geneve: Fix use-after-free in geneve_find_dev().
In the Linux kernel, the following vulnerability has been resolved: geneve: Fix use-after-free in geneve_find_dev(). syzkaller reported a use-after-free in geneve_find_dev() [0] without repro. geneve_configure() links struct geneve_dev.next to net_generic(net, geneve_net_id)->geneve_list. The net here could differ from dev_net(dev) if IFLA_NET_NS_PID, IFLA_NET_NS_FD, or IFLA_TARGET_NETNSID is set. When dev_net(dev) is dismantled, geneve_exit_batch_rtnl() finally calls unregister_netdevice_queue() for each dev in the netns, and later the dev is freed. However, its geneve_dev.next is still linked to the backend UDP socket netns. Then, use-after-free will occur when another geneve dev is created in the netns. Let's call geneve_dellink() instead in geneve_destroy_tunnels(). [0]: BUG: KASAN: slab-use-after-free in geneve_find_dev drivers/net/geneve.c:1295 [inline] BUG: KASAN: slab-use-after-free in geneve_configure+0x234/0x858 drivers/net/geneve.c:1343 Read of size 2 at addr ffff000054d6ee24 by task syz.1.4029/13441 CPU: 1 UID: 0 PID: 13441 Comm: syz.1.4029 Not tainted 6.13.0-g0ad9617c78ac #24 dc35ca22c79fb82e8e7bc5c9c9adafea898b1e3d Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x38/0x50 arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xbc/0x108 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x16c/0x6f0 mm/kasan/report.c:489 kasan_report+0xc0/0x120 mm/kasan/report.c:602 __asa
CVE-2025-21858
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-2025-21858
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": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "d5e86e27de0936f3cb0a299ce519d993e9cf3886",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "5a0538ac6826807d6919f6aecbb8996c2865af2c",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "f74f6560146714241c6e167b03165ee77a86e316",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "904e746b2e7fa952ab8801b303ce826a63153d78",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "3ce92ca990cfac88a87c61df3cc0b5880e688ecf",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "da9b0ae47f084014b1e4b3f31f70a0defd047ff3",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "788dbca056a8783ec063da3c9d49a3a71c76c283",
"versionType": "git"
},
{
"status": "affected",
"version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
"lessThan": "9593172d93b9f91c362baec4643003dc29802929",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/geneve.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.291",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.235",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.130",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.80",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.17",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.5",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/geneve.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21858
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26959 · Revision 1
- Added to Heist Feed
- Publisher date