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CVE-2026-45964— SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path

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，该漏洞源于在gss_alloc_msg错误路径中未释放gss_auth引用，可能导致kref泄漏。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1003 · OS Credential Dumping

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< 3b2b6c42070ce4204936288253baf101e995c2d3 affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< b559be2ec6cdb2e9c2c36c23fbbd4690d8a5c3f7 affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< a1bc9561b617ec7e2d09e6c134d1db8fcf9ca4a6 affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< 655c9ba9915f05266998dbbf4b76b3c79b8a70aa affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< e464e26b2457005c87e158570498274b9f3b90c7 affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< c20f925214249bb4fc04f7e197bea142a6438af6 affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< a2d4e9a76de0b2178001214ba5de5bf94a7354aa affected
5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e< dd2fdc3504592d85e549c523b054898a036a6afe affected
… +10 more rows
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I. Basic Information for CVE-2026-45964

Vulnerability Information
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Vulnerability Title
SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: fix gss_auth kref leak in gss_alloc_msg error path Commit 5940d1cf9f42 ("SUNRPC: Rebalance a kref in auth_gss.c") added a kref_get(&gss_auth->kref) call to balance the gss_put_auth() done in gss_release_msg(), but forgot to add a corresponding kref_put() on the error path when kstrdup_const() fails. If service_name is non-NULL and kstrdup_const() fails, the function jumps to err_put_pipe_version which calls put_pipe_version() and kfree(gss_msg), but never releases the gss_auth reference. This leads to a kref leak where the gss_auth structure is never freed. Add a forward declaration for gss_free_callback() and call kref_put() in the err_put_pipe_version error path to properly release the reference taken earlier.
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，该漏洞源于在gss_alloc_msg错误路径中未释放gss_auth引用，可能导致kref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 5940d1cf9f42f67e9cc3f7df9eda39f5888d6e9e ~ 3b2b6c42070ce4204936288253baf101e995c2d3 -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-45964

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III. Intelligence Information for CVE-2026-45964

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Patches & Fixes for CVE-2026-45964 (8)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45951 7.8 HIGH bpf: Fix a potential use-after-free of BTF object
CVE-2026-45931 7.8 HIGH accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
CVE-2026-45878 7.8 HIGH drm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-45910 7.8 HIGH RDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-45959 7.8 HIGH crypto: ccp - Fix a crash due to incorrect cleanup usage of kfree
CVE-2026-45956 7.8 HIGH drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45964

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