Answer in brief
CVE-2026-74290 records a Unknown severity vulnerability in net/sched: cls_flow: Dont expose folded kernel pointers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <3d054001860270748405a3f9270c5fa0bf7ffc19 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <fb31fbe51c233f3bf47021121f63d2e42cac2d08 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <6151159618198675e01c391676e579738286c135 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <f294fc71c4a0fa4964f6428a1b4e7929c1d83125 | 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96, 3d054001860270748405a3f9270c5fa0bf7ffc19, fb31fbe51c233f3bf47021121f63d2e42cac2d08, 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a, 6151159618198675e01c391676e579738286c135, f294fc71c4a0fa4964f6428a1b4e7929c1d83125 |
| Linux/Linuxgeneric | 2.6.25 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: Dont expose folded kernel pointers The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct(). Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74290 records a Unknown severity vulnerability in net/sched: cls_flow: Dont expose folded kernel pointers. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <19f2ecf8ea564562c7e7a919cf38068dd9aa1c96 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <3d054001860270748405a3f9270c5fa0bf7ffc19 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <fb31fbe51c233f3bf47021121f63d2e42cac2d08 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <6151159618198675e01c391676e579738286c135 || >=e5dfb815181fcb186d6080ac3a091eadff2d98fe <f294fc71c4a0fa4964f6428a1b4e7929c1d83125 | 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96, 3d054001860270748405a3f9270c5fa0bf7ffc19, fb31fbe51c233f3bf47021121f63d2e42cac2d08, 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a, 6151159618198675e01c391676e579738286c135, f294fc71c4a0fa4964f6428a1b4e7929c1d83125 |
| Linux/Linuxgeneric | 2.6.25 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: Dont expose folded kernel pointers The flow classifier falls back to addr_fold() for fields that are missing from packet headers. In map mode, userspace controls mask, xor, rshift, addend and divisor, and can observe the resulting classid through class statistics. This allows a tc classifier in a user/network namespace to recover the 32-bit folded value of skb->sk, skb_dst() or skb_nfct(). Align with standard kernel practices for pointer hashing and replace the XOR folding with a keyed siphash (which is cryptographically secure)
Quoted source text, attributed separately from HOL analysis.