CVE-2026-63800

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).

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc	Patch
https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2	Patch
https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc	Patch
https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889	Patch
https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98	Patch
https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1	Patch
https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4	Patch
https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:5.11:-::::::
	cpe:2.3:o:linux:linux_kernel:5.11:rc4::::::
	cpe:2.3:o:linux:linux_kernel:5.11:rc5::::::
	cpe:2.3:o:linux:linux_kernel:5.11:rc6::::::
	cpe:2.3:o:linux:linux_kernel:5.11:rc7::::::

History

No history.

Information

Published : 2026-07-19 12:16

Updated : 2026-08-17 05:17

NVD link : CVE-2026-63800

Mitre link : CVE-2026-63800

CVE.ORG link : CVE-2026-63800

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-416

Use After Free

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If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."}], "lastModified": "2026-08-17T05:17:16.393", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1FDC12D0-2C56-4F4C-9EBF-45DCF5316E5D", "versionEndExcluding": "5.5", "versionStartIncluding": "5.4.91"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7257F51A-BFB1-4EFF-8AB1-DEEF700EF3D5", "versionEndExcluding": "5.10.260", "versionStartIncluding": "5.10.9"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "655F31B9-4770-4EFA-8C26-7508934F4CDF", "versionEndExcluding": "5.15.211", "versionStartIncluding": "5.11.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B", "versionEndExcluding": "6.1.177", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C8AD3BC8-C843-423C-B9DB-CB52F67F578E", "versionEndExcluding": "6.6.144", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4E206B86-E0E3-4394-A93F-39F2D50A8AA8", "versionEndExcluding": "6.12.95", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA591B28-5D62-449E-BDBE-3C9391BF070A", "versionEndExcluding": "6.18.38", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E", "versionEndExcluding": "7.1.3", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7AD3510E-E8FA-47F3-9AD5-D8EA4A2719D1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A330B043-47EA-4D06-82BF-153A1735FC11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F0EE963C-B36C-4143-96A9-65BCA7D8F2EF"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B511E2F6-2917-4797-8909-8F7EA4870C7B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E9FA9D80-C790-41EA-8A21-DF7B170465E0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}