GHSA-68F7-XQ35-M8H9
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In 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
{
"affected": [],
"aliases": [
"CVE-2026-90098"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:01Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sparx5: fix sleep in atomic context in MAC table access\n\nsparx5_set_rx_mode() runs with netif_addr_lock_bh held and iterates\ndev-\u003emc via __dev_mc_sync(), which per address calls sparx5_mc_sync() /\nsparx5_mc_unsync() -\u003e sparx5_mact_learn() / sparx5_mact_forget(). These\ntake sparx5-\u003elock, a mutex, and then poll the MAC access command\nregister with readx_poll_timeout(). A mutex may block, which is not\nallowed from atomic context.\n\nConvert the driver to the new .ndo_set_rx_mode_async callback introduced\nin commit 3554b4345d85 (\"net: introduce ndo_set_rx_mode_async and\nnetdev_rx_mode_work\"). The async callback is invoked from process\ncontext, so the mutex and sleeping completion poll can remain.\n\nObserved with CONFIG_PROVE_LOCKING, CONFIG_DEBUG_SPINLOCK,\nCONFIG_DEBUG_MUTEXES and CONFIG_DEBUG_ATOMIC_SLEEP enabled:\n\n BUG: sleeping function called from invalid context at kernel/locking/mutex.c:591\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 217, name: ip\n preempt_count: 201, expected: 0\n Call trace:\n __might_resched+0x144/0x248\n __might_sleep+0x48/0x7c\n __mutex_lock+0x74/0x850\n mutex_lock_nested+0x24/0x30\n sparx5_mact_learn+0x78/0x100\n sparx5_mc_sync+0x40/0x54\n __hw_addr_sync_dev+0xc4/0x170\n sparx5_set_rx_mode+0x4c/0x58\n __dev_set_rx_mode+0x64/0xa4\n __dev_open+0x1ec/0x26c",
"id": "GHSA-68f7-xq35-m8h9",
"modified": "2026-09-17T18:31:50Z",
"published": "2026-09-17T18:31:50Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90098"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/648d196ccc03ae3b04402ae71ffa44959a85e88f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b62793a7baeea9cf20209c9fd2e333311aaf3b8d"
}
],
"schema_version": "1.4.0",
"severity": []
}
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