CVE-2023-52504
x86/alternatives: Disable KASAN in apply_alternatives()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ]
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.28% · top 80% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Weakness
Affected products
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < 3719d3c36aa853d5a2401af9f8d6b116c91ad5ae
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < 3770c38cd6a60494da29ac2da73ff8156440a2d1
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < 6788b10620ca6e98575d1e06e72a8974aad7657e
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < ecba5afe86f30605eb9dfb7f265a8de0218d4cfc
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < 5b784489c8158518bf7a466bb3cc045b0fb66b4b
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < cd287cc208dfe6bd6da98e7f88e723209242c9b4
- affected 6657fca06e3ffab8d0b3f9d8b397f5ee498952d7 – < d35652a5fc9944784f6f50a5c979518ff8dacf61
- affected 4.17
- unaffected < 4.17
- unaffected 4.19.297 – ≤ 4.19.*
- unaffected 5.4.270 – ≤ 5.4.*
- unaffected 5.10.199 – ≤ 5.10.*
- unaffected 5.15.136 – ≤ 5.15.*
- unaffected 6.1.59 – ≤ 6.1.*
- unaffected 6.5.8 – ≤ 6.5.*
- unaffected 6.6 – ≤ *
References (7)
- https://git.kernel.org/stable/c/3719d3c36aa853d5a2401af9f8d6b116c91ad5ae (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/3770c38cd6a60494da29ac2da73ff8156440a2d1 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/6788b10620ca6e98575d1e06e72a8974aad7657e (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/ecba5afe86f30605eb9dfb7f265a8de0218d4cfc (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/5b784489c8158518bf7a466bb3cc045b0fb66b4b (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/cd287cc208dfe6bd6da98e7f88e723209242c9b4 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/d35652a5fc9944784f6f50a5c979518ff8dacf61 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-52504)Record last updated .