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CVE-2024-26870 is a Linux kernel NFSv4.2 flaw in nfs4_listxattr() caused by improper handling of a caller-supplied nonzero extended-attribute buffer size. When earlier xattr enumeration consumes the entire supplied buffer and a subsequent NFSv4 user-label enumeration is invoked with zero remaining space, the function can return a total length greater than the original buffer size rather than returning ERANGE. The oversized result reaches the listxattr user-copy path and triggers a hardened usercopy kernel BUG at mm/usercopy.c:102. The fix verifies that, for a nonzero supplied size, a result larger than that size is rejected with ERANGE.
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Linux kernel NFSv4.2 flaw that can trigger a kernel BUG in nfs4_listxattr.
A Linux kernel NFSv4.2 flaw that can trigger a kernel BUG in nfs4_listxattr at mm/usercopy.c:102.
Linux kernel NFSv4.2 flaw that can trigger a kernel BUG in mm/usercopy.c during nfs4_listxattr processing.
Linux kernel NFSv4.2 flaw that can trigger a kernel BUG in nfs4_listxattr at mm/usercopy.c:102.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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