tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72385
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:12 UTC
Updated2026-08-17 06:18:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry() fprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of the per-ip fprobe list and fills it in a second walk, both under rcu_read_lock() only. A fprobe registered on an already-live ip can become visible between the two walks, so the fill walk processes an exit_handler the sizing walk did not count and used runs past reserved_words. If the sizing walk counted nothing, fgraph_data is NULL and the first write_fprobe_header() faults: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167 Call Trace: <TASK> function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677 ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671 __kernel_text_address+0x9/0x40 kernel/extable.c:78 arch_stack_walk+0x117/0x170 arch/x86/kernel/stacktrace.c:26 kmem_cache_free+0x188/0x580 mm/slub.c:6378 tcp_data_queue+0x18d/0x6550 net/ipv4/tcp_input.c:5590 [...] </TASK> The list cannot be frozen across the two walks, so skip a node that does not fit the reservation and count it as missed.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.099060000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4346ba1604093305a287e08eb465a9c15ba05b80 62988204162fc382cfc7d9a185d40a751261e3a3 git Not specified
CNA Linux Linux affected 4346ba1604093305a287e08eb465a9c15ba05b80 d655cca1c6e67eb081214d37eb231a869ead2f97 git Not specified
CNA Linux Linux affected 4346ba1604093305a287e08eb465a9c15ba05b80 367c49d6e283c17b56a31e7a8d964a079244264c git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/367c49d6e283c17b56a31e7a8d964a079244264c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d655cca1c6e67eb081214d37eb231a869ead2f97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/62988204162fc382cfc7d9a185d40a751261e3a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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