CVE-2024-40980 (GCVE-0-2024-40980)
Vulnerability from cvelistv5 – Published: 2024-07-12 12:32 – Updated: 2026-10-15 00:46
VLAI
EPSS
VEX
Title
drop_monitor: replace spin_lock by raw_spin_lock
Summary
In the Linux kernel, the following vulnerability has been resolved:
drop_monitor: replace spin_lock by raw_spin_lock
trace_drop_common() is called with preemption disabled, and it acquires
a spin_lock. This is problematic for RT kernels because spin_locks are
sleeping locks in this configuration, which causes the following splat:
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 449, name: rcuc/47
preempt_count: 1, expected: 0
RCU nest depth: 2, expected: 2
5 locks held by rcuc/47/449:
#0: ff1100086ec30a60 ((softirq_ctrl.lock)){+.+.}-{2:2}, at: __local_bh_disable_ip+0x105/0x210
#1: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0xbf/0x130
#2: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: __local_bh_disable_ip+0x11c/0x210
#3: ffffffffb394a160 (rcu_callback){....}-{0:0}, at: rcu_do_batch+0x360/0xc70
#4: ff1100086ee07520 (&data->lock){+.+.}-{2:2}, at: trace_drop_common.constprop.0+0xb5/0x290
irq event stamp: 139909
hardirqs last enabled at (139908): [<ffffffffb1df2b33>] _raw_spin_unlock_irqrestore+0x63/0x80
hardirqs last disabled at (139909): [<ffffffffb19bd03d>] trace_drop_common.constprop.0+0x26d/0x290
softirqs last enabled at (139892): [<ffffffffb07a1083>] __local_bh_enable_ip+0x103/0x170
softirqs last disabled at (139898): [<ffffffffb0909b33>] rcu_cpu_kthread+0x93/0x1f0
Preemption disabled at:
[<ffffffffb1de786b>] rt_mutex_slowunlock+0xab/0x2e0
CPU: 47 PID: 449 Comm: rcuc/47 Not tainted 6.9.0-rc2-rt1+ #7
Hardware name: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 04/15/2022
Call Trace:
<TASK>
dump_stack_lvl+0x8c/0xd0
dump_stack+0x14/0x20
__might_resched+0x21e/0x2f0
rt_spin_lock+0x5e/0x130
? trace_drop_common.constprop.0+0xb5/0x290
? skb_queue_purge_reason.part.0+0x1bf/0x230
trace_drop_common.constprop.0+0xb5/0x290
? preempt_count_sub+0x1c/0xd0
? _raw_spin_unlock_irqrestore+0x4a/0x80
? __pfx_trace_drop_common.constprop.0+0x10/0x10
? rt_mutex_slowunlock+0x26a/0x2e0
? skb_queue_purge_reason.part.0+0x1bf/0x230
? __pfx_rt_mutex_slowunlock+0x10/0x10
? skb_queue_purge_reason.part.0+0x1bf/0x230
trace_kfree_skb_hit+0x15/0x20
trace_kfree_skb+0xe9/0x150
kfree_skb_reason+0x7b/0x110
skb_queue_purge_reason.part.0+0x1bf/0x230
? __pfx_skb_queue_purge_reason.part.0+0x10/0x10
? mark_lock.part.0+0x8a/0x520
...
trace_drop_common() also disables interrupts, but this is a minor issue
because we could easily replace it with a local_lock.
