bpf: Fix invalid prog->stats access when update_effective_progs fails

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Summary

CVECVE-2025-68742
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-24 13:16:29 UTC
Updated2026-07-14 13:17:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix invalid prog->stats access when update_effective_progs fails Syzkaller triggers an invalid memory access issue following fault injection in update_effective_progs. The issue can be described as follows: __cgroup_bpf_detach update_effective_progs compute_effective_progs bpf_prog_array_alloc <-- fault inject purge_effective_progs /* change to dummy_bpf_prog */ array->items[index] = &dummy_bpf_prog.prog ---softirq start--- __do_softirq ... __cgroup_bpf_run_filter_skb __bpf_prog_run_save_cb bpf_prog_run stats = this_cpu_ptr(prog->stats) /* invalid memory access */ flags = u64_stats_update_begin_irqsave(&stats->syncp) ---softirq end--- static_branch_dec(&cgroup_bpf_enabled_key[atype]) The reason is that fault injection caused update_effective_progs to fail and then changed the original prog into dummy_bpf_prog.prog in purge_effective_progs. Then a softirq came, and accessing the members of dummy_bpf_prog.prog in the softirq triggers invalid mem access. To fix it, skip updating stats when stats is NULL.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.086700000 (date 2026-07-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 492ecee892c2a4ba6a14903d5d586ff750b7e805 93d1964773ff513c9bd530f7686d3e48b786fa6b git Not specified
CNA Linux Linux affected 492ecee892c2a4ba6a14903d5d586ff750b7e805 bf2c990b012100610c0f1ec5c4ea434da2d080c2 git Not specified
CNA Linux Linux affected 492ecee892c2a4ba6a14903d5d586ff750b7e805 539137e3038ce6f953efd72110110f03c14c7d97 git Not specified
CNA Linux Linux affected 492ecee892c2a4ba6a14903d5d586ff750b7e805 56905bb70c8b88421709bb4e32fcba617aa37d41 git Not specified
CNA Linux Linux affected 492ecee892c2a4ba6a14903d5d586ff750b7e805 2579c356ccd35d06238b176e4b460978186d804b git Not specified
CNA Linux Linux affected 492ecee892c2a4ba6a14903d5d586ff750b7e805 7dc211c1159d991db609bdf4b0fb9033c04adcbc git Not specified
CNA Linux Linux affected 5.1 Not specified
CNA Linux Linux unaffected 5.1 semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.120 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.63 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.13 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18.2 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/56905bb70c8b88421709bb4e32fcba617aa37d41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/539137e3038ce6f953efd72110110f03c14c7d97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2579c356ccd35d06238b176e4b460978186d804b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/bf2c990b012100610c0f1ec5c4ea434da2d080c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93d1964773ff513c9bd530f7686d3e48b786fa6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7dc211c1159d991db609bdf4b0fb9033c04adcbc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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