{"id":"CVE-2025-68320","state":"PUBLISHED","title":"lan966x: Fix sleeping in atomic context","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlan966x: Fix sleeping in atomic context\n\nThe following warning was seen when we try to connect using ssh to the device.\n\nBUG: sleeping function called from invalid context at kernel/locking/mutex.c:575\nin_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 104, name: dropbear\npreempt_count: 1, expected: 0\nINFO: lockdep is turned off.\nCPU: 0 UID: 0 PID: 104 Comm: dropbear Tainted: G        W           6.18.0-rc2-00399-g6f1ab1b109b9-dirty #530 NONE\nTainted: [W]=WARN\nHardware name: Generic DT based system\nCall trace:\n unwind_backtrace from show_stack+0x10/0x14\n show_stack from dump_stack_lvl+0x7c/0xac\n dump_stack_lvl from __might_resched+0x16c/0x2b0\n __might_resched from __mutex_lock+0x64/0xd34\n __mutex_lock from mutex_lock_nested+0x1c/0x24\n mutex_lock_nested from lan966x_stats_get+0x5c/0x558\n lan966x_stats_get from dev_get_stats+0x40/0x43c\n dev_get_stats from dev_seq_printf_stats+0x3c/0x184\n dev_seq_printf_stats from dev_seq_show+0x10/0x30\n dev_seq_show from seq_read_iter+0x350/0x4ec\n seq_read_iter from seq_read+0xfc/0x194\n seq_read from proc_reg_read+0xac/0x100\n proc_reg_read from vfs_read+0xb0/0x2b0\n vfs_read from ksys_read+0x6c/0xec\n ksys_read from ret_fast_syscall+0x0/0x1c\nException stack(0xf0b11fa8 to 0xf0b11ff0)\n1fa0:                   00000001 00001000 00000008 be9048d8 00001000 00000001\n1fc0: 00000001 00001000 00000008 00000003 be905920 0000001e 00000000 00000001\n1fe0: 0005404c be9048c0 00018684 b6ec2cd8\n\nIt seems that we are using a mutex in a atomic context which is wrong.\nChange the mutex with a spinlock.","publishedAt":"2025-12-16T15:44:18.217Z","updatedAt":"2026-10-30T12:23:11.604Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"cabb8cbeab49f4b74d78a91a277e00d4f6dd5d7d","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"5a5d2f7727752b64d13263eacd9f8d08a322e662","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"c8ab03aa5bd9fd8bfe5d9552d8605826759fdd4d","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"3ac743c60ec502163c435712d527eeced8d83348","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"0216721ce71252f60d89af49c8dff613358058d3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.h","drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.58","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.8","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.h","drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.c"]}],"references":["https://git.kernel.org/stable/c/cabb8cbeab49f4b74d78a91a277e00d4f6dd5d7d","https://git.kernel.org/stable/c/5a5d2f7727752b64d13263eacd9f8d08a322e662","https://git.kernel.org/stable/c/c8ab03aa5bd9fd8bfe5d9552d8605826759fdd4d","https://git.kernel.org/stable/c/3ac743c60ec502163c435712d527eeced8d83348","https://git.kernel.org/stable/c/0216721ce71252f60d89af49c8dff613358058d3"],"weaknesses":[],"ingestedAt":"2026-10-30T12:40:04.423Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68320.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68320","state":"PUBLISHED","datePublished":"2025-12-16T15:44:18.217Z","dateUpdated":"2026-10-30T12:23:11.604Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T14:48:05.295Z"},"containers":{"cna":{"title":"lan966x: Fix sleeping in atomic context","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nlan966x: Fix sleeping in atomic context\n\nThe following warning was seen when we try to connect using ssh to the device.\n\nBUG: sleeping function called from invalid context at kernel/locking/mutex.c:575\nin_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 104, name: dropbear\npreempt_count: 1, expected: 0\nINFO: lockdep is turned off.