Replace the spin_lock with raw_spin_lock to avoid sleeping in atomic
context.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:02 UTC
Assigner
References
11 references
Impacted products
6 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < 594e47957f3fe034645e6885393ce96c12286334
(git)
Affected: 4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < 96941f29ebcc1e9cbf570dc903f30374909562f5 (git) Affected: 4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < b3722fb69468693555f531cddda5c30444726dac (git) Affected: 4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < f251ccef1d864790e5253386e95544420b7cd8f3 (git) Affected: 4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < 76ce2f9125244e1708d29c1d3f9d1d50b347bda0 (git) Affected: 4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < 07ea878684dfb78a9d4f564c39d07e855a9e242e (git) Affected: 4ea7e38696c7e798c47ebbecadfd392f23f814f9 , < f1e197a665c2148ebc25fe09c53689e60afea195 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.31
Unaffected: 0 , < 2.6.31 (semver) Unaffected: 5.4.279 , ≤ 5.4.* (semver) Unaffected: 5.10.221 , ≤ 5.10.* (semver) Unaffected: 5.15.162 , ≤ 5.15.* (semver) Unaffected: 6.1.96 , ≤ 6.1.* (semver) Unaffected: 6.6.36 , ≤ 6.6.* (semver) Unaffected: 6.9.7 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | RUGGEDCOM RST2428P |
Affected:
0 , < V3.1
(custom)
|
guessed | |
| Siemens | SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family |
Unaffected:
0 , < *
(custom)
|
guessed | |
| Siemens | SCALANCE XCM-/XRM-/XCH-/XRH-300 family |
Affected:
0 , < V3.1
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < V1.1.1
(custom)
|
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: replace spin_lock by raw_spin_lock\n\ntrace_drop_common() is called with preemption disabled, and it acquires\na spin_lock. This is problematic for RT kernels because spin_locks are\nsleeping locks in this configuration, which causes the following splat:\n\nBUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\nin_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 449, name: rcuc/47\npreempt_count: 1, expected: 0\nRCU nest depth: 2, expected: 2\n5 locks held by rcuc/47/449:\n #0: ff1100086ec30a60 ((softirq_ctrl.lock)){+.+.}-{2:2}, at: __local_bh_disable_ip+0x105/0x210\n #1: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0xbf/0x130\n #2: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: __local_bh_disable_ip+0x11c/0x210\n #3: ffffffffb394a160 (rcu_callback){....}-{0:0}, at: rcu_do_batch+0x360/0xc70\n #4: ff1100086ee07520 (\u0026data-\u003elock){+.+.}-{2:2}, at: trace_drop_common.constprop.0+0xb5/0x290\nirq event stamp: 139909\nhardirqs last enabled at (139908): [\u003cffffffffb1df2b33\u003e] _raw_spin_unlock_irqrestore+0x63/0x80\nhardirqs last disabled at (139909): [\u003cffffffffb19bd03d\u003e] trace_drop_common.constprop.0+0x26d/0x290\nsoftirqs last enabled at (139892): [\u003cffffffffb07a1083\u003e] __local_bh_enable_ip+0x103/0x170\nsoftirqs last disabled at (139898): [\u003cffffffffb0909b33\u003e] rcu_cpu_kthread+0x93/0x1f0\nPreemption disabled at:\n[\u003cffffffffb1de786b\u003e] rt_mutex_slowunlock+0xab/0x2e0\nCPU: 47 PID: 449 Comm: rcuc/47 Not tainted 6.9.0-rc2-rt1+ #7\nHardware name: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 04/15/2022\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x8c/0xd0\n dump_stack+0x14/0x20\n __might_resched+0x21e/0x2f0\n rt_spin_lock+0x5e/0x130\n ? trace_drop_common.constprop.0+0xb5/0x290\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_drop_common.constprop.0+0xb5/0x290\n ? preempt_count_sub+0x1c/0xd0\n ? _raw_spin_unlock_irqrestore+0x4a/0x80\n ? __pfx_trace_drop_common.constprop.0+0x10/0x10\n ? rt_mutex_slowunlock+0x26a/0x2e0\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_rt_mutex_slowunlock+0x10/0x10\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_kfree_skb_hit+0x15/0x20\n trace_kfree_skb+0xe9/0x150\n kfree_skb_reason+0x7b/0x110\n skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_skb_queue_purge_reason.part.0+0x10/0x10\n ? mark_lock.part.0+0x8a/0x520\n...\n\ntrace_drop_common() also disables interrupts, but this is a minor issue\nbecause we could easily replace it with a local_lock.\n\nReplace the spin_lock with raw_spin_lock to avoid sleeping in atomic\ncontext."
