Pixar OpenUSD Sdf_PathNode Module Use-After-Free Vulnerability Leading to Potential Remote Code Execution

published 2025-09-04 last yr. modified 2025-09-04 last yr.

cvss: 9.4; version 3.1, GitHub
cisa kev: Not listed; not in CISA's catalog
epss: —; no score, EPSS covers CVEs only
public exploits: 0; none known

### Summary A Use-After-Free (UAF) vulnerability has been discovered in the Sdf_PathNode module of the Pixar OpenUSD library. This issue occurs during the deletion of the Sdf_PrimPathNode object in multi-threaded environments, where freed memory is accessed. This results in segmentation faults or bus errors, allowing attackers to potentially exploit the vulnerability for remote code execution (RCE). By using a specially crafted .usd file, an attacker could gain control of the affected system. The vulnerability has been confirmed in multiple OpenUSD tools, including sdfdump, usdtree, usdcat, and sdffilter.

### Patches

This is fixed with [commit 0d74f31](https://github.com/PixarAnimationStudios/OpenUSD/commit/0d74f31fe64310791e274e587c9926335e9db9db), with the fix available in OpenUSD 25.08 and onwards.

### Details The issue is a Use-After-Free vulnerability in the Sdf_PathNode destruction process, specifically in Sdf_PrimPathNode::~Sdf_PrimPathNode(). When multiple threads attempt to destroy or modify the same Sdf_PathNode object, a race condition can occur, causing the object to be accessed after it has been freed. This leads to segmentation faults or bus errors, as observed in the crash logs. ``` root@DESKTOP-7VTO277:/mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/asan_install/bin# ./sdffilter /mnt/c/Users/HomePc/Downloads/one.usd Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'extent' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'extent' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) AddressSanitizer:DEADLYSIGNAL Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'extent' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iris_sbdv.faceVertexCounts) ================================================================= Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexCounts' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) AddressSanitizerWarning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexCounts' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) :DEADLYSIGNAL Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Standin' to path '/HumanFemale_Group/KidThinButtonDown/Geom/LSock/Hair/Body/HeelSeam_sbdv/BrowL_HairLayer.primvars:displayColor'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexIndices' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Tongue_sbdv' to path '/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Body/Body_sbdv.points'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexIndices' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Geom' to path '/HumanFemale_Group/KidThinButtonDown/Geom/LSock/Hair/Body/HeelSeam_sbdv.faceVertexCounts'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'points' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Cornea_sbdv' to path '/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Body/Body_sbdv.primvars:skel:jointWeights'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:displayColor' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Iris_sbdv' to path '/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Body/Body_sbdv.primvars:skel:jointWeights'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'extent' to a prim path (/RShoe/Body/ShoeBody_sbdv/Geom/RShoe/Sole/Standin/Shell_sbdv.interpolateBoundary) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:geomBindTransform' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexCounts' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iris_sbdv.faceVertexCounts) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:jointIndices' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexIndices' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iris_sbdv.faceVertexCounts) ==270474==ERROR: AddressSanitizer: SEGV on unknown address 0x7f8500000008 (pc 0x7f855a574b2b bp 0x7ffcd379aa30 sp 0x7ffcd379a770 T0) Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Pupil_sbdv' to path '/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Body/Body_sbdv.primvars:skel:jointWeights'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'points' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexCounts' to a prim path (/RShoe/Body/ShoeBody_sbdv/Geom/RShoe/Sole/Standin/Shell_sbdv.interpolateBoundary) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:displayColor' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) Warning (secondary thread): in AppendChild at line 824 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Cannot append child 'Sclera_sbdv' to path '/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Body/Body_sbdv.primvars:skel:jointWeights'. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:geomBindTransform' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:jointIndices' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) ==270474==The signal is caused by a WRITE memory access. Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:jointWeights' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'points' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iris_sbdv.faceVertexCounts) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'faceVertexIndices' to a prim path (/RShoe/Body/ShoeBody_sbdv/Geom/RShoe/Sole/Standin/Shell_sbdv.interpolateBoundary) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:jointWeights' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'points' to a prim path (/RShoe/Body/ShoeBody_sbdv/Geom/RShoe/Sole/Standin/Shell_sbdv.interpolateBoundary) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'subdivisionScheme' to a prim path (/HumanFemale_Group/HumanFemaleHair.xformOpOrder) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:displayColor' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iris_sbdv.faceVertexCounts) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:displayColor' to a prim path (/RShoe/Body/ShoeBody_sbdv/Geom/RShoe/Sole/Standin/Shell_sbdv.interpolateBoundary) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'subdivisionScheme' to a prim path (/HumanFemale_Group/SocksHuman.xformOp:transform) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:geomBindTransform' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iris_sbdv.faceVertexCounts) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:jointIndices' to a prim path (/RShoe/Body/ShoeBody_sbdv/Geom/RShoe/Sole/Standin/Shell_sbdv.interpolateBoundary) Warning (secondary thread): in AppendProperty at line 921 of /mnt/c/Users/HomePc/Fuzzing/linuxTarget/usd/OpenUSD/pxr/usd/sdf/path.cpp -- Can only append a property 'primvars:skel:jointIndices' to a prim path (/HumanFemale_Group/HumanFemale{rigComplexity=faceBones}Geom/Face/Eyes/LEye/Pupil_sbdv/LEye/Iri…

Patch / fix

fixed in 1 links 1

pypi usd-core 25.8

github.com/PixarAnimationStudios/OpenUSD@0d74f31 commit

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CVSS scores

assigned by	version	score	vector
GitHub	3.1	9.4	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	usd-core	<25.8	25.8

Classification

Weakness

CWE-416 Use After Free

References

Sources

GitHub Advisory GHSA-58p5-r2f6-g2cj

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