\nCPU: 0 UID: 0 PID: 104 Comm: dropbear Tainted: G        W           6.18.0-rc2-00399-g6f1ab1b109b9-dirty #530 NONE\nTainted: [W]=WARN\nHardware name: Generic DT based system\nCall trace:\n unwind_backtrace from show_stack+0x10/0x14\n show_stack from dump_stack_lvl+0x7c/0xac\n dump_stack_lvl from __might_resched+0x16c/0x2b0\n __might_resched from __mutex_lock+0x64/0xd34\n __mutex_lock from mutex_lock_nested+0x1c/0x24\n mutex_lock_nested from lan966x_stats_get+0x5c/0x558\n lan966x_stats_get from dev_get_stats+0x40/0x43c\n dev_get_stats from dev_seq_printf_stats+0x3c/0x184\n dev_seq_printf_stats from dev_seq_show+0x10/0x30\n dev_seq_show from seq_read_iter+0x350/0x4ec\n seq_read_iter from seq_read+0xfc/0x194\n seq_read from proc_reg_read+0xac/0x100\n proc_reg_read from vfs_read+0xb0/0x2b0\n vfs_read from ksys_read+0x6c/0xec\n ksys_read from ret_fast_syscall+0x0/0x1c\nException stack(0xf0b11fa8 to 0xf0b11ff0)\n1fa0:                   00000001 00001000 00000008 be9048d8 00001000 00000001\n1fc0: 00000001 00001000 00000008 00000003 be905920 0000001e 00000000 00000001\n1fe0: 0005404c be9048c0 00018684 b6ec2cd8\n\nIt seems that we are using a mutex in a atomic context which is wrong.\nChange the mutex with a spinlock."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"cabb8cbeab49f4b74d78a91a277e00d4f6dd5d7d","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"5a5d2f7727752b64d13263eacd9f8d08a322e662","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"c8ab03aa5bd9fd8bfe5d9552d8605826759fdd4d","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"3ac743c60ec502163c435712d527eeced8d83348","versionType":"git"},{"version":"12c2d0a5b8e2a1afc8c7738e19a0d1dd7f3d4007","status":"affected","lessThan":"0216721ce71252f60d89af49c8dff613358058d3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.h","drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.117","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.58","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.8","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/microchip/lan966x/lan966x_ethtool.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.c","drivers/net/ethernet/microchip/lan966x/lan966x_main.h","drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cabb8cbeab49f4b74d78a91a277e00d4f6dd5d7d"},{"url":"https://git.kernel.org/stable/c/5a5d2f7727752b64d13263eacd9f8d08a322e662"},{"url":"https://git.kernel.org/stable/c/c8ab03aa5bd9fd8bfe5d9552d8605826759fdd4d"},{"url":"https://git.kernel.org/stable/c/3ac743c60ec502163c435712d527eeced8d83348"},{"url":"https://git.kernel.org/stable/c/0216721ce71252f60d89af49c8dff613358058d3"}],"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 - An unauthenticated TCP connection to Dropbear reaches the flaw because its accept loop reads /proc/net/dev before forking or authentication. This is the network-facing embedded deployment documented by the fix.\nAC:L - Each accepted connection deterministically triggers the statistics read, and repeated connections can intersect the driver's periodic statistics-lock hold. No race condition outside the attacker's practical influence is required.\nPR:N - The vulnerable read occurs before SSH authentication, so no service credentials, local account, or kernel capability are required.\nUI:N - Once the network service is running, the attacker can trigger the flaw without any victim action.\nS:U - The resulting failure remains within the host kernel's security authority and does not cross a virtualization, sandbox, or IOMMU boundary.\nC:N - The affected code reads in-bounds cached counters and provides no attacker-visible kernel-memory disclosure or arbitrary-read primitive.\nI:N - The flaw provides no attacker-controlled memory write, data modification, or control-flow primitive.\nA:H - A contended mutex can force scheduling while RCU or preemption is disabled, causing scheduling-state corruption and a potential kernel panic or hang. Repeated pre-authentication connections can drive this condition."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:23:11.604Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.6.117"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.12.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.17.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}