gtp: serialize PDP context updates
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.
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
- Not stated in this record
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
- Added to Heist Feed
- Publisher date