VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-98048: Linux kernel · bpf: don't rewrite bpf_fastcall patterns entered by a jump

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c4d3bdb3ab211dcfad734b02e06fcb12adb4757f : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c4d3bdb3ab211dcfad734b02e06fcb12adb4757f, a0cd1c3ac63504ba3c50c01a00c11812919b619f, 24adbc2c3bbe3385ce922587e1f8e837a68b3e25 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to c4d3bdb3ab211dcfad734b02e06fcb12adb4757f, a0cd1c3ac63504ba3c50c01a00c11812919b619f, 24adbc2c3bbe3385ce922587e1f8e837a68b3e25 or 0b1c83dc3c4401cd7e846548f62e3caf3d06742e.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5b5f51bff1b66cedb62b5ba74a1878341204e057, < c4d3bdb3ab211dcfad734b02e06fcb12adb4757f	Fixed in c4d3bdb3ab211dcfad734b02e06fcb12adb4757f
LinuxLinux	Affected ≥ 5b5f51bff1b66cedb62b5ba74a1878341204e057, < a0cd1c3ac63504ba3c50c01a00c11812919b619f	Fixed in a0cd1c3ac63504ba3c50c01a00c11812919b619f
LinuxLinux	Affected ≥ 5b5f51bff1b66cedb62b5ba74a1878341204e057, < 24adbc2c3bbe3385ce922587e1f8e837a68b3e25	Fixed in 24adbc2c3bbe3385ce922587e1f8e837a68b3e25
LinuxLinux	Affected ≥ 5b5f51bff1b66cedb62b5ba74a1878341204e057, < 0b1c83dc3c4401cd7e846548f62e3caf3d06742e	Fixed in 0b1c83dc3c4401cd7e846548f62e3caf3d06742e
LinuxLinux	Affected =6.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: don't rewrite bpf_fastcall patterns entered by a jump mark_fastcall_pattern_for_call() must ensure that matched "spill; call; fill" instruction series is not interrupted by a jump. Otherwise the rewrite applied by bpf_remove_fastcall_spills_fills() is not sound. Record the instructions targeted by jumps in insn_aux_data[*].jump_target when the CFG is built and use this flag to stop growing a pattern at such an instruction. Jumps to the first spill are fine. Note that existing insn_aux_data[*].jmp_point field can't be reused, as it marks subprogram return instructions.

References

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