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"value": "AV:N - `trace_drop_common()` is reached from the NET_RX softirq drop paths in `ip_rcv`/`udp_rcv`/netfilter via `kfree_skb_reason()` \u2192 `trace_kfree_skb()`, so any remote peer sending packets that get dropped (bad checksum, no listener, unknown protocol, firewall DROP) drives the vulnerable code. Per kernel guidance, net/ stack bugs reachable via received packets are Network.\nAC:L - Every single dropped skb deterministically enters `local_irq_save()` + `rt_spin_lock()` on an RT kernel, and the attacker fully controls both the trigger rate and the lock contention against the alert timer/worker by flooding drops. Prior kernel-CNA scoring of PREEMPT_RT sleeping-in-atomic fixes (CVE-2024-56585, CVE-2024-50249) treats the RT build as the vulnerable configuration rather than an AC:H condition.\nPR:N - The attacker needs no account or credentials \u2014 merely sending packets that the stack drops is enough. The `CAP_NET_ADMIN`-in-`init_user_ns` check on `NET_DM_CMD_START` gates the operator\u0027s own monitoring action (running `dropwatch`), which is an environmental precondition of the vulnerable state, not a privilege the attacker must obtain.\nUI:N - Once drop monitoring is active, no victim action is required \u2014 the packets the attacker sends are themselves sufficient to enter `trace_drop_common()`. No file, mount, or user-triggered operation is involved.\nS:U - The faulting context, the corrupted preempt/RCU nesting state, and the resulting hang all live entirely within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The fix changes only the lock type; `data-\u003eskb`, the netlink message construction, and every byte of data handling are identical before and after. No out-of-bounds read, freed-memory read, or uninitialised data reaches the attacker.\nI:N - No memory is corrupted, overwritten, or type-confused \u2014 `raw_spin_lock` provides the same mutual exclusion as `spin_lock` did, so no attacker-influenced data modification is possible. There is no write primitive or control-flow hijack.\nA:H - On PREEMPT_RT, `rt_spin_lock()` under `local_irq_save()` is sleeping in atomic context \u2014 it emits a \"BUG: sleeping function called from invalid context\" splat (immediate panic under `panic_on_warn`), and on contention calls `schedule_rtlock()` with hard IRQs disabled, corrupting preempt/RCU nesting and hanging the CPU. This is remotely repeatable at packet rate."
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: replace spin_lock by raw_spin_lock\n\ntrace_drop_common() is called with preemption disabled, and it acquires\na spin_lock. This is problematic for RT kernels because spin_locks are\nsleeping locks in this configuration, which causes the following splat:\n\nBUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\nin_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 449, name: rcuc/47\npreempt_count: 1, expected: 0\nRCU nest depth: 2, expected: 2\n5 locks held by rcuc/47/449:\n #0: ff1100086ec30a60 ((softirq_ctrl.lock)){+.+.}-{2:2}, at: __local_bh_disable_ip+0x105/0x210\n #1: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0xbf/0x130\n #2: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: __local_bh_disable_ip+0x11c/0x210\n #3: ffffffffb394a160 (rcu_callback){....}-{0:0}, at: rcu_do_batch+0x360/0xc70\n #4: ff1100086ee07520 (\u0026data-\u003elock){+.+.