{"id":"CVE-2026-90313","state":"PUBLISHED","title":"bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed","description":"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->storage 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->storage 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->flags and\ncgrp->bpf.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.","publishedAt":"2026-09-17T16:08:32.932Z","updatedAt":"2026-10-30T12:35:08.910Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"217b257d2c39e8dc32d691e8952f3cd921a80233","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"e26db0d636e4c24a6b16683ea95cf5077c64d74b","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"aaca16e042527f7efe48b50799bc662f1a191ce1","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"86ead176301109b78e1d14c0e9d0d9ff9723c769","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"2c2218560b6e28a63ff7834ba26d09ff8efdee39","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"6655c409707ec8ce9ce0850ffe4fe02331fd4d9c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]}],"references":["https://git.kernel.org/stable/c/217b257d2c39e8dc32d691e8952f3cd921a80233","https://git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b","https://git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1","https://git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769","https://git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39","https://git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90313.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90313","state":"PUBLISHED","datePublished":"2026-09-17T16:08:32.932Z","dateUpdated":"2026-10-30T12:35:08.910Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.801Z"},"containers":{"cna":{"title":"bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed","descriptions":[{"lang":"en","value":"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->storage 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->storage 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->flags and\ncgrp->bpf.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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"217b257d2c39e8dc32d691e8952f3cd921a80233","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"e26db0d636e4c24a6b16683ea95cf5077c64d74b","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"aaca16e042527f7efe48b50799bc662f1a191ce1","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"86ead176301109b78e1d14c0e9d0d9ff9723c769","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"2c2218560b6e28a63ff7834ba26d09ff8efdee39","versionType":"git"},{"version":"7d9c3427894fe70d1347b4820476bf37736d2ff0","status":"affected","lessThan":"6655c409707ec8ce9ce0850ffe4fe02331fd4d9c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cgroup.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/217b257d2c39e8dc32d691e8952f3cd921a80233"},{"url":"https://git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b"},{"url":"https://git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1"},{"url":"https://git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769"},{"url":"https://git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39"},{"url":"https://git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:35:08.910Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}