{"id":"CVE-2026-98589","published":"2026-10-18T16:17:11.513","lastModified":"2026-10-19T10:19:19.933","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject pkt arguments in mutating subprogs\n\nThe verifier tracks changes in how PTR_TO_PACKET registers'\nbounds are modified across subprog boundaries. PTR_TO_PACKET\nregisters are actually passed as PTR_TO_MEM, which is assumed\nvalid for the entire call. This is not the case with packet memory,\nwhere a pskb_* call may invalidate its memory region.\n\nReject BPF code that passes PTR_TO_PACKET pointers to subprogs that\nmay mutate a packet. We cannot pass the pointer as a true PTR_TO_PACKET\nbecause we would also need to somehow pass the PTR_TO_PACKET_META\nor PTR_TO_PACKET_END to the subprog. Since we cannot avoid representing\nthe pointer in the subprog as PTR_TO_MEM, only permit it if the\nsubprog is guaranteed not to mutate the packet.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea","tags":[]},{"url":"https://git.kernel.org/stable/c/a6c1edfbe240e4377038a0e1d233ad81fde9a21b","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}