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CVE-2026-64251— pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()

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基金会开源的一款操作系统内核。 Linux kernel 6.11版本存在安全漏洞，该漏洞源于pwrseq_debugfs_seq_next函数中引用计数处理不当，导致释放后重用。

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 249ebf3f65f8530beb2cbfb91bff1d83ba88d23c< ba0b9f04c7a5f9887b8ce672eaf049502c0548ec affected
249ebf3f65f8530beb2cbfb91bff1d83ba88d23c< e91df6d273445c03f5aa302bfe147eda33d45794 affected
249ebf3f65f8530beb2cbfb91bff1d83ba88d23c< 73569a44fca2992f0ca4a4c0104069741b9873a0 affected
249ebf3f65f8530beb2cbfb91bff1d83ba88d23c< 257595adf9dac15ae1edd9d07753fbc576a7583d affected
6.11 affected
< 6.11 unaffected
6.12.95≤ 6.12.* unaffected
6.18.38≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-64251

Vulnerability Information
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Vulnerability Title
pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pwrseq: core: fix use-after-free in pwrseq_debugfs_seq_next() pwrseq_debugfs_seq_next() declares 'next' with __free(put_device), which causes put_device() to be called on the returned pointer when the variable goes out of scope. This results in a use-after-free since the seq_file framework receives a pointer whose reference has already been dropped. Simply removing __free(put_device) would fix the UAF but would leak the reference acquired by bus_find_next_device(), as stop() only calls up_read(&pwrseq_sem) and never releases the device reference. Fix this by making the reference counting consistent across all seq_file callbacks, matching the standard pattern used by PCI and SCSI: - start(): use get_device() so it returns a referenced pointer. - next(): explicitly put_device(curr) to release the previous device's reference (no NULL check needed - the seq_file framework only calls next() while the previous return was non-NULL). - stop(): put_device(data) to release the last iterated device's reference, with a NULL guard since stop() may be called with NULL when start() returned NULL or next() reached end-of-sequence.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.11版本存在安全漏洞，该漏洞源于pwrseq_debugfs_seq_next函数中引用计数处理不当，导致释放后重用。
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 249ebf3f65f8530beb2cbfb91bff1d83ba88d23c ~ ba0b9f04c7a5f9887b8ce672eaf049502c0548ec -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-64251

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III. Intelligence Information for CVE-2026-64251

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Patches & Fixes for CVE-2026-64251 (4)

Same Patch Batch · Linux · 2026-07-24 · 48 CVEs total

CVE-2026-64232 9.8 CRITICAL block: recompute nr_integrity_segments in blk_insert_cloned_request
CVE-2026-64216 9.8 CRITICAL netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()
CVE-2026-64255 8.8 HIGH wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers
CVE-2026-64247 8.4 HIGH KVM: x86: hyper-v: Bound the bank index when querying sparse banks
CVE-2026-64223 8.1 HIGH wifi: mac80211: consume only present negotiated TTLM maps
CVE-2026-64235 8.1 HIGH x86/ftrace: Relocate %rip-relative percpu refs in dynamic trampolines
CVE-2026-64218 7.8 HIGH batman-adv: bla: fix report_work leak on backbone_gw purge
CVE-2026-64226 7.8 HIGH sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path
CVE-2026-64221 7.8 HIGH spi: ti-qspi: fix use-after-free after DMA setup failure
CVE-2026-64217 7.8 HIGH netfs: Fix overrun check in netfs_extract_user_iter()
CVE-2026-64208 7.5 HIGH crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
CVE-2026-64210 7.5 HIGH net/mlx5e: xsk: Fix unlocked writing to ICOSQ
CVE-2026-64243 7.1 HIGH ASoC: codecs: simple-mux: Fix enum control bounds check
CVE-2026-64222 7.0 HIGH octeontx2-pf: avoid double free of pool->stack on AQ init failure
CVE-2026-64219 7.0 HIGH drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_as
CVE-2026-64211 srcu: Don't queue workqueue handlers to never-online CPUs
CVE-2026-64225 octeontx2-af: CGX: add bounds check to cgx_speed_mbps index
CVE-2026-64212 wifi: iwlwifi: mld: don't dereference a pointer before NULL checking it
CVE-2026-64224 octeontx2-pf: fix double free in rvu_rep_rsrc_init()
CVE-2026-64209 phy: qcom: qmp-usbc: Fix out-of-bounds array access in dp swing config

Showing top 20 of 48 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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Same vendor: Linux

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