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Fencer Vulns
no cvss —

CVE-2026-90098 json

net: sparx5: fix sleep in atomic context in MAC table access

published 2026-09-17 52 d ago modified 2026-10-19 21 d ago also EUVD-2026-81959

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: sparx5: fix sleep in atomic context in MAC table access

sparx5_set_rx_mode() runs with netif_addr_lock_bh held and iterates dev->mc via __dev_mc_sync(), which per address calls sparx5_mc_sync() / sparx5_mc_unsync() -> sparx5_mact_learn() / sparx5_mact_forget(). These take sparx5->lock, a mutex, and then poll the MAC access command register with readx_poll_timeout(). A mutex may block, which is not allowed from atomic context.

Convert the driver to the new .ndo_set_rx_mode_async callback introduced in commit 3554b4345d85 ("net: introduce ndo_set_rx_mode_async and netdev_rx_mode_work"). The async callback is invoked from process context, so the mutex and sleeping completion poll can remain.

Observed with CONFIG_PROVE_LOCKING, CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_MUTEXES and CONFIG_DEBUG_ATOMIC_SLEEP enabled:

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:591 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 217, name: ip preempt_count: 201, expected: 0 Call trace: __might_resched+0x144/0x248 __might_sleep+0x48/0x7c __mutex_lock+0x74/0x850 mutex_lock_nested+0x24/0x30 sparx5_mact_learn+0x78/0x100 sparx5_mc_sync+0x40/0x54 __hw_addr_sync_dev+0xc4/0x170 sparx5_set_rx_mode+0x4c/0x58 __dev_set_rx_mode+0x64/0xa4 __dev_open+0x1ec/0x26c

Patch / fix

  • Linux Linux 7.2.6, 7.3
  • linux Debian 14 7.2.6-1

debian advisories DEBIAN-CVE-2026-90098

  • kernel-source openSUSE Tumbleweed 7.2.7-1.1

opensuse advisories openSUSE-SU-2026:11880-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-90098 updated cvss 5.5

kernel: net: sparx5: fix sleep in atomic context in MAC table access

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.