}-{2:2}, at: trace_drop_common.constprop.0+0xb5/0x290\nirq event stamp: 139909\nhardirqs last enabled at (139908): [\u003cffffffffb1df2b33\u003e] _raw_spin_unlock_irqrestore+0x63/0x80\nhardirqs last disabled at (139909): [\u003cffffffffb19bd03d\u003e] trace_drop_common.constprop.0+0x26d/0x290\nsoftirqs last enabled at (139892): [\u003cffffffffb07a1083\u003e] __local_bh_enable_ip+0x103/0x170\nsoftirqs last disabled at (139898): [\u003cffffffffb0909b33\u003e] rcu_cpu_kthread+0x93/0x1f0\nPreemption disabled at:\n[\u003cffffffffb1de786b\u003e] rt_mutex_slowunlock+0xab/0x2e0\nCPU: 47 PID: 449 Comm: rcuc/47 Not tainted 6.9.0-rc2-rt1+ #7\nHardware name: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 04/15/2022\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x8c/0xd0\n dump_stack+0x14/0x20\n __might_resched+0x21e/0x2f0\n rt_spin_lock+0x5e/0x130\n ? trace_drop_common.constprop.0+0xb5/0x290\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_drop_common.constprop.0+0xb5/0x290\n ? preempt_count_sub+0x1c/0xd0\n ? _raw_spin_unlock_irqrestore+0x4a/0x80\n ? __pfx_trace_drop_common.constprop.0+0x10/0x10\n ? rt_mutex_slowunlock+0x26a/0x2e0\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_rt_mutex_slowunlock+0x10/0x10\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_kfree_skb_hit+0x15/0x20\n trace_kfree_skb+0xe9/0x150\n kfree_skb_reason+0x7b/0x110\n skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_skb_queue_purge_reason.part.0+0x10/0x10\n ? mark_lock.part.0+0x8a/0x520\n...\n\ntrace_drop_common() also disables interrupts, but this is a minor issue\nbecause we could easily replace it with a local_lock.\n\nReplace the spin_lock with raw_spin_lock to avoid sleeping in atomic\ncontext."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: drop_monitor: reemplaza spin_lock por raw_spin_lock Se llama a trace_drop_common() con la preferencia deshabilitada y adquiere un spin_lock. Esto es problem\u00e1tico para los kernels RT porque los spin_locks son bloqueos inactivos en esta configuraci\u00f3n, lo que provoca el siguiente s\u00edmbolo: ERROR: funci\u00f3n inactiva llamada desde un contexto no v\u00e1lido en kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 1 , non_block: 0, pid: 449, nombre: rcuc/47 preempt_count: 1, esperado: 0 Profundidad del nido de RCU: 2, esperado: 2 5 bloqueos retenidos por rcuc/47/449: #0: ff1100086ec30a60 ((softirq_ctrl.lock) ){+.+.}-{2:2}, en: __local_bh_disable_ip+0x105/0x210 #1: fffffffffb394a280 (rcu_read_lock){....}-{1:2}, en: rt_spin_lock+0xbf/0x130 #2 : ffffffffb394a280 (rcu_read_lock){....}-{1:2}, en: __local_bh_disable_ip+0x11c/0x210 #3: ffffffffb394a160 (rcu_callback){....}-{0:0}, en: rcu_do_batch+0x360 /0xc70 #4: ff1100086ee07520 (\u0026amp;data-\u0026gt;lock){+.+.}-{2:2}, en: trace_drop_common.constprop.0+0xb5/0x290 sello de evento irq: 139909 hardirqs habilitado por \u00faltima vez en (139908): [ ] _raw_spin_unlock_irqrestore+0x63/0x80 hardirqs deshabilitado por \u00faltima vez en (139909): [] trace_drop_common.constprop.0+0x26d/0x290 softirqs habilitado por \u00faltima vez en (139892): [ ] __local_bh_enable_ip+0x103/0x170 softirqs \u00faltimamente deshabilitado en (139898): [] rcu_cpu_kthread+0x93/0x1f0 Prelaci\u00f3n deshabilitada en: [] rt_mutex_slowunlock+0xab/0x2e0 CPU: 47 PID: 449 Comm: rcuc/47 No contaminado 6.9.0-rc2 - rt1+ #7 Nombre del hardware: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 15/04/2022 Seguimiento de llamadas: dump_stack_lvl+0x8c/0xd0 dump_stack+0x14/0x20 __might_resched+0x21e/0x2f0 rt_spin_lock+0x5e/0x130 ? trace_drop_common.constprop.0+0xb5/0x290? skb_queue_purge_reason.part.0+0x1bf/0x230 trace_drop_common.constprop.0+0xb5/0x290 ? preempt_count_sub+0x1c/0xd0? _raw_spin_unlock_irqrestore+0x4a/0x80? __pfx_trace_drop_common.constprop.0+0x10/0x10? rt_mutex_slowunlock+0x26a/0x2e0? skb_queue_purge_reason.part.0+0x1bf/0x230? __pfx_rt_mutex_slowunlock+0x10/0x10? skb_queue_purge_reason.part.0+0x1bf/0x230 trace_kfree_skb_hit+0x15/0x20 trace_kfree_skb+0xe9/0x150 kfree_skb_reason+0x7b/0x110 skb_queue_purge_reason.part.0+0x1bf/0x230 ? __pfx_skb_queue_purge_reason.part.0+0x10/0x10 ? mark_lock.part.0+0x8a/0x520 ... trace_drop_common() tambi\u00e9n desactiva las interrupciones, pero este es un problema menor porque podr\u00edamos reemplazarlo f\u00e1cilmente con local_lock. Reemplace spin_lock con raw_spin_lock para evitar dormir en un contexto at\u00f3mico."
