CVE-2026-74290
Last modified
CVE-2026-74290 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
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)
Metrics
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e5dfb815181fcb186d6080ac3a091eadff2d98fe, < 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96; >= e5dfb815181fcb186d6080ac3a091eadff2d98fe, < 3d054001860270748405a3f9270c5fa0bf7ffc19; >= e5dfb815181fcb186d6080ac3a091eadff2d98fe, < fb31fbe51c233f3bf47021121f63d2e42cac2d08; >= e5dfb815181fcb186d6080ac3a091eadff2d98fe, < 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a; >= e5dfb815181fcb186d6080ac3a091eadff2d98fe, < 6151159618198675e01c391676e579738286c135; >= e5dfb815181fcb186d6080ac3a091eadff2d98fe, < f294fc71c4a0fa4964f6428a1b4e7929c1d83125 |
| Linux | Linux | 2.6.25 |
References
Timeline
- Published
- Last Modified
- Status
- Received
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