{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46031","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.093Z","datePublished":"2026-05-27T12:56:40.357Z","dateUpdated":"2026-06-14T17:49:15.423Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-06-14T17:49:15.423Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ks8851: Reinstate disabling of BHs around IRQ handler\n\nIf the driver executes ks8851_irq() AND a TX packet has been sent, then\nthe driver enables TX queue via netif_wake_queue() which schedules TX\nsoftirq to queue packets for this device.\n\nIf CONFIG_PREEMPT_RT=y is set AND a packet has also been received by\nthe MAC, then ks8851_rx_pkts() calls netdev_alloc_skb_ip_align() to\nallocate SKBs for the received packets. If netdev_alloc_skb_ip_align()\nis called with BH enabled, then local_bh_enable() at the end of\nnetdev_alloc_skb_ip_align() will trigger the pending softirq processing,\nwhich may ultimately call the .xmit callback ks8851_start_xmit_par().\nThe ks8851_start_xmit_par() will try to lock struct ks8851_net_par\n.lock spinlock, which is already locked by ks8851_irq() from which\nks8851_start_xmit_par() was called. This leads to a deadlock, which\nis reported by the kernel, including a trace listed below.\n\nIf CONFIG_PREEMPT_RT is not set, then since commit 0913ec336a6c0\n(\"net: ks8851: Fix deadlock with the SPI chip variant\") the deadlock\ncan also be triggered without received packet in the RX FIFO. The\npending softirqs will be processed on return from\nspin_unlock_bh(&ks->statelock) in ks8851_irq(), which triggers the\ndeadlock as well.\n\nFix the problem by disabling BH around critical sections, including the\nIRQ handler, thus preventing the net_tx_action() softirq from triggering\nduring these critical sections. The net_tx_action() softirq is triggered\nonce BH are re-enabled and at the end of the IRQ handler, once all the\nother IRQ handler actions have been completed.\n\n __schedule from schedule_rtlock+0x1c/0x34\n schedule_rtlock from rtlock_slowlock_locked+0x548/0x904\n rtlock_slowlock_locked from rt_spin_lock+0x60/0x9c\n rt_spin_lock from ks8851_start_xmit_par+0x74/0x1a8\n ks8851_start_xmit_par from netdev_start_xmit+0x20/0x44\n netdev_start_xmit from dev_hard_start_xmit+0xd0/0x188\n dev_hard_start_xmit from sch_direct_xmit+0xb8/0x25c\n sch_direct_xmit from __qdisc_run+0x1f8/0x4ec\n __qdisc_run from qdisc_run+0x1c/0x28\n qdisc_run from net_tx_action+0x1f0/0x268\n net_tx_action from handle_softirqs+0x1a4/0x270\n handle_softirqs from __local_bh_enable_ip+0xcc/0xe0\n __local_bh_enable_ip from __alloc_skb+0xd8/0x128\n __alloc_skb from __netdev_alloc_skb+0x3c/0x19c\n __netdev_alloc_skb from ks8851_irq+0x388/0x4d4\n ks8851_irq from irq_thread_fn+0x24/0x64\n irq_thread_fn from irq_thread+0x178/0x28c\n irq_thread from kthread+0x12c/0x138\n kthread from ret_from_fork+0x14/0x28"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/micrel/ks8851.h","drivers/net/ethernet/micrel/ks8851_common.c","drivers/net/ethernet/micrel/ks8851_par.c","drivers/net/ethernet/micrel/ks8851_spi.c"],"versions":[{"version":"8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545","lessThan":"1962027a6d223f90df8b372929f9d1a8d321ad6a","status":"affected","versionType":"git"},{"version":"ae87f661f3c1a3134a7ed86ab69bf9f12af88993","lessThan":"640a7631d31db87d5fa1b34cea44a99b6e78854b","status":"affected","versionType":"git"},{"version":"e0863634bf9f7cf36291ebb5bfa2d16632f79c49","lessThan":"518040324067d8efaa2da1992297b7e7bf5640f4","status":"affected","versionType":"git"},{"version":"e0863634bf9f7cf36291ebb5bfa2d16632f79c49","lessThan":"be8aad558b4675f45b43080f81a9ffdeddea73a5","status":"affected","versionType":"git"},{"version":"e0863634bf9f7cf36291ebb5bfa2d16632f79c49","lessThan":"21f1707a8e978558dcb11b053855521e32ac0eec","status":"affected","versionType":"git"},{"version":"e0863634bf9f7cf36291ebb5bfa2d16632f79c49","lessThan":"5c9fcac3c872224316714d0d8914d9af16c76a6d","status":"affected","versionType":"git"},{"version":"7e2901a2a9195da76111f351584bf77552a038f0","status":"affected","versionType":"git"},{"version":"6.1.91","lessThan":"6.1.175","status":"affected","versionType":"semver"},{"version":"6.6.31","lessThan":"6.6.140","status":"affected","versionType":"semver"},{"version":"6.8.10","lessThan":"6.9","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/micrel/ks8851.h","drivers/net/ethernet/micrel/ks8851_common.c","drivers/net/ethernet/micrel/ks8851_par.c","drivers/net/ethernet/micrel/ks8851_spi.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.1.175","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.140","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.86","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.27","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.4","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.91","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.31","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.86"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1962027a6d223f90df8b372929f9d1a8d321ad6a"},{"url":"https://git.kernel.org/stable/c/640a7631d31db87d5fa1b34cea44a99b6e78854b"},{"url":"https://git.kernel.org/stable/c/518040324067d8efaa2da1992297b7e7bf5640f4"},{"url":"https://git.kernel.org/stable/c/be8aad558b4675f45b43080f81a9ffdeddea73a5"},{"url":"https://git.kernel.org/stable/c/21f1707a8e978558dcb11b053855521e32ac0eec"},{"url":"https://git.kernel.org/stable/c/5c9fcac3c872224316714d0d8914d9af16c76a6d"}],"title":"net: ks8851: Reinstate disabling of BHs around IRQ handler","x_generator":{"engine":"bippy-1.2.0"}}}}