CVE-2026-80851
UnknownSummary
In the Linux kernel, the GTP module lacks serialization of PDP context updates, which can lead to double deletion of the same PDP context when GTP_CMD_DELPDP and RTM_DELLINK operations run concurrently. This results in a general protection fault and potential use-after-free.
Risk Assessment
The organization may experience system crashes or instability in environments using GTP tunneling, potentially affecting network services.
Recommendation
Apply a Linux kernel update containing the fix that serializes gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a shared mutex.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: gtp: serialize PDP context updates PDP contexts can be deleted through GTP_CMD_DELPDP or while the GTP network device is being unregistered. The latter is serialized by RTNL, but the generic-netlink delete path only holds RCU. Running both paths concurrently can therefore make both paths delete the same PDP context. The issue was found through static analysis and reproduced on a KASAN-enabled kernel by a simple two-thread program racing GTP_CMD_DELPDP against RTM_DELLINK: Oops: general protection fault, probably for non-canonical address KASAN: maybe wild-memory-access in range [0xdead000000000120-0xdead000000000127] RIP: gtp_genl_del_pdp+0x1c1/0x420 [gtp] RBP: dead000000000122 The second deletion dereferenced the poisoned hlist pprev pointer. Serialize gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a shared mutex. Keep the mutex held until the final use of a PDP context in the NEWPDP path, and keep the RCU read-side section around the complete PDP context use in the DELPDP path.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS