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gtp: serialize PDP context updates

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-80851

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-80851

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
        "lessThan": "b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
        "lessThan": "5f77ddb2756340c1b05381674ca025d52998005e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
        "lessThan": "3d950e98f74af9611925a5226edced02155f6ed1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
        "lessThan": "6df4f05bc2991467939d7d80b6f7e121559cc3df",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
        "lessThan": "1e995498d29784a06a2b2899370a1926cfc8410d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
        "lessThan": "498386b6d402737db1e2eeed4c385acbf0ef9e34",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/gtp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.108",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.49",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/gtp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-80851

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34866 · Revision 1
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