In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_hash: unaligned atomic read on struct nft_set_ext
Access to genmask field in struct nft_set_ext results in unaligned
atomic read:
[ 72.130109] Unable to handle kernel paging request at virtual address ffff0000c2bb708c
[ 72.131036] Mem abort info:
[ 72.131213] ESR = 0x0000000096000021
[ 72.131446] EC = 0x25: DABT (current EL), IL = 32 bits
[ 72.132209] SET = 0, FnV = 0
[ 72.133216] EA = 0, S1PTW = 0
[ 72.134080] FSC = 0x21: alignment fault
[ 72.135593] Data abort info:
[ 72.137194] ISV = 0, ISS = 0x00000021, ISS2 = 0x00000000
[ 72.142351] CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[ 72.145989] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[ 72.150115] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000237d27000
[ 72.154893] [ffff0000c2bb708c] pgd=0000000000000000, p4d=180000023ffff403, pud=180000023f84b403, pmd=180000023f835403,
+pte=0068000102bb7707
[ 72.163021] Internal error: Oops: 0000000096000021 [#1] SMP
[...]
[ 72.170041] CPU: 7 UID: 0 PID: 54 Comm: kworker/7:0 Tainted: G E 6.13.0-rc3+ #2
[ 72.170509] Tainted: [E]=UNSIGNED_MODULE
[ 72.170720] Hardware name: QEMU QEMU Virtual Machine, BIOS edk2-stable202302-for-qemu 03/01/2023
[ 72.171192] Workqueue: events_power_efficient nft_rhash_gc [nf_tables]
[ 72.171552] pstate: 21400005 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[ 72.171915] pc : nft_rhash_gc+0x200/0x2d8 [nf_tables]
[ 72.172166] lr : nft_rhash_gc+0x128/0x2d8 [nf_tables]
[ 72.172546] sp : ffff800081f2bce0
[ 72.172724] x29: ffff800081f2bd40 x28: ffff0000c2bb708c x27: 0000000000000038
[ 72.173078] x26: ffff0000c6780ef0 x25: ffff0000c643df00 x24: ffff0000c6778f78
[ 72.173431] x23: 000000000000001a x22: ffff0000c4b1f000 x21: ffff0000c6780f78
[ 72.173782] x20: ffff0000c2bb70dc x19: ffff0000c2bb7080 x18: 0000000000000000
[ 72.174135] x17: ffff0000c0a4e1c0 x16: 0000000000003000 x15: 0000ac26d173b978
[ 72.174485] x14: ffffffffffffffff x13: 0000000000000030 x12: ffff0000c6780ef0
[ 72.174841] x11: 0000000000000000 x10: ffff800081f2bcf8 x9 : ffff0000c3000000
[ 72.175193] x8 : 00000000000004be x7 : 0000000000000000 x6 : 0000000000000000
[ 72.175544] x5 : 0000000000000040 x4 : ffff0000c3000010 x3 : 0000000000000000
[ 72.175871] x2 : 0000000000003a98 x1 : ffff0000c2bb708c x0 : 0000000000000004
[ 72.176207] Call trace:
[ 72.176316] nft_rhash_gc+0x200/0x2d8 [nf_tables] (P)
[ 72.176653] process_one_work+0x178/0x3d0
[ 72.176831] worker_thread+0x200/0x3f0
[ 72.176995] kthread+0xe8/0xf8
[ 72.177130] ret_from_fork+0x10/0x20
[ 72.177289] Code: 54fff984 d503201f d2800080 91003261 (f820303f)
[ 72.177557] ---[ end trace 0000000000000000 ]---
Align struct nft_set_ext to word size to address this and
documentation it.
pahole reports that this increases the size of elements for rhash and
pipapo in 8 bytes on x86_64.
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
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). 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 low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 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 low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from 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)14 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's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” 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