gtp: serialize PDP context updates
Summary
| CVE | CVE-2026-80851 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-04 16:18:13 UTC |
| Updated | 2026-09-04 16:18:13 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001680000 probability, percentile 0.063360000 (date 2026-09-07)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 459aa660eb1d8ce67080da1983bb81d716aa5a69 5f77ddb2756340c1b05381674ca025d52998005e git | Not specified |
| CNA | Linux | Linux | affected 459aa660eb1d8ce67080da1983bb81d716aa5a69 3d950e98f74af9611925a5226edced02155f6ed1 git | Not specified |
| CNA | Linux | Linux | affected 459aa660eb1d8ce67080da1983bb81d716aa5a69 6df4f05bc2991467939d7d80b6f7e121559cc3df git | Not specified |
| CNA | Linux | Linux | affected 459aa660eb1d8ce67080da1983bb81d716aa5a69 1e995498d29784a06a2b2899370a1926cfc8410d git | Not specified |
| CNA | Linux | Linux | affected 459aa660eb1d8ce67080da1983bb81d716aa5a69 498386b6d402737db1e2eeed4c385acbf0ef9e34 git | Not specified |
| CNA | Linux | Linux | affected 4.7 | Not specified |
| CNA | Linux | Linux | unaffected 4.7 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.108 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.49 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.13 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.3 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/6df4f05bc2991467939d7d80b6f7e121559cc3df | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1e995498d29784a06a2b2899370a1926cfc8410d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/498386b6d402737db1e2eeed4c385acbf0ef9e34 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5f77ddb2756340c1b05381674ca025d52998005e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3d950e98f74af9611925a5226edced02155f6ed1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.