{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-36962","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-30T15:25:07.081Z","datePublished":"2024-06-03T07:50:00.425Z","dateUpdated":"2026-08-05T11:32:16.842Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:32:16.842Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ks8851: Queue RX packets in IRQ handler instead of disabling BHs\n\nCurrently the driver uses local_bh_disable()/local_bh_enable() in its\nIRQ handler to avoid triggering net_rx_action() softirq on exit from\nnetif_rx(). The net_rx_action() could trigger this driver .start_xmit\ncallback, which is protected by the same lock as the IRQ handler, so\ncalling the .start_xmit from netif_rx() from the IRQ handler critical\nsection protected by the lock could lead to an attempt to claim the\nalready claimed lock, and a hang.\n\nThe local_bh_disable()/local_bh_enable() approach works only in case\nthe IRQ handler is protected by a spinlock, but does not work if the\nIRQ handler is protected by mutex, i.e. this works for KS8851 with\nParallel bus interface, but not for KS8851 with SPI bus interface.\n\nRemove the BH manipulation and instead of calling netif_rx() inside\nthe IRQ handler code protected by the lock, queue all the received\nSKBs in the IRQ handler into a queue first, and once the IRQ handler\nexits the critical section protected by the lock, dequeue all the\nqueued SKBs and push them all into netif_rx(). At this point, it is\nsafe to trigger the net_rx_action() softirq, since the netif_rx()\ncall is outside of the lock that protects the IRQ handler."}],"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"},"scenarios":[{"lang":"en","value":"AV:N - `ks8851_irq()` is driven by the KS8851 MAC's interrupt, and the `IRQ_RXI` branch that exercises the sleeping SPI critical section is raised by received Ethernet frames, so a remote party sending traffic to the device (including routed, off-link traffic) triggers the vulnerable path. No local access to the embedded target is needed.\nAC:L - The defect is unconditional for the SPI-attached variant — every interrupt enters `ks8851_lock_spi()`'s `mutex_lock()` and `spi_sync()` with BHs disabled — and SPI is the original and primary attachment for this chip, so an attacker simply generating traffic reliably hits it with no race to win.\nPR:N - No authentication or privilege exists on the path; the interrupt is raised by the hardware on frame arrival, so an unauthenticated network attacker reaches the buggy handler by sending packets to the device.\nUI:N - The IRQ handler runs autonomously on packet reception; no action by any local user or administrator is required.\nS:U - The fault is contained within the kernel's own security authority — the driver's IRQ thread and softirq state — with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - The fix only moves `netif_rx()` outside the register lock by staging SKBs in an on-stack queue; there is no out-of-bounds access, use-after-free, or uninitialized data exposed, so no information is disclosed.\nI:N - No memory corruption, out-of-bounds write, or type confusion is involved — packet data and SKB handling are unchanged, so no attacker-controlled modification of kernel state is possible.\nA:H - Sleeping on a mutex and on `spi_sync()` with softirqs disabled produces a kernel BUG splat and stalls the ks8851 IRQ thread, which is exactly the hang class this patch series addresses — the interface stops servicing traffic and the system can hang."}]}],"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_common.c"],"versions":[{"version":"492337a4fbd1421b42df684ee9b34be2a2722540","lessThan":"8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545","status":"affected","versionType":"git"},{"version":"cba376eb036c2c20077b41d47b317d8218fe754f","lessThan":"ae87f661f3c1a3134a7ed86ab69bf9f12af88993","status":"affected","versionType":"git"},{"version":"49d5d70538b6b8f2a3f8f1ac30c1f921d4a0929b","lessThan":"7e2901a2a9195da76111f351584bf77552a038f0","status":"affected","versionType":"git"},{"version":"be0384bf599cf1eb8d337517feeb732d71f75a6f","lessThan":"e0863634bf9f7cf36291ebb5bfa2d16632f79c49","status":"affected","versionType":"git"}]},{"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_common.c"],"versions":[{"version":"6.1.87","lessThan":"6.1.91","status":"affected","versionType":"semver"},{"version":"6.6.28","lessThan":"6.6.31","status":"affected","versionType":"semver"},{"version":"6.8.7","lessThan":"6.8.10","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.87","versionEndExcluding":"6.1.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.28","versionEndExcluding":"6.6.31"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.7","versionEndExcluding":"6.8.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545"},{"url":"https://git.kernel.org/stable/c/ae87f661f3c1a3134a7ed86ab69bf9f12af88993"},{"url":"https://git.kernel.org/stable/c/7e2901a2a9195da76111f351584bf77552a038f0"},{"url":"https://git.kernel.org/stable/c/e0863634bf9f7cf36291ebb5bfa2d16632f79c49"}],"title":"net: ks8851: Queue RX packets in IRQ handler instead of disabling BHs","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.2,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-06-03T18:04:06.438716Z","id":"CVE-2024-36962","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-11-04T16:21:03.956Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T03:43:50.389Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ae87f661f3c1a3134a7ed86ab69bf9f12af88993","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/7e2901a2a9195da76111f351584bf77552a038f0","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e0863634bf9f7cf36291ebb5bfa2d16632f79c49","tags":["x_transferred"]}]}]}}