CVE-2026-23195— cgroup/dmem: avoid pool UAF
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I. Basic Information for CVE-2026-23195
Vulnerability Information
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Vulnerability Title
cgroup/dmem: avoid pool UAF
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cgroup/dmem: avoid pool UAF An UAF issue was observed: BUG: KASAN: slab-use-after-free in page_counter_uncharge+0x65/0x150 Write of size 8 at addr ffff888106715440 by task insmod/527 CPU: 4 UID: 0 PID: 527 Comm: insmod 6.19.0-rc7-next-20260129+ #11 Tainted: [O]=OOT_MODULE Call Trace: <TASK> dump_stack_lvl+0x82/0xd0 kasan_report+0xca/0x100 kasan_check_range+0x39/0x1c0 page_counter_uncharge+0x65/0x150 dmem_cgroup_uncharge+0x1f/0x260 Allocated by task 527: Freed by task 0: The buggy address belongs to the object at ffff888106715400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes inside of freed 512-byte region [ffff888106715400, ffff888106715600) The buggy address belongs to the physical page: Memory state around the buggy address: ffff888106715300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888106715380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888106715400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888106715480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888106715500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb The issue occurs because a pool can still be held by a caller after its associated memory region is unregistered. The current implementation frees the pool even if users still hold references to it (e.g., before uncharge operations complete). This patch adds a reference counter to each pool, ensuring that a pool is only freed when its reference count drops to zero.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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cgroup/dmem存在释放后重用，可能导致内存损坏。
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
II. Public POCs for CVE-2026-23195
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Same Patch Batch · Linux · 2026-02-14 · 108 CVEs total
| 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-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-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-2026-23175 | 7.0 HIGH | net: cpsw: Execute ndo_set_rx_mode callback in a work queue |
| CVE-2026-23180 | 7.0 HIGH | dpaa2-switch: add bounds check for if_id in IRQ handler |
| CVE-2025-71202 | iommu/sva: invalidate stale IOTLB entries for kernel address space | |
| CVE-2026-23137 | of: unittest: Fix memory leak in unittest_data_add() |
Showing top 20 of 108 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2026-23195
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