Unknown

CVE-2026-89780 — 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:739) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt

Published Sep 16, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 11% of scored CVEs · Oct 20, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < 5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < 9b78ab84ddf97c06a8567edb62b6c0fd582f9a62≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < 9d18c6c6cd1666b2cb7915cad052e22abf520997≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < 4bcef54e4a3355a62d9ad90729fe563435ec76c3≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < b14c22c31d9e30f38ea1693ac06d318f32258f5d≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < 7abe769e72c792e5f9eb273813eb3ecd8389854c≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < 200460a0793dc6af97d3b36d92ac245350ac26fc≥ 378e25357ac78ad02fbc98bec9b4e3baaa916c5c and < a66734a1c5e36525ea07e9f4547fddc51e916de3 and 1 more version 4.17	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 20, 2026 · 5 reading(s) · max 0.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

10 on the record

git.kernel.org/stable/c/9b78ab84ddf97c06a8567edb62b6c0fd582f9a62
NIST National Vulnerability Database
git.kernel.org/stable/c/9d18c6c6cd1666b2cb7915cad052e22abf520997
NIST National Vulnerability Database
git.kernel.org/stable/c/4bcef54e4a3355a62d9ad90729fe563435ec76c3
NIST National Vulnerability Database
github.com/advisories/GHSA-2f6m-7f8f-p7hp
GitHub Security Advisories
nvd.nist.gov/vuln/detail/CVE-2026-89780
GitHub Security Advisories
git.kernel.org/stable/c/5aaa7409c1b4ca4c60d66e2afa99703bf4eb7ddd
NIST National Vulnerability Database
git.kernel.org/stable/c/b14c22c31d9e30f38ea1693ac06d318f32258f5d
NIST National Vulnerability Database
git.kernel.org/stable/c/200460a0793dc6af97d3b36d92ac245350ac26fc
NIST National Vulnerability Database
git.kernel.org/stable/c/7abe769e72c792e5f9eb273813eb3ecd8389854c
NIST National Vulnerability Database
git.kernel.org/stable/c/a66734a1c5e36525ea07e9f4547fddc51e916de3
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98869 bpf: Infer zext_dst based on static register liveness analysis 1h
Unknown CVE-2023-7356 Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID 1h
Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 3d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 3d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 3d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89780 is "net: qualcomm: rmnet: restore skb->dev on deaggregated frames", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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