{"id":"CVE-2026-90313","summary":"bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed\n\nA potential invalid storage access issue can occur after replacing a\ncgroup bpf prog.\n\nThis occurs in the following scenario:\n1. prog1 with storage is attached to a cgroup in multi-attach mode.\n2. prog1 is replaced with prog2 using BPF_F_REPLACE in multi-attach\n   mode, but fails midway (e.g. in bpf_trampoline_link_cgroup_shim or\n   update_effective_progs).\n3. A new prog3 is attached to the cgroup in multi-attach mode.\n\nThe reason is that __cgroup_bpf_attach overwrites pl-\u003estorage with the\nnew storage prior to attachment completion. When attachment fails\nmidway, the cleanup path calls bpf_cgroup_storages_free(new_storage) to\nfree the newly allocated storage, but fails to restore pl-\u003estorage back\nto old_storage.\n\nConsequently, the still-active prog1 holds invalid or dangling storage\npointers, leading to an invalid memory access when prog1 executes and\ncalls bpf_get_local_storage. Additionally, original pl-\u003eflags and\ncgrp-\u003ebpf.flags[atype] are left unrestored.\n\nFix this by saving old_pl_flags, old_storage, and old_flags prior to the\nupdate, and properly restoring all of them in the cleanup path on error.","modified":"2026-09-19T03:47:28.827233560Z","published":"2026-09-17T16:08:32.932Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90313.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90313.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90313"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7d9c3427894fe70d1347b4820476bf37736d2ff0"},{"fixed":"e26db0d636e4c24a6b16683ea95cf5077c64d74b"},{"fixed":"aaca16e042527f7efe48b50799bc662f1a191ce1"},{"fixed":"86ead176301109b78e1d14c0e9d0d9ff9723c769"},{"fixed":"2c2218560b6e28a63ff7834ba26d09ff8efdee39"},{"fixed":"6655c409707ec8ce9ce0850ffe4fe02331fd4d9c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90313.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90313.json"}}],"schema_version":"1.9.0"}