CVE-2026-72427High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix effective prog array index with BPF_F_PREORDER replace_effective_prog() and purge_effective_progs() located the slot in the effective array by walking the pro…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix effective prog array index with BPF_F_PREORDER
replace_effective_prog() and purge_effective_progs() located the slot in the effective array by walking the program hlist and counting entries linearly. That count does not match the array layout: compute_effective_ progs() places BPF_F_PREORDER programs at the front (ancestor cgroup first, attach order within a cgroup) and the rest after them (descendant cgroup first). So when a preorder program is present, the linear hlist position no longer equals the program's index in the effective array.
For replace_effective_prog() (bpf_link_update()) this overwrote the wrong slot, corrupting the effective order. For purge_effective_progs(), it could dummy out a slot belonging to a different program and leave the detached program in the array while bpf_prog_put() drops its reference, i.e. a use-after-free.
Fix both by replaying compute_effective_progs()'s placement (including the per-cgroup preorder reversal) in a shared effective_prog_pos() helper. Identify the entry by its struct bpf_prog_list pointer rather than by (prog, link) value, so the lookup resolves to exactly the attachment the syscall selected even when the same bpf_prog is attached to several cgroups in the hierarchy.
Linux >= bc8023ef3b11410682e5d4990e05e5bc2d3e1c94 < 525e408c27ae714e538b8c608c3a974df3ab6c92Linux >= 555c0b713ca83968d3c843cb15485b9ba3367b1b < 41b4320b84fdafe1ab586b06453d30d50415db59Linux >= 4b82b181a26cff8bf7adc3a85a88d121d92edeaf < 9697db03e010391c55ae75192cbdf30c5a72c114Linux >= 4b82b181a26cff8bf7adc3a85a88d121d92edeaf < b584f107ab90222bd825dcb4c5977326ff684109Linux >= 4b82b181a26cff8bf7adc3a85a88d121d92edeaf < f08aaee3152d0dfc578b3f2586932d82062701ddLinux 4707ad649cf662add3058bff47430817811b048dLinux >= 6.6.93 < 6.6.145Linux >= 6.12.31 < 6.12.97Linux >= 6.14.9 < 6.15Linux 6.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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