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CVE-2026-23147— btrfs: zlib: fix the folio leak on S390 hardware acceleration

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于S390硬件加速路径未释放页面缓存中的folio，可能导致内存泄漏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.13% · P2

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux aa60fe12b4f49f49fc73e5023f8675e2df1f7805< e80617a5e1c246da2f112a1a072cdd535046adfe affected
aa60fe12b4f49f49fc73e5023f8675e2df1f7805< 0d0f1314e8f86f5205f71f9e31e272a1d008e40b affected
6.15 affected
< 6.15 unaffected
6.18.9≤ 6.18.* unaffected
6.19≤ * unaffected
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I. Basic Information for CVE-2026-23147

Vulnerability Information
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Vulnerability Title
btrfs: zlib: fix the folio leak on S390 hardware acceleration
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: zlib: fix the folio leak on S390 hardware acceleration [BUG] After commit aa60fe12b4f4 ("btrfs: zlib: refactor S390x HW acceleration buffer preparation"), we no longer release the folio of the page cache of folio returned by btrfs_compress_filemap_get_folio() for S390 hardware acceleration path. [CAUSE] Before that commit, we call kumap_local() and folio_put() after handling each folio. Although the timing is not ideal (it release previous folio at the beginning of the loop, and rely on some extra cleanup out of the loop), it at least handles the folio release correctly. Meanwhile the refactored code is easier to read, it lacks the call to release the filemap folio. [FIX] Add the missing folio_put() for copy_data_into_buffer().
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于S390硬件加速路径未释放页面缓存中的folio，可能导致内存泄漏。
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 aa60fe12b4f49f49fc73e5023f8675e2df1f7805 ~ e80617a5e1c246da2f112a1a072cdd535046adfe -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-23147

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III. Intelligence Information for CVE-2026-23147

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Same Patch Batch · Linux · 2026-02-14 · 108 CVEs total

CVE-2025-71202 8.8 HIGH iommu/sva: invalidate stale IOTLB entries for kernel address space
CVE-2026-23193 8.8 HIGH scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()
CVE-2026-23172 8.4 HIGH net: wwan: t7xx: fix potential skb->frags overflow in RX path
CVE-2026-23209 7.8 HIGH macvlan: fix error recovery in macvlan_common_newlink()
CVE-2025-71221 7.8 HIGH dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue()
CVE-2026-23178 7.8 HIGH HID: i2c-hid: fix potential buffer overflow in i2c_hid_get_report()
CVE-2026-23184 7.8 HIGH binder: fix UAF in binder_netlink_report()
CVE-2026-23185 7.8 HIGH wifi: iwlwifi: mld: cancel mlo_scan_start_wk
CVE-2026-23171 7.8 HIGH bonding: fix use-after-free due to enslave fail after slave array update
CVE-2026-23169 7.8 HIGH mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()
CVE-2026-23191 7.8 HIGH ALSA: aloop: Fix racy access at PCM trigger
CVE-2026-23192 7.8 HIGH linkwatch: use __dev_put() in callers to prevent UAF
CVE-2026-23198 7.8 HIGH KVM: Don't clobber irqfd routing type when deassigning irqfd
CVE-2026-23136 7.5 HIGH libceph: reset sparse-read state in osd_fault()
CVE-2026-23148 7.5 HIGH nvmet: fix race in nvmet_bio_done() leading to NULL pointer dereference
CVE-2026-23139 7.5 HIGH netfilter: nf_conncount: update last_gc only when GC has been performed
CVE-2025-71204 7.5 HIGH smb/server: fix refcount leak in parse_durable_handle_context()
CVE-2026-23161 7.3 HIGH mm/shmem, swap: fix race of truncate and swap entry split
CVE-2026-23204 7.1 HIGH net/sched: cls_u32: use skb_header_pointer_careful()
CVE-2025-71201 7.1 HIGH netfs: Fix early read unlock of page with EOF in middle

Showing top 20 of 108 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23147

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