{"id":"CVE-2026-90250","state":"PUBLISHED","title":"bpf, cgroup: Fix storage null-ptr-deref after replacing prog","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix storage null-ptr-deref after replacing prog\n\nSyzkaller reported a storage null-ptr-deref issue after replacing prog.\nThis occurs in the following scenario:\n1. prog A, an empty prog, is attached to a cgrp.\n2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the\n   bpf_get_local_storage helper.\n3. link_update is called to replace prog A with prog B.\n\nThe reason is that __cgroup_bpf_replace fails to alloc and assign the\nrequired cgrp storage for the incoming replacement prog. Consequently,\nthe new prog inherits an uninit storage, leading to null-ptr-deref panic\nwhen kick the new prog.\n\nFix this by rejecting a link update if new_prog's cgroup storage is\nincompatible with link->prog.","publishedAt":"2026-09-17T16:07:51.403Z","updatedAt":"2026-10-30T12:34:56.117Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"16c8321ee40c420f8e02e09515a5126682ddf4ea","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"a033c950f6731be88a7da98604ed78f302f15b80","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"1ab3da12061d7ccb099f7e925fa2d865967a316a","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"12feca126831556dc7fabe5a3ba28fbd328768b6","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94","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":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","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/85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4","https://git.kernel.org/stable/c/16c8321ee40c420f8e02e09515a5126682ddf4ea","https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80","https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a","https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6","https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90250.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90250","state":"PUBLISHED","datePublished":"2026-09-17T16:07:51.403Z","dateUpdated":"2026-10-30T12:34:56.117Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.795Z"},"containers":{"cna":{"title":"bpf, cgroup: Fix storage null-ptr-deref after replacing prog","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cgroup: Fix storage null-ptr-deref after replacing prog\n\nSyzkaller reported a storage null-ptr-deref issue after replacing prog.\nThis occurs in the following scenario:\n1. prog A, an empty prog, is attached to a cgrp.\n2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the\n   bpf_get_local_storage helper.\n3. link_update is called to replace prog A with prog B.\n\nThe reason is that __cgroup_bpf_replace fails to alloc and assign the\nrequired cgrp storage for the incoming replacement prog. Consequently,\nthe new prog inherits an uninit storage, leading to null-ptr-deref panic\nwhen kick the new prog.\n\nFix this by rejecting a link update if new_prog's cgroup storage is\nincompatible with link->prog."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"16c8321ee40c420f8e02e09515a5126682ddf4ea","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"a033c950f6731be88a7da98604ed78f302f15b80","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"1ab3da12061d7ccb099f7e925fa2d865967a316a","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"12feca126831556dc7fabe5a3ba28fbd328768b6","versionType":"git"},{"version":"0c991ebc8c69d29b7fc44db17075c5aa5253e2ab","status":"affected","lessThan":"3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94","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":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","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/85785e7e2ebddcaa5c3b31bd3bcd83ae648985d4"},{"url":"https://git.kernel.org/stable/c/16c8321ee40c420f8e02e09515a5126682ddf4ea"},{"url":"https://git.kernel.org/stable/c/a033c950f6731be88a7da98604ed78f302f15b80"},{"url":"https://git.kernel.org/stable/c/1ab3da12061d7ccb099f7e925fa2d865967a316a"},{"url":"https://git.kernel.org/stable/c/12feca126831556dc7fabe5a3ba28fbd328768b6"},{"url":"https://git.kernel.org/stable/c/3f562c537e9ecf4bc5e206cfffc2cc047f1b7e94"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:34:56.117Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}