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: replace spin_lock by raw_spin_lock\n\ntrace_drop_common() is called with preemption disabled, and it acquires\na spin_lock. This is problematic for RT kernels because spin_locks are\nsleeping locks in this configuration, which causes the following splat:\n\nBUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\nin_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 449, name: rcuc/47\npreempt_count: 1, expected: 0\nRCU nest depth: 2, expected: 2\n5 locks held by rcuc/47/449:\n #0: ff1100086ec30a60 ((softirq_ctrl.lock)){+.+.}-{2:2}, at: __local_bh_disable_ip+0x105/0x210\n #1: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0xbf/0x130\n #2: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: __local_bh_disable_ip+0x11c/0x210\n #3: ffffffffb394a160 (rcu_callback){....}-{0:0}, at: rcu_do_batch+0x360/0xc70\n #4: ff1100086ee07520 (\u0026data-\u003elock){+.+.}-{2:2}, at: trace_drop_common.constprop.0+0xb5/0x290\nirq event stamp: 139909\nhardirqs last enabled at (139908): [\u003cffffffffb1df2b33\u003e] _raw_spin_unlock_irqrestore+0x63/0x80\nhardirqs last disabled at (139909): [\u003cffffffffb19bd03d\u003e] trace_drop_common.constprop.0+0x26d/0x290\nsoftirqs last enabled at (139892): [\u003cffffffffb07a1083\u003e] __local_bh_enable_ip+0x103/0x170\nsoftirqs last disabled at (139898): [\u003cffffffffb0909b33\u003e] rcu_cpu_kthread+0x93/0x1f0\nPreemption disabled at:\n[\u003cffffffffb1de786b\u003e] rt_mutex_slowunlock+0xab/0x2e0\nCPU: 47 PID: 449 Comm: rcuc/47 Not tainted 6.9.0-rc2-rt1+ #7\nHardware name: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 04/15/2022\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x8c/0xd0\n dump_stack+0x14/0x20\n __might_resched+0x21e/0x2f0\n rt_spin_lock+0x5e/0x130\n ? trace_drop_common.constprop.0+0xb5/0x290\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_drop_common.constprop.0+0xb5/0x290\n ? preempt_count_sub+0x1c/0xd0\n ? _raw_spin_unlock_irqrestore+0x4a/0x80\n ? __pfx_trace_drop_common.constprop.0+0x10/0x10\n ? rt_mutex_slowunlock+0x26a/0x2e0\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_rt_mutex_slowunlock+0x10/0x10\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_kfree_skb_hit+0x15/0x20\n trace_kfree_skb+0xe9/0x150\n kfree_skb_reason+0x7b/0x110\n skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_skb_queue_purge_reason.part.0+0x10/0x10\n ? mark_lock.part.0+0x8a/0x520\n...\n\ntrace_drop_common() also disables interrupts, but this is a minor issue\nbecause we could easily replace it with a local_lock.\n\nReplace the spin_lock with raw_spin_lock to avoid sleeping in atomic\ncontext."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: drop_monitor: reemplaza spin_lock por raw_spin_lock Se llama a trace_drop_common() con la preferencia deshabilitada y adquiere un spin_lock. Esto es problem\u00e1tico para los kernels RT porque los spin_locks son bloqueos inactivos en esta configuraci\u00f3n, lo que provoca el siguiente s\u00edmbolo: ERROR: funci\u00f3n inactiva llamada desde un contexto no v\u00e1lido en kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 1 , non_block: 0, pid: 449, nombre: rcuc/47 preempt_count: 1, esperado: 0 Profundidad del nido de RCU: 2, esperado: 2 5 bloqueos retenidos por rcuc/47/449: #0: ff1100086ec30a60 ((softirq_ctrl.lock) ){+.+.}-{2:2}, en: __local_bh_disable_ip+0x105/0x210 #1: fffffffffb394a280 (rcu_read_lock){....}-{1:2}, en: rt_spin_lock+0xbf/0x130 #2 : ffffffffb394a280 (rcu_read_lock){....}-{1:2}, en: __local_bh_disable_ip+0x11c/0x210 #3: ffffffffb394a160 (rcu_callback){....}-{0:0}, en: rcu_do_batch+0x360 /0xc70 #4: ff1100086ee07520 (\u0026amp;data-\u0026gt;lock){+.+.