Description (CNA)
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)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e5dfb815181fcb186d6080ac3a091eadff2d98fe before 19f2ecf8ea564562c7e7a919cf38068dd9aa1c96; affected e5dfb815181fcb186d6080ac3a091eadff2d98fe before 3d054001860270748405a3f9270c5fa0bf7ffc19; affected e5dfb815181fcb186d6080ac3a091eadff2d98fe before fb31fbe51c233f3bf47021121f63d2e42cac2d08; affected e5dfb815181fcb186d6080ac3a091eadff2d98fe before 0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a; affected e5dfb815181fcb186d6080ac3a091eadff2d98fe before 6151159618198675e01c391676e579738286c135; affected e5dfb815181fcb186d6080ac3a091eadff2d98fe before f294fc71c4a0fa4964f6428a1b4e7929c1d83125 |
| Linux / Linux | affected 2.6.25; unaffected 0 before 2.6.25; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/19f2ecf8ea564562c7e7a919cf38068dd9aa1c96
- https://git.kernel.org/stable/c/3d054001860270748405a3f9270c5fa0bf7ffc19
- https://git.kernel.org/stable/c/fb31fbe51c233f3bf47021121f63d2e42cac2d08
- https://git.kernel.org/stable/c/0a8b5b74f0e6b6b9ce453bcfa4baa502c4c7577a
- https://git.kernel.org/stable/c/6151159618198675e01c391676e579738286c135
- https://git.kernel.org/stable/c/f294fc71c4a0fa4964f6428a1b4e7929c1d83125