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CVE-2026-97923— tracing: Free histogram the var ref when its initialization fails

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： tracing：在变量引用初始化失败时释放直方图变量引用 create_var_ref() 函数分配了一个 VAR_REF 类型的 hist_field，随后调用 init_var_ref() 对其进行填充。当 init_var_ref() 失败时，该字段会发生内存泄漏。 提交 656fe2ba85e8（“tracing: 使用 hist trigger 的 var_ref 数组来销毁 var_refs”）修改了 destroy_hist_field()，使其对 HIS

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 608b7751926ec08fae6a1ac4e7308195da68c362 affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 4870f9071c9ea3c1423a07741b85a794db30d672 affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 352f84a381e7b4651b30366e93cb858f3fa9c91a affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 4924328d6991f25b65bb7c8ff5d56c2a9b254851 affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 74375caa20fe5165807b4334c783d1790b01f02a affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 222abcbe7866fef04563b6eb89fb21f627dcbc77 affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< a69baeac38677270656e85753d93856a076dee57 affected
656fe2ba85e81d00e4447bf77b8da2be3c47acb2< 516001d53e6b2ea95a251ee2ef54a1a689a3fd58 affected
… +12 more rows
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I. Basic Information for CVE-2026-97923

Vulnerability Information
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Vulnerability Title
tracing: Free histogram the var ref when its initialization fails
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Free histogram the var ref when its initialization fails create_var_ref() allocates a VAR_REF hist_field and then calls init_var_ref() to fill it in. When that fails the field is leaked. commit 656fe2ba85e8 ("tracing: Use hist trigger's var_ref array to destroy var_refs") made destroy_hist_field() return early for HIST_FIELD_FL_VAR_REF, since var refs are freed by walking the trigger's var_refs[] array instead. create_var_ref() adds the field to that array only after init_var_ref() has succeeded, so on this path the field is in neither place and nothing frees it. The call was correct when it was written, before var refs were taken out of destroy_hist_field(). init_var_ref() cannot free it either. The caller owns the field, so init_var_ref() undoes only its own string allocations and leaves the field alone. Freeing it there would leave create_var_ref() passing freed memory to destroy_hist_field(), which reads its flags. Call __destroy_hist_field(), which frees the field without consulting the flag.
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 656fe2ba85e81d00e4447bf77b8da2be3c47acb2 ~ 608b7751926ec08fae6a1ac4e7308195da68c362 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-97923

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III. Intelligence Information for CVE-2026-97923

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Patches & Fixes for CVE-2026-97923 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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