AZL-73108
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-73108.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-73108
- Upstream
- Published
- 2025-12-24T13:16:29Z
- Modified
- 2026-04-01T05:22:15.910950Z
- Summary
- CVE-2025-68742 affecting package kernel for versions less than 6.6.121.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix invalid prog->stats access when updateeffectiveprogs fails
Syzkaller triggers an invalid memory access issue following fault injection in updateeffectiveprogs. The issue can be described as follows:
_cgroupbpfdetach updateeffectiveprogs computeeffectiveprogs bpfprogarrayalloc <-- fault inject purgeeffectiveprogs /* change to dummybpfprog */ array->items[index] = &dummybpfprog.prog
---softirq start--- __do_softirq ... __cgroupbpfrunfilterskb __bpfprogrunsavecb bpfprogrun stats = thiscpuptr(prog->stats) /* invalid memory access */ flags = u64statsupdatebeginirqsave(&stats->syncp) ---softirq end---
staticbranchdec(&cgroupbpfenabled_key[atype])
The reason is that fault injection caused updateeffectiveprogs to fail and then changed the original prog into dummybpfprog.prog in purgeeffectiveprogs. Then a softirq came, and accessing the members of dummybpfprog.prog in the softirq triggers invalid mem access.
To fix it, skip updating stats when stats is NULL.
- References