CVE-2026-89923
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
KVM: s390: Free guest debug data on vcpu destroy
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Free guest debug data on vcpu destroy kvm_s390_clear_bp_data() is only called from kvm_arch_vcpu_ioctl_set_guest_debug(), i.e. when user space changes or disables debugging. A vCPU that is destroyed while hardware breakpoints are still armed - the normal case when the VMM just exits or crashes - leaks hw_bp_info, hw_wp_info and all old_data buffers, since generic KVM frees the vCPU right after kvm_arch_vcpu_destroy(). That is bounded by MAX_BP_COUNT entries, so roughly 8 KiB per vCPU, but it is unbounded over VM lifetimes. The allocations are GFP_KERNEL_ACCOUNT, so the charge also outlives the exiting process and pins dying memcgs. Fix by clearing the debug data on vCPU destruction. Calling it unconditionally is fine: struct kvm_vcpu is zero allocated, so for a vCPU that never enabled debugging the counters are 0 and the pointers NULL.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | 053f2068cf9b0654b651fed5ad7649d3deb982bf | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | 6c996b12bbe4a6023076e8eee3cfaf2cc99db76c | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | d6280fc540d8f4653c9b54a78cb747e128070f5e | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | 544a5a665019cef394ce8bda97fa7a2cab253781 | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | 9a32c4c6a6c23b7f5bf765eb5b83ba7f64a8ec63 | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | b5acacfdb8966abff91836c1c5bd7da59d8a526e | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | e4d8b7f176b976474e0800ba71ee2dfa3ce263c9 | Unavailable | None listed |
| 27291e2165b6de70c476b7b675308113edd69a60 | affected | git | e7f698b09d4a7c36b299acf680fc50fe868e2bcd | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.16 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.16 | Unavailable | None listed |
| 5.10.270 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.221 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.188 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.110 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.51 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.5 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |