x86/kprobes: Fix crash when probing CS CALL instructions
In the Linux kernel, the following vulnerability has been resolved: x86/kprobes: Fix crash when probing CS CALL instructions When using eBPF to probe CS CALL instructions within a function, a crash can be triggered. The eBPF tool probes offset 257 of the __hrtimer_run_queues() function: <__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1) <__hrtimer_run_queues+254>: mov %r14,%rdi <__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12> <__hrtimer_run_queues+263>: mov %eax,%r12d <__hrtimer_run_queues+266>: xchg %ax,%ax <__hrtimer_run_queues+268>: mov %r13,%rdi Which triggers this crash: BUG: unable to handle page fault for address: 00000000000f41c9 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P RIP: 0010:__hrtimer_run_queues+0x106/0x230 Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is at the 6th byte of the above CS CALL instruction. Since the CS CALL instruction occupies 6 bytes, the exception occurred in the middle of that call instruction. The root cause is that when using eBPF tools to probe in the middle of a function, a kprobe with INT3 is used as the underlying implementation. During single-step emulation of the original CALL instruction, int3_emulate_call() assumes that the probed CALL instruction is 5 bytes long. However, the actual CS-prefixed CALL instruction occupies 6 bytes, so it constructs an incorrect
CVE-2026-98273
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98273
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6256e668b7af9d81472e03c6a171630c08f8858a",
"lessThan": "cfc1af3d054aaabee08f1f77c441b3533b082869",
"versionType": "git"
},
{
"status": "affected",
"version": "6256e668b7af9d81472e03c6a171630c08f8858a",
"lessThan": "d8c6a18c0552135cbf0c696c9019b2979d0862c9",
"versionType": "git"
},
{
"status": "affected",
"version": "6256e668b7af9d81472e03c6a171630c08f8858a",
"lessThan": "a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255",
"versionType": "git"
},
{
"status": "affected",
"version": "ba7d1dae9fe866abe74bb1e849fb85983b7c4c37",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.190",
"lessThan": "5.11",
"versionType": "semver"
}
],
"programFiles": [
"arch/x86/include/asm/text-patching.h",
"arch/x86/kernel/alternative.c",
"arch/x86/kernel/kprobes/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/include/asm/text-patching.h",
"arch/x86/kernel/alternative.c",
"arch/x86/kernel/kprobes/core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98273
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38351 · Revision 1
- Added to Heist Feed
- Publisher date