CVE-2026-98589bpf: Reject pkt arguments in mutating subprogs
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: bpf: Reject pkt arguments in mutating subprogs The verifier tracks changes in how PTR_TO_PACKET registers' bounds are modified across subprog boundaries. PTR_TO_PACKET registers are actually passed as PTR_TO_MEM, which is assumed valid for the entire call. This is not the case with packet memory, where a pskb_* call may invalidate its memory region. Reject BPF code that passes PTR_TO_PACKET pointers to subprogs that may mutate a packet. We cannot pass the pointer as a true PTR_TO_PACKET because we would also need to somehow pass the PTR_TO_PACKET_META or PTR_TO_PACKET_END to the subprog. Since we cannot avoid representing the pointer in the subprog as PTR_TO_MEM, only permit it if the subprog is guaranteed not to mutate the packet.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a6c1edfbe240e4377038a0e1d233ad81fde9a21b; before 7.2.9 | CNA record |
References
- https://git.kernel.org/stable/c/0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea
- https://git.kernel.org/stable/c/a6c1edfbe240e4377038a0e1d233ad81fde9a21b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.