bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90313
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:29 UTC
Updated2026-09-17 17:17:29 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed A potential invalid storage access issue can occur after replacing a cgroup bpf prog. This occurs in the following scenario: 1. prog1 with storage is attached to a cgroup in multi-attach mode. 2. prog1 is replaced with prog2 using BPF_F_REPLACE in multi-attach mode, but fails midway (e.g. in bpf_trampoline_link_cgroup_shim or update_effective_progs). 3. A new prog3 is attached to the cgroup in multi-attach mode. The reason is that __cgroup_bpf_attach overwrites pl->storage with the new storage prior to attachment completion. When attachment fails midway, the cleanup path calls bpf_cgroup_storages_free(new_storage) to free the newly allocated storage, but fails to restore pl->storage back to old_storage. Consequently, the still-active prog1 holds invalid or dangling storage pointers, leading to an invalid memory access when prog1 executes and calls bpf_get_local_storage. Additionally, original pl->flags and cgrp->bpf.flags[atype] are left unrestored. Fix this by saving old_pl_flags, old_storage, and old_flags prior to the update, and properly restoring all of them in the cleanup path on error.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 e26db0d636e4c24a6b16683ea95cf5077c64d74b git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 aaca16e042527f7efe48b50799bc662f1a191ce1 git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 86ead176301109b78e1d14c0e9d0d9ff9723c769 git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 2c2218560b6e28a63ff7834ba26d09ff8efdee39 git Not specified
CNA Linux Linux affected 7d9c3427894fe70d1347b4820476bf37736d2ff0 6655c409707ec8ce9ce0850ffe4fe02331fd4d9c git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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