gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free
In the Linux kernel, the following vulnerability has been resolved: gtp: add synchronize_net() in gtp_newlink() error path to prevent use-after-free gtp_newlink()'s error path frees tid_hash and addr_hash without waiting for an RCU grace period after clearing sk_user_data. A concurrent gtp_encap_recv() in softirq may still hold the gtp_dev pointer obtained via rcu_dereference_sk_user_data() and access the freed memory. BUG: KASAN: slab-use-after-free in gtp0_pdp_find+0x1f6/0x200 (gtp.c:152) Call Trace: gtp0_pdp_find+0x1f6/0x200 gtp_encap_recv+0x527/0x24b0 udp_queue_rcv_one_skb+0x75f/0xc10 Add synchronize_net() before the kfree calls in out_hashtable, which covers all error paths from both gtp_encap_enable() and gtp_create_sockets().
CVE-2026-89789
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-2026-89789
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": "fcafb2b1430824bae4258c01a439ec97ca0c6973",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "3ca3da5c305caa873ddb81e8c6b118143f6dd3d1",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "6f815c2fb6ab20385f81c353cdad0ea3b88132af",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "e3b9aa0773abd5d4ed90be41ce5306c146d5b09e",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "fd8396cfecbd904468c71362f08aaa25f96d5337",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "7677eb2cbf2cc7446de474c01a6b06277c0051e5",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "8d85498016a5bb56339734a14c276209fa65bafc",
"versionType": "git"
},
{
"status": "affected",
"version": "459aa660eb1d8ce67080da1983bb81d716aa5a69",
"lessThan": "d989e22ae9802c52c56ad4284d0caf26696cf6ae",
"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": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"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-2026-89789
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36259 · Revision 1
- Added to Heist Feed
- Publisher date