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🛡️ CVE-2026-23378 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

net/sched: act_ife: Fix metalist update behavior

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

net/sched: act_ife: Fix metalist update behavior

Whenever an ife action replace changes the metalist, instead of

replacing the old data on the metalist, the current ife code is appending

the new metadata. Aside from being innapropriate behavior, this may lead

to an unbounded addition of metadata to the metalist which might cause an

out of bounds error when running the encode op:

[ 138.423369][ C1] ==================================================================

[ 138.424317][ C1] BUG: KASAN: slab-out-of-bounds in ife_tlv_meta_encode (net/ife/ife.c:168)

[ 138.424906][ C1] Write of size 4 at addr ffff8880077f4ffe by task ife_out_out_bou/255

[ 138.425778][ C1] CPU: 1 UID: 0 PID: 255 Comm: ife_out_out_bou Not tainted 7.0.0-rc1-00169-gfbdfa8da05b6 #624 PREEMPT(full)

[ 138.425795][ C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011

[ 138.425800][ C1] Call Trace:

[ 138.425804][ C1] <IRQ>

[ 138.425808][ C1] dump_stack_lvl (lib/dump_stack.c:122)

[ 138.425828][ C1] print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)

[ 138.425839][ C1] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)

[ 138.425844][ C1] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:95 (discriminator 1) ./include/linux/rcupdate.h:975 (discriminator 1) ./include/linux/mmzone.h:2207 (discriminator 1) arch/x86/mm/physaddr.c:54 (discriminator 1))

[ 138.425853][ C1] ? ife_tlv_meta_encode (net/ife/ife.c:168)

[ 138.425859][ C1] kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:597)

[ 138.425868][ C1] ? ife_tlv_meta_encode (net/ife/ife.c:168)

[ 138.425878][ C1] kasan_check_range (mm/kasan/generic.c:186 (discriminator 1) mm/kasan/generic.c:200 (discriminator 1))

[ 138.425884][ C1] __asan_memset (mm/kasan/shadow.c:84 (discriminator 2))

[ 138.425889][ C1] ife_tlv_meta_encode (net/ife/ife.c:168)

[ 138.425893][ C1] ? ife_tlv_meta_encode (net/ife/ife.c:171)

[ 138.425898][ C1] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)

[ 138.425903][ C1] ife_encode_meta_u16 (net/sched/act_ife.c:57)

[ 138.425910][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)

[ 138.425916][ C1] ? __asan_memcpy (mm/kasan/shadow.c:105 (discriminator 3))

[ 138.425921][ C1] ? __pfx_ife_encode_meta_u16 (net/sched/act_ife.c:45)

[ 138.425927][ C1] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221)

[ 138.425931][ C1] tcf_ife_act (net/sched/act_ife.c:847 net/sched/act_ife.c:879)

To solve this issue, fix the replace behavior by adding the metalist to

the ife rcu data structure.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-23378 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.7)
  • linux-kernel

Timeline and source

Published on 25 March 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

cert-portal.siemens.com (Web)
cert-portal.siemens.com (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-23378 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-03-25
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.7
linux-kernel — —

References

Similar Threats

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