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CVE-2026-80851 (GCVE-0-2026-80851)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:55 – Updated: 2026-09-04 15:55
VLAI
Title
gtp: serialize PDP context updates
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 459aa660eb1d8ce67080da1983bb81d716aa5a69 , < 5f77ddb2756340c1b05381674ca025d52998005e (git)
Affected: 459aa660eb1d8ce67080da1983bb81d716aa5a69 , < 3d950e98f74af9611925a5226edced02155f6ed1 (git)
Affected: 459aa660eb1d8ce67080da1983bb81d716aa5a69 , < 6df4f05bc2991467939d7d80b6f7e121559cc3df (git)
Affected: 459aa660eb1d8ce67080da1983bb81d716aa5a69 , < 1e995498d29784a06a2b2899370a1926cfc8410d (git)
Affected: 459aa660eb1d8ce67080da1983bb81d716aa5a69 , < 498386b6d402737db1e2eeed4c385acbf0ef9e34 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: serialize PDP context updates\n\nPDP contexts can be deleted through GTP_CMD_DELPDP or while the GTP\nnetwork device is being unregistered. The latter is serialized by RTNL,\nbut the generic-netlink delete path only holds RCU.\n\nRunning both paths concurrently can therefore make both paths delete the\nsame PDP context. The issue was found through static analysis and\nreproduced on a KASAN-enabled kernel by a simple two-thread program\nracing GTP_CMD_DELPDP against RTM_DELLINK:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: maybe wild-memory-access in range\n         [0xdead000000000120-0xdead000000000127]\n  RIP: gtp_genl_del_pdp+0x1c1/0x420 [gtp]\n  RBP: dead000000000122\n\nThe second deletion dereferenced the poisoned hlist pprev pointer.\n\nSerialize gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a\nshared mutex. Keep the mutex held until the final use of a PDP context in\nthe NEWPDP path, and keep the RCU read-side section around the complete\nPDP context use in the DELPDP path."
        }
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    "dateReserved": "2026-08-26T14:34:25.797Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: serialize PDP context updates\n\nPDP contexts can be deleted through GTP_CMD_DELPDP or while the GTP\nnetwork device is being unregistered. The latter is serialized by RTNL,\nbut the generic-netlink delete path only holds RCU.\n\nRunning both paths concurrently can therefore make both paths delete the\nsame PDP context. The issue was found through static analysis and\nreproduced on a KASAN-enabled kernel by a simple two-thread program\nracing GTP_CMD_DELPDP against RTM_DELLINK:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: maybe wild-memory-access in range\n         [0xdead000000000120-0xdead000000000127]\n  RIP: gtp_genl_del_pdp+0x1c1/0x420 [gtp]\n  RBP: dead000000000122\n\nThe second deletion dereferenced the poisoned hlist pprev pointer.\n\nSerialize gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a\nshared mutex. Keep the mutex held until the final use of a PDP context in\nthe NEWPDP path, and keep the RCU read-side section around the complete\nPDP context use in the DELPDP path."
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        "metrics": {},
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      "cve": "CVE-2026-80851",
      "id": "CVE-2026-80851",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80851",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80851.json",
      "version": "4"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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