		scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151		drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
CVE-2026-99153		scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152		scsi: libiscsi: Validate the task named by a management response
CVE-2026-99150		drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Showing top 20 of 117 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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