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NVD / CVE Program· CNA Linux

CVE-2025-37991: parisc: Fix double SIGFPE crash

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6, 6a098c51d18ec99485668da44294565c43dbc106, 6c639af49e9e5615a8395981eaf5943fb40acd6f.

Low priority for now. Upgrade to Linux Linux 2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6, 6a098c51d18ec99485668da44294565c43dbc106, 6c639af49e9e5615a8395981eaf5943fb40acd6f or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: parisc: Fix double SIGFPE crash Camm noticed that on parisc a SIGFPE exception will crash an application with a second SIGFPE in the signal handler. Dave analyzed it, and it happens because glibc uses a double-word floating-point store to atomically update function descriptors. As a result of lazy binding, we hit a floating-point store in fpe_func almost immediately. When the T bit is set, an assist exception trap occurs when when the co-processor encounters *any* floating-point instruction except for a double store of register %fr0. The latter cancels all pending traps. Let's fix this by clearing the Trap (T) bit in the FP status register before returning to the signal handler in userspace. The issue can be reproduced with this test program: root@parisc:~# cat fpe.c static void fpe_func(int sig, siginfo_t *i, void *v) { sigset_t set; sigemptyset(&set); sigaddset(&set, SIGFPE); sigprocmask(SIG_UNBLOCK, &set, NULL); printf("GOT signal %d with si_code %ld\n", sig, i->si_code); } int main() { struct sigaction action = { .sa_sigaction = fpe_func, .sa_flags = SA_RESTART|SA_SIGINFO }; sigaction(SIGFPE, &action, 0); feenableexcept(FE_OVERFLOW); return printf("%lf\n",1.7976931348623158E308*1.7976931348623158E308); } root@parisc:~# gcc fpe.c -lm root@parisc:~# ./a.out Floating point exception root@parisc:~# strace -f ./a.out execve("./a.out", ["./a.out"], 0xf9ac7034 /* 20 vars */) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0 ... rt_sigaction(SIGFPE, {sa_handler=0x1110a, sa_mask=[], sa_flags=SA_RESTART|SA_SIGINFO}, NULL, 8) = 0 --- SIGFPE {si_signo=SIGFPE, si_code=FPE_FLTOVF, si_addr=0x1078f} --- --- SIGFPE {si_signo=SIGFPE, si_code=FPE_FLTOVF, si_addr=0xf8f21237} --- +++ killed by SIGFPE +++ Floating point exception

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 20, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.238
  • linux linux kernel5.11 and later · before 5.15.182
  • linux linux kernel5.16 and later · before 6.1.138
  • linux linux kernelbefore 5.4.294
  • linux linux kernel6.7 and later · before 6.12.28
  • linux linux kernel6.13 and later · before 6.14.6
  • linux linux kernel6.2 and later · before 6.6.90
  • linux linux kernel6.15

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 757ba4d17b868482837c566cfefca59e2296c608affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ec4584495868bd465fe60a3f771915c0e7ce7951affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6c639af49e9e5615a8395981eaf5943fb40acd6faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6a098c51d18ec99485668da44294565c43dbc106affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cf21e890f56b7d0038ddaf25224e4f4c69ecd143affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before df3592e493d7f29bae4ffde9a9325de50ddf962eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before de3629baf5a33af1919dec7136d643b0662e85efaffected · git
    • before 2.6.12not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.140-16.1.140-1
Debian:13linuxbefore 6.12.29-16.12.29-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-37989May 20, 2025 · net: phy: leds: fix memory leak
    22Monitor
  • ← EarlierCVE-2025-37990May 20, 2025 · wifi: brcm80211: fmac: Add error handling for brcmf_usb_dl_writeimage()
    22Monitor
  • Later →CVE-2025-37906May 20, 2025 · ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2a1aff3616b3b57aa4a5f8a7762cce1e82493fe6Vendor (CNA)
Linux Linux6a098c51d18ec99485668da44294565c43dbc106Vendor (CNA)
Linux Linux6c639af49e9e5615a8395981eaf5943fb40acd6fVendor (CNA)
Linux Linux757ba4d17b868482837c566cfefca59e2296c608Vendor (CNA)
Linux Linuxcf21e890f56b7d0038ddaf25224e4f4c69ecd143Vendor (CNA)
Linux Linuxde3629baf5a33af1919dec7136d643b0662e85efVendor (CNA)
Linux Linuxdf3592e493d7f29bae4ffde9a9325de50ddf962eVendor (CNA)
Linux Linuxec4584495868bd465fe60a3f771915c0e7ce7951Vendor (CNA)
debian:linux6.1.140-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-31608339 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
    39Monitor
  • CVE-2026-31609339 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
    39Monitor
  • CVE-2026-43011346 days apartnet/x25: Fix potential double free of skb
    39Monitor
  • CVE-2026-43414353 days apartscsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • CVE-2026-52993400 days aparttipc: fix double-free in tipc_buf_append()
    39Monitor
  • CVE-2026-63888425 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records