CVE-2021-46928
published 2024-02-27CVE-2021-46928: In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Instruction…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.22%
13.2th percentile
In the Linux kernel, the following vulnerability has been resolved:
parisc: Clear stale IIR value on instruction access rights trap
When a trap 7 (Instruction access rights) occurs, this means the CPU
couldn't execute an instruction due to missing execute permissions on
the memory region. In this case it seems the CPU didn't even fetched
the instruction from memory and thus did not store it in the cr19 (IIR)
register before calling the trap handler. So, the trap handler will find
some random old stale value in cr19.
This patch simply overwrites the stale IIR value with a constant magic
"bad food" value (0xbaadf00d), in the hope people don't start to try to
understand the various random IIR values in trap 7 dumps.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.15.15-1 (bookworm) | linux 5.15.15-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d01e9ce1af6116f812491d3d3873d204f10ae0b8 | d01e9ce1af6116f812491d3d3873d204f10ae0b8 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e96373f0a5f484bc1e193f9951dcb3adf24bf3f7 | e96373f0a5f484bc1e193f9951dcb3adf24bf3f7 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 484730e5862f6b872dca13840bed40fd7c60fa26 | 484730e5862f6b872dca13840bed40fd7c60fa26 |
| linux | linux_kernel | < 5.10.90 | 5.10.90 |
| linux | linux_kernel | >= 0 < 5.10.92-1 | 5.10.92-1 |
| linux | linux_kernel | >= 0 < 5.15.15-1 | 5.15.15-1 |
| linux | linux_kernel | >= 0 < 5.15.15-1 | 5.15.15-1 |
| linux | linux_kernel | >= 0 < 5.15.15-1 | 5.15.15-1 |
| linux | linux_kernel | >= 5.11.0 < 5.15.13 | 5.15.13 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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Red Hat
kernel: parisc: Clear stale IIR value on instruction access rights trap
vendor_redhat·2024-02-27·CVSS 5.5
CVE-2021-46928 [MEDIUM] CWE-274 kernel: parisc: Clear stale IIR value on instruction access rights trap
kernel: parisc: Clear stale IIR value on instruction access rights trap
In the Linux kernel, the following vulnerability has been resolved:
parisc: Clear stale IIR value on instruction access rights trap
When a trap 7 (Instruction access rights) occurs, this means the CPU
couldn't execute an instruction due to missing execute permissions on
the memory region. In this case it seems the CPU didn't even fetched
the instruction from memory and thus did not store it in the cr19 (IIR)
register before calling the trap handler. So, the trap handler will find
some random old stale value in cr19.
This patch simply overwrites the stale IIR value with a constant magic
"bad food" value (0xbaadf00d), in the hope people don't start to try to
understand the various random IIR values in trap 7 dumps.
Pac
Debian
CVE-2021-46928: linux - In the Linux kernel, the following vulnerability has been resolved: parisc: Cle...
vendor_debian·2021·CVSS 5.5
CVE-2021-46928 [MEDIUM] CVE-2021-46928: linux - In the Linux kernel, the following vulnerability has been resolved: parisc: Cle...
In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Instruction access rights) occurs, this means the CPU couldn't execute an instruction due to missing execute permissions on the memory region. In this case it seems the CPU didn't even fetched the instruction from memory and thus did not store it in the cr19 (IIR) register before calling the trap handler. So, the trap handler will find some random old stale value in cr19. This patch simply overwrites the stale IIR value with a constant magic "bad food" value (0xbaadf00d), in the hope people don't start to try to understand the various random IIR values in trap 7 dumps.
Scope: local
bookworm: resolved (fixed in 5.15.15-1)
bullseye: resolved (fixe
GHSA
GHSA-cj4f-m7fj-58gv: In the Linux kernel, the following vulnerability has been resolved:
parisc: Clear stale IIR value on instruction access rights trap
When a trap 7 (I
ghsa_unreviewed·2024-02-27
CVE-2021-46928 [MEDIUM] CWE-755 GHSA-cj4f-m7fj-58gv: In the Linux kernel, the following vulnerability has been resolved:
parisc: Clear stale IIR value on instruction access rights trap
When a trap 7 (I
In the Linux kernel, the following vulnerability has been resolved:
parisc: Clear stale IIR value on instruction access rights trap
When a trap 7 (Instruction access rights) occurs, this means the CPU
couldn't execute an instruction due to missing execute permissions on
the memory region. In this case it seems the CPU didn't even fetched
the instruction from memory and thus did not store it in the cr19 (IIR)
register before calling the trap handler. So, the trap handler will find
some random old stale value in cr19.
This patch simply overwrites the stale IIR value with a constant magic
"bad food" value (0xbaadf00d), in the hope people don't start to try to
understand the various random IIR values in trap 7 dumps.
OSV
CVE-2021-46928: In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Ins
osv·2024-02-27·CVSS 5.5
CVE-2021-46928 [MEDIUM] CVE-2021-46928: In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Ins
In the Linux kernel, the following vulnerability has been resolved: parisc: Clear stale IIR value on instruction access rights trap When a trap 7 (Instruction access rights) occurs, this means the CPU couldn't execute an instruction due to missing execute permissions on the memory region. In this case it seems the CPU didn't even fetched the instruction from memory and thus did not store it in the cr19 (IIR) register before calling the trap handler. So, the trap handler will find some random old stale value in cr19. This patch simply overwrites the stale IIR value with a constant magic "bad food" value (0xbaadf00d), in the hope people don't start to try to understand the various random IIR values in trap 7 dumps.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/484730e5862f6b872dca13840bed40fd7c60fa26https://git.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8https://git.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7https://git.kernel.org/stable/c/484730e5862f6b872dca13840bed40fd7c60fa26https://git.kernel.org/stable/c/d01e9ce1af6116f812491d3d3873d204f10ae0b8https://git.kernel.org/stable/c/e96373f0a5f484bc1e193f9951dcb3adf24bf3f7
2024-02-27
Published