}-{2:2}, en: trace_drop_common.constprop.0+0xb5/0x290 sello de evento irq: 139909 hardirqs habilitado por \u00faltima vez en (139908): [ ] _raw_spin_unlock_irqrestore+0x63/0x80 hardirqs deshabilitado por \u00faltima vez en (139909): [] trace_drop_common.constprop.0+0x26d/0x290 softirqs habilitado por \u00faltima vez en (139892): [ ] __local_bh_enable_ip+0x103/0x170 softirqs \u00faltimamente deshabilitado en (139898): [] rcu_cpu_kthread+0x93/0x1f0 Prelaci\u00f3n deshabilitada en: [] rt_mutex_slowunlock+0xab/0x2e0 CPU: 47 PID: 449 Comm: rcuc/47 No contaminado 6.9.0-rc2 - rt1+ #7 Nombre del hardware: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 15/04/2022 Seguimiento de llamadas: dump_stack_lvl+0x8c/0xd0 dump_stack+0x14/0x20 __might_resched+0x21e/0x2f0 rt_spin_lock+0x5e/0x130 ? trace_drop_common.constprop.0+0xb5/0x290? skb_queue_purge_reason.part.0+0x1bf/0x230 trace_drop_common.constprop.0+0xb5/0x290 ? preempt_count_sub+0x1c/0xd0? _raw_spin_unlock_irqrestore+0x4a/0x80? __pfx_trace_drop_common.constprop.0+0x10/0x10? rt_mutex_slowunlock+0x26a/0x2e0? skb_queue_purge_reason.part.0+0x1bf/0x230? __pfx_rt_mutex_slowunlock+0x10/0x10? skb_queue_purge_reason.part.0+0x1bf/0x230 trace_kfree_skb_hit+0x15/0x20 trace_kfree_skb+0xe9/0x150 kfree_skb_reason+0x7b/0x110 skb_queue_purge_reason.part.0+0x1bf/0x230 ? __pfx_skb_queue_purge_reason.part.0+0x10/0x10 ? mark_lock.part.0+0x8a/0x520 ... trace_drop_common() tambi\u00e9n desactiva las interrupciones, pero este es un problema menor porque podr\u00edamos reemplazarlo f\u00e1cilmente con local_lock. Reemplace spin_lock con raw_spin_lock para evitar dormir en un contexto at\u00f3mico."
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.162",
"versionStartIncluding": "2.6.31",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.96",
"versionStartIncluding": "2.6.31",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.36",
"versionStartIncluding": "2.6.31",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9.7",
"versionStartIncluding": "2.6.31",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.10",
"versionStartIncluding": "2.6.31",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: replace spin_lock by raw_spin_lock\n\ntrace_drop_common() is called with preemption disabled, and it acquires\na spin_lock. This is problematic for RT kernels because spin_locks are\nsleeping locks in this configuration, which causes the following splat:\n\nBUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\nin_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 449, name: rcuc/47\npreempt_count: 1, expected: 0\nRCU nest depth: 2, expected: 2\n5 locks held by rcuc/47/449:\n #0: ff1100086ec30a60 ((softirq_ctrl.lock)){+.+.}-{2:2}, at: __local_bh_disable_ip+0x105/0x210\n #1: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0xbf/0x130\n #2: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: __local_bh_disable_ip+0x11c/0x210\n #3: ffffffffb394a160 (rcu_callback){....}-{0:0}, at: rcu_do_batch+0x360/0xc70\n #4: ff1100086ee07520 (\u0026data-\u003elock){+.+.}-{2:2}, at: trace_drop_common.constprop.0+0xb5/0x290\nirq event stamp: 139909\nhardirqs last enabled at (139908): [\u003cffffffffb1df2b33\u003e] _raw_spin_unlock_irqrestore+0x63/0x80\nhardirqs last disabled at (139909): [\u003cffffffffb19bd03d\u003e] trace_drop_common.constprop.0+0x26d/0x290\nsoftirqs last enabled at (139892): [\u003cffffffffb07a1083\u003e] __local_bh_enable_ip+0x103/0x170\nsoftirqs last disabled at (139898): [\u003cffffffffb0909b33\u003e] rcu_cpu_kthread+0x93/0x1f0\nPreemption disabled at:\n[\u003cffffffffb1de786b\u003e] rt_mutex_slowunlock+0xab/0x2e0\nCPU: 47 PID: 449 Comm: rcuc/47 Not tainted 6.9.0-rc2-rt1+ #7\nHardware name: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 04/15/2022\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x8c/0xd0\n dump_stack+0x14/0x20\n __might_resched+0x21e/0x2f0\n rt_spin_lock+0x5e/0x130\n ? trace_drop_common.constprop.0+0xb5/0x290\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_drop_common.constprop.0+0xb5/0x290\n ? preempt_count_sub+0x1c/0xd0\n ? _raw_spin_unlock_irqrestore+0x4a/0x80\n ? __pfx_trace_drop_common.constprop.0+0x10/0x10\n ? rt_mutex_slowunlock+0x26a/0x2e0\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_rt_mutex_slowunlock+0x10/0x10\n ? skb_queue_purge_reason.part.0+0x1bf/0x230\n trace_kfree_skb_hit+0x15/0x20\n trace_kfree_skb+0xe9/0x150\n kfree_skb_reason+0x7b/0x110\n skb_queue_purge_reason.part.0+0x1bf/0x230\n ? __pfx_skb_queue_purge_reason.part.0+0x10/0x10\n ? mark_lock.part.0+0x8a/0x520\n...