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CVE-2026-63800— pNFS: Fix use-after-free in pnfs_update_layout()

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存在安全漏洞，该漏洞源于pnfs_update_layout()函数中的释放后重用问题，可能导致在NFS_LAYOUT_RETURN分支中，tracepoint访问已释放的lo字段。

CVSS 9.8 · Critical EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 21

VendorProduct Version RangeStatus
Linux Linux 06f58dbc49a23c99e5c0f246879ed16667f7bf8f< 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 1f24b8302c77dcaf79c64c073877a3b9f4dd25d2 affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 9c0fb5c09ae5bd68dc0038692af8127029cb0385 affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 7e37e9b3e82ade881e1798e2f4fcc54aff7793c1 affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 2883ddd7542b4437a2ab4908fe2773f690e20889 affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 200e7637f4d6a1342987045eea72641524f909dc affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 9645aaf689aff57427ece3b9fa47d5b5399417f4 affected
2c8d5fc37fe2384a9bdb6965443ab9224d46f704< 13e198a90ca4050f4bee8a3f23680389a6563ccc affected
… +13 more rows
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I. Basic Information for CVE-2026-63800

Vulnerability Information
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Vulnerability Title
pNFS: Fix use-after-free in pnfs_update_layout()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfs_update_layout() When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields. Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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存在安全漏洞，该漏洞源于pnfs_update_layout()函数中的释放后重用问题，可能导致在NFS_LAYOUT_RETURN分支中，tracepoint访问已释放的lo字段。
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 06f58dbc49a23c99e5c0f246879ed16667f7bf8f ~ 4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98 -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-63800

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III. Intelligence Information for CVE-2026-63800

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Patches & Fixes for CVE-2026-63800 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64047 9.8 CRITICAL net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63800

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