CVE-2026-98380

In the Linux kernel, the following vulnerability has been resolved:

net/sched: reject IDR error pointers when deleting actions

tcf_action_delete() drops the reference held by its lookup before calling tcf_idr_delete_index() with the saved action index. An unlocked classifier can remove that action and reserve the same IDR slot with ERR_PTR(-EBUSY) in between.

tcf_idr_delete_index() only checks the lookup result for NULL. It therefore treats the reservation as a tc_action and dereferences tcfa_bindcnt. A hardware execution breakpoint was used to schedule the interleaving without changing the kernel source. KASAN reported this decoded trace:

BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010 Read of size 4 at addr 0000000000000010 by task poc/150 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002 RIP: tca_action_gd+0x5c0/0x1010: arch_atomic_read at arch/x86/include/asm/atomic.h:23 raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457 atomic_read at include/linux/atomic/atomic-instrumented.h:33 tcf_idr_delete_index at net/sched/act_api.c:766 tcf_action_delete at net/sched/act_api.c:1859 tcf_del_notify at net/sched/act_api.c:2014 tca_action_gd at net/sched/act_api.c:2064 R13: 0000000000000010 R15: fffffffffffffff0 Kernel panic - not syncing: Fatal exception

R15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces the address in R13. With the guard applied, the same reproducer returned -ENOENT without a KASAN report or panic. Treat error pointers as absent and return -ENOENT.

Affected Software

References

• https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80
• https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d
• https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647
• https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d
• https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26
• https://git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f
• https://git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574
• https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923