In the Linux kernel, the following vulnerability has been resolved:
idpf: Fix RSS LUT NULL ptr issue after soft reset
During soft reset, the RSS LUT is freed and not restored unless the
interface is up. If an ethtool command that accesses the rss lut is
attempted immediately after reset, it will result in NULL ptr
dereference. Also, there is no need to reset the rss lut if the soft reset
does not involve queue count change.
After soft reset, set the RSS LUT to default values based on the updated
queue count only if the reset was a result of a queue count change and
the LUT was not configured by the user. In all other cases, don't touch
the LUT.
Steps to reproduce:
** Bring the interface down (if up)
ifconfig eth1 down
** update the queue count (eg., 27->20)
ethtool -L eth1 combined 20
** display the RSS LUT
ethtool -x eth1
[82375.558338] BUG: kernel NULL pointer dereference, address: 0000000000000000
[82375.558373] #PF: supervisor read access in kernel mode
[82375.558391] #PF: error_code(0x0000) - not-present page
[82375.558408] PGD 0 P4D 0
[82375.558421] Oops: Oops: 0000 [#1] SMP NOPTI
[82375.558516] RIP: 0010:idpf_get_rxfh+0x108/0x150 [idpf]
[82375.558786] Call Trace:
[82375.558793]
[82375.558804] rss_prepare.isra.0+0x187/0x2a0
[82375.558827] rss_prepare_data+0x3a/0x50
[82375.558845] ethnl_default_doit+0x13d/0x3e0
[82375.558863] genl_family_rcv_msg_doit+0x11f/0x180
[82375.558886] genl_rcv_msg+0x1ad/0x2b0
[82375.558902] ? __pfx_ethnl_default_doit+0x10/0x10
[82375.558920] ? __pfx_genl_rcv_msg+0x10/0x10
[82375.558937] netlink_rcv_skb+0x58/0x100
[82375.558957] genl_rcv+0x2c/0x50
[82375.558971] netlink_unicast+0x289/0x3e0
[82375.558988] netlink_sendmsg+0x215/0x440
[82375.559005] __sys_sendto+0x234/0x240
[82375.559555] __x64_sys_sendto+0x28/0x30
[82375.560068] x64_sys_call+0x1909/0x1da0
[82375.560576] do_syscall_64+0x7a/0xfa0
[82375.561076] ? clear_bhb_loop+0x60/0xb0
[82375.561567] entry_SYSCALL_64_after_hwframe+0x76/0x7e
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-05). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it