\n\ntrace_drop_common() also disables interrupts, but this is a minor issue\nbecause we could easily replace it with a local_lock.\n\nReplace the spin_lock with raw_spin_lock to avoid sleeping in atomic\ncontext."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - `trace_drop_common()` is reached from the NET_RX softirq drop paths in `ip_rcv`/`udp_rcv`/netfilter via `kfree_skb_reason()` \u2192 `trace_kfree_skb()`, so any remote peer sending packets that get dropped (bad checksum, no listener, unknown protocol, firewall DROP) drives the vulnerable code. Per kernel guidance, net/ stack bugs reachable via received packets are Network.\nAC:L - Every single dropped skb deterministically enters `local_irq_save()` + `rt_spin_lock()` on an RT kernel, and the attacker fully controls both the trigger rate and the lock contention against the alert timer/worker by flooding drops. Prior kernel-CNA scoring of PREEMPT_RT sleeping-in-atomic fixes (CVE-2024-56585, CVE-2024-50249) treats the RT build as the vulnerable configuration rather than an AC:H condition.\nPR:N - The attacker needs no account or credentials \u2014 merely sending packets that the stack drops is enough. The `CAP_NET_ADMIN`-in-`init_user_ns` check on `NET_DM_CMD_START` gates the operator\u0027s own monitoring action (running `dropwatch`), which is an environmental precondition of the vulnerable state, not a privilege the attacker must obtain.\nUI:N - Once drop monitoring is active, no victim action is required \u2014 the packets the attacker sends are themselves sufficient to enter `trace_drop_common()`. No file, mount, or user-triggered operation is involved.\nS:U - The faulting context, the corrupted preempt/RCU nesting state, and the resulting hang all live entirely within the kernel\u0027s own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The fix changes only the lock type; `data-\u003eskb`, the netlink message construction, and every byte of data handling are identical before and after. No out-of-bounds read, freed-memory read, or uninitialised data reaches the attacker.\nI:N - No memory is corrupted, overwritten, or type-confused \u2014 `raw_spin_lock` provides the same mutual exclusion as `spin_lock` did, so no attacker-influenced data modification is possible. There is no write primitive or control-flow hijack.\nA:H - On PREEMPT_RT, `rt_spin_lock()` under `local_irq_save()` is sleeping in atomic context \u2014 it emits a \"BUG: sleeping function called from invalid context\" splat (immediate panic under `panic_on_warn`), and on contention calls `schedule_rtlock()` with hard IRQs disabled, corrupting preempt/RCU nesting and hanging the CPU. This is remotely repeatable at packet rate."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:34:22.774Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/594e47957f3fe034645e6885393ce96c12286334"
},
{
"url": "https://git.kernel.org/stable/c/96941f29ebcc1e9cbf570dc903f30374909562f5"
},
{
"url": "https://git.kernel.org/stable/c/b3722fb69468693555f531cddda5c30444726dac"
},
{
"url": "https://git.kernel.org/stable/c/f251ccef1d864790e5253386e95544420b7cd8f3"
},
{
"url": "https://git.kernel.org/stable/c/76ce2f9125244e1708d29c1d3f9d1d50b347bda0"
},
{
"url": "https://git.kernel.org/stable/c/07ea878684dfb78a9d4f564c39d07e855a9e242e"
},
{
"url": "https://git.kernel.org/stable/c/f1e197a665c2148ebc25fe09c53689e60afea195"
}
],
"title": "drop_monitor: replace spin_lock by raw_spin_lock",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-40980",
"datePublished": "2024-07-12T12:32:15.569Z",
"dateReserved": "2024-07-12T12:17:45.604Z",
"dateUpdated": "2026-10-15T00:46:31.441Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.