CVE-2026-53343ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ARM: 9475/1: entry: use byte load for KASAN VMAP stack shadow Commit 44e9a3bb76e5 ("ARM: 9430/1: entry: Do a dummy read from VMAP shadow") added a dummy read from the KASAN VMAP stack shadow in __switch_to(). The read uses ldr, but the KASAN shadow address is byte-granular and is not guaranteed to be word aligned. ARMv5 faults unaligned word loads. With CONFIG_KASAN_VMALLOC and CONFIG_VMAP_STACK enabled, ARM926/VersatilePB crashes in __switch_to() with an alignment exception before reaching init. Use ldrb for the dummy shadow access. The code only needs to fault in the shadow mapping if the stack shadow is missing, so a byte load is sufficient and matches the granularity of KASAN shadow memory.
Timeline
ID reserved
By Linux
- 22 days later
· 22 days later
Published
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 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 98% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8fe148d39c127de3fb78dfa6da95a3608dfda454 – < c0b8c148a7754826156993ed6442d31536ec86b4
- affected ef21187c0672a2b2cbec44f33bab9ec47d5c277c – < c2e3aadc8fef7da068490597fc5582f8f362aeb2
- affected c86d26b4b089ca294b3b7d915a7da61edb77935f – < c74990828d3c486ee44aaa68240eb3abff289d1c
- affected 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 – < 517720913bd3c17a52cd55a740064f68455ab88e
- affected 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 – < 2a4dc9a0ac3326e79fb58fdaae724b92127709a9
- affected 44e9a3bb76e5f2eecd374c8176b2c5163c8bb2e2 – < 77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6
- affected 6.1.120 – < 6.1.176
- affected 6.6.64 – < 6.6.143
- affected 6.12.4 – < 6.12.94
- affected 6.13
- unaffected < 6.13
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.36 – ≤ 6.18.*
- unaffected 7.0.13 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References6
- https://git.kernel.org/stable/c/c0b8c148a7754826156993ed6442d31536ec86b4 (opens in a new tab)
- https://git.kernel.org/stable/c/c2e3aadc8fef7da068490597fc5582f8f362aeb2 (opens in a new tab)
- https://git.kernel.org/stable/c/c74990828d3c486ee44aaa68240eb3abff289d1c (opens in a new tab)
- https://git.kernel.org/stable/c/517720913bd3c17a52cd55a740064f68455ab88e (opens in a new tab)
- https://git.kernel.org/stable/c/2a4dc9a0ac3326e79fb58fdaae724b92127709a9 (opens in a new tab)
- https://git.kernel.org/stable/c/77a1f6883dc6e837bb2cb30b9b02e2f94338e2c6 (opens in a new tab)
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)
- EUVD EUVD-2026-40977 (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://cveledger.app/cve/CVE-2026-53343)Record last updated .