net: qualcomm: rmnet: restore skb->dev on deaggregated frames
In the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: restore skb->dev on deaggregated frames rmnet_map_deaggregate() allocates each sub-frame with alloc_skb() and leaves skb->dev NULL. __rmnet_map_ingress_handler() assigns skb->dev = ep->egress_dev only on the data path, but a MAP command frame is dispatched to rmnet_map_command() before that, so rmnet_map_send_ack() runs netif_tx_lock(skb->dev) on a NULL device. An unprivileged user reaches this by unsharing a user+net namespace, creating an rmnet link over a tap device with INGRESS_DEAGGREGATION and INGRESS_MAP_COMMANDS, and writing an aggregated frame carrying a flow-control command to the tap fd. Restore the assignment dropped by 378e25357ac7, so every skb leaving rmnet_map_deaggregate() has a valid device. BUG: KASAN: null-ptr-deref in _raw_spin_lock (kernel/locking/spinlock.c:158) Write of size 4 at addr 00000000000004b4 by task exploit/144 Call Trace: _raw_spin_lock (kernel/locking/spinlock.c:158) netif_tx_lock (net/sched/sch_generic.c:497) rmnet_map_command (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_command.c:67) rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:125) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6103) ... __netif_receive_skb_one_core (net/core/dev.c:6214) netif_receive_skb (net/core/dev.c:6474) tun_get_user (drivers/net/tun.c:1966) tun_chr_write_iter (drivers/net/tun.c:2012) vfs_write (fs/read_write.c:687) ksys_write (fs/read_write.c
CVE-2026-89780
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-2026-89780
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": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "9b78ab84ddf97c06a8567edb62b6c0fd582f9a62",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "9d18c6c6cd1666b2cb7915cad052e22abf520997",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "4bcef54e4a3355a62d9ad90729fe563435ec76c3",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "b14c22c31d9e30f38ea1693ac06d318f32258f5d",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "7abe769e72c792e5f9eb273813eb3ecd8389854c",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "200460a0793dc6af97d3b36d92ac245350ac26fc",
"versionType": "git"
},
{
"status": "affected",
"version": "378e25357ac78ad02fbc98bec9b4e3baaa916c5c",
"lessThan": "a66734a1c5e36525ea07e9f4547fddc51e916de3",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.17",
"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/ethernet/qualcomm/rmnet/rmnet_map_data.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89780
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35247 · Revision 1
- Added to Heist Feed